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,.J. •' .. ...... ...... .... . . , . -. : ,.. ";">.....' . . · .. ,., .., . .. . . . . . ····" .·:.:. . Boat Reversing Gearbox Units .· .:.·...· . . . Installation -O..>eration Maintenanc·e-Assembly Repair-Spar.. Parts List for HBW5/HBW1 O/HBW20 2.12.2 Table of contents 1. Description 1 .1 Brief description 1.2 Technical data and main dimensions 1.2.1 HBW 5 boat reversing gearbox unit 1.2.2 HBW 10 boat reversing gearbox unit 1.2.3 HBW 20 boat reversing gearbox unit 1 .3 Gear casing 1.4 Gear set 1.5 Multiple-disc clutch incl operation 1.6 Shaft bearings 1.7 Shaft seals 1.8 Lubrication 1 .9 Cooling unit Installation Delivery condition Transport Removal of preservative Painting the gearbox 2.4 2.5 Connection of gearbox with engine 2.6 Connection of gearbox with propeller 2.7 Suspension of engine-gearbox assembly in the boat 2.8 Position of gearbox in the boat 2.9 Operation of gearbox 2.10 2.11 Cooling unit 3. Engine-gearbox compartment Operation General information Initial operation Operating temperature Operation of gearbox 3.4 3.5 Operation without load Lay-up periods 3.7 Preparation for re-use 4. Maintenance 4.1 Transmission oil 4.2 Oil quantity 4.3 Oil level checks 4.4 Oil change 4.5 Checking the Bowden cable or rod linkage ···--.---.. Cooling unit 5. Disassembly 5.1 Removing the cooling unit 5.2 Removing and disassembling the actuating lever cover plate 5.3 Removing the bearing shields 5.4 Separating the gearbox sections and removing the input and output shafts 5.5 Removing the shifting fork 5.6 Removing the intermediate gear 5.7 Disassembling the input shaft 5.8 Disassembling the output shaft 6. Reassembly 6.1 General information 6.2 Pre-assembling the intermediate gear shaft in the gearbox section without opening 6.3 Pre-assembling the shifting fork in the gearbox section with opening 6.4 Pre-assembling the actuating lever cover plate 6.5 Pre-assembling the gears 6.6 Measuring the pre-assembled gears to determine setting value "a" 6.7 Pre-assembling the bearing shields 6.8 Pre-assembling the actuating members 6.9 Reassembling the input shaft 6.10 Reassembling the output shaft 6.11 Final assembly of gearbox 6.12 Measuring the gear sets of input shaft and output shaft 6.13 Mounting the actuating lever cover plate 6.14 Mounting the cooling unit 7. Spare parts Iist 8. Trouble-shooting 9. Drawings ----..------ ·.... 1. Description Brief description Technical data and main dimensions 1.2.1 HBW 5 boat reversing gearbox unit 1.2.2 HBW 10 boat reversing gearbox unit 1.2.3 HBW 20 boat reversing gearbox unit 1.3 Gear casing 1.4 Gear set 1.5 Multiple-disc clutch incl operation 1 .6 Shaft bearings 1.7 Shaft seals 1.8 Lubrication 1.9 Cooling unit 1. Description 1.1 Brief description HURTH boat reversing gearbox units of the HBW line are equipped with a posi tively driven, mechanically operated helical gearing system. The servo-operated multiple-disc clutch requires only minimum effort for gear changing, making the HBW transmission suitable for single-lever remote control via a rod linkage or Bowden cable. The HBW permits direct reversing at full engine spped, for example in emergency cases. The torque transmission capacity of the clutch is exactly rated, preventing shock loads from exceeding a predetermined value and thus ensuring maximum protection of the engine. The transmission units are characterized by low weight and small overall dimensions. The gearbox castings are made of a high-strength, corrosion-resistant aluminium alloy, chromized for improved sea water resistance and optimum adhesion of paint. A choice of gear ratios, a high efficiency rating and low-noise operation are other prominent features of the HBW gearbox units. The transmissions are immersion-lubricated. Maintenance is restricted to oil level checks (see "Maintenance", chapter 4). The shafts are supported by heavy-duty taper roller bearings and the gearbox is designed to take the axial propeller thrust (for permissible values see "Technical data", item 1.21. All transmission sizes are available for right-hand (R) and left-hand (L) rotation of the input shaft. 1.2 Technical data and main dimensions 1.2.1 HBW 5 Power diagram 43530 25 20 .. 15 :;Q.c·;:: 10 ..Q.iiiII>(!) 5 2 3 4 s 6-10' Gear input speed (1/min) The diagram is bas ed on eng ine power B to DIN 6270. A shock factor has to be taken into account for engines having less 4 cylinders. Main dimensions B Technical data Gear ratios Forward Gear A* 1.5 2.0 2.7 Revers e gear B" 1.9 1.9 1.9 Input torque Mmax 90 Nm 70Nm 50Nm PQwer input Pmax 25 kW Input speed "max 5000 1/min Propeller thrust Fmax 2000 N Weight without oil 9.5 kg Oil capacity 0.35 ltr Oil grade Automatic transmiss ion fluid (ATF), Type A • A output shaft rotating opposite to input shaft • B = output shaft rotating in same direction as input shaft 1 l 235 ±0,3 II With mounting flange 1.2 Technical data and main dimensions 1.2.2 HBW 10 Power diagram 504540 35 I ! . I 5 6-10'Gear input speed (11m in) The diagram is based on engine power B to DIN 6270. A shock factor has to be taken into account for engines having less 4 cylinders. Main dimensions Oil drain plug17mmwK1th3C/OSS flatS With mounting flang& Technical data Gear ratios Forward gear A* 1.6 2.1 2.8 Reverse gear B* 2.0 2.0 2.0 Input torque M max 140 Nm 120 Nm 90Nm Power input Pmax 45 kW Input speed "max 5000 1/min Propeller thrust Fmax 3500 N Weight without oil 13 kg Oil capacity 0.56 ltr Oil grade Automatic transmission fluid (ATF). Type A " A "' output shaft rotating opposite to input shaft " B = output shaft rotating in same direction as input shaft HOI..s spaced.. r-----91 i------207 -1 6 1.2 Technical data and main dimensions 1.2.3 HBW 20 Power diagram 7570656()55 .. 45_4.. 35c:::·: 30"' 3:g_ 25 :;;"' <.:l 20 15 . . . I I I 5 6-1()l Gear input speed (1/min) The diagram is based on engine power B to DIN 6270. A shock factor has to be takeninto account for engines having less 4 cylinders. Main dimensions Oil dra1n plug17 mmvwidth across flats B Technical data Gear ratios Forward gear A* 1.5 2.1 Reverse gear B" 2.1 2.1 Input torque Mmax 200 Nm 200 Nm 150Nm Power input Pmax 75 kW Input speed nmax 5000 1/min Propeller thrust Fmax 6000 N Weight without oil 18 kgOil capacity 0.751 Oil grade Automatic transmission fluid (ATF), Type A * A output shaft rotating opposite to input shaft • 8 "' output shaft rotating in same direction as input shaft ; 10n.5 A r-110...---; I; ;I . With mounting flange 1.3 Gear casing The rotating parts of the HBW transmission are accomodated in an oil-tight casing divided into two halves in the plane of the vertical axis. Amply dimensioned cooling ribs ensure good heat dissipation and mechanical rigidity. An oil filler screw with dipstick and an oil drain plug are screwed into the gear casing. The filler screw is provided with a breather hole. The shaft for actuating the multiple-disc clutch extends through a cover on the side of the gear casing. Tapped holes (see "Main dimensions", item 1.2) are provided on the face sides for bolting the transmission to a flywheel housing or an adaptor flange. All parts of the gear casing are chromized. 1 .4 Gear sets The transmission is equipped with shaved, casehardened helical gears made of forged low-carbon alloy steel. The multi-spline driving shaft connecting the transmission with the engine is hardened as well. , The driven shaft (propeller side) of the transmission is fitted with a forged coupling flange. The direction of rotation of the input shaft is governed by the clutch system, but all HBW transmission units are available for clockwise (A= right hand) or counterclockwise (L = left-hand) rotation. ......-:.. '":!..:.......:..-:-.·..·:...(... ...···· -....·::·.:·-·..--...:_ .. _ · :·..-- . .'I l, ..' ., : · . ··:. . - ,.· 1.5 Multiple-disc clutch including operation -power train The engine torque is applied to the input shaft (36) in the specified direction of rotation and, in shifting position A (see item 1.2). via gear (44). the frictionally engaged clutch discs (51 and 52) to the external disc carrier (57) and from there via the guide sleeve (59) to the output shaft (66). In shifting position B (see item 1.2). the torque is transmitted from the input shaft (36} via intermediate gear (26), gear (65}, clutch discs (51 and 52) to the external disc carrier (57), the guide sleeve (59) and the output shaft (66). -Function The transmission uses a positively driven, mechanically operated multiple-disc clutch system mounted on the output shaft. The thrust force required for obtaining positive frictional engagement between the clutch discs is provided by a servo system. This essentially comprises a number of balls which, by the rotary movement of the external disc carrier, are urged against inclined surfaces provided in pockets between the guide sleeve and the external disc carrier and in this manner exert axial pressure. The thrust force and, as a result, the transmittable friction torque are thus proportional to the input torque applied. Due to the cup springs (48) supporting the clutch disc stack and a limita· tion of the range of axial travel of the external disc carrier (57}, the thrust force cannot exceed a predetermined value, so that the torque transmission capacity of the clutch is limited. The actuating sleeve (60) is held in the middle position by spring-loaded pins. To initiate the shifting operation, the actuating sleeve (60) need merely be displaced axially by a shifting fork until the arresting force has been overcome. Then the actuating sleeve (60) is moved automatically by the spring-loaded pins, while the external disc carrier, which follows this movement, is rotated by the frictional forces exerted by the clutch discs, and the shifting operation is completed as de· scribed above. Input ----..--- i I1.5 LJ.J, .:..1.8 59 I\III\...66 1.6 Sh aft bearings Both the input and the output shafts are carried in amply dimensioned taper roller bearings . The propeller thrust can be absorbed by the bearings (for permissible values see "Technical data", item 1.2) The intermediate gear and the movable gears are carried in sturdy needle roller bearings. 1.7 Shaft seals External sealing of the input and output shafts is provided by radial sealing rings. The running surfaces on the shafts are casehardened. 1.8 Lubrication The transmissions are immersion-lubricated. The bearings are generously supplied with splash oil and oil mist. 1.9 Cooling unit Transmissions intended for use at high ambient temperatures and for continuous operation at high power (especially when shifting position 8 is used for the main direction of movement of the craft), can optionally be supplied with a cooling unit (see item 2.10). 2. 2.2 Installation Delivery condition Transport 2.3 Removal of preservative 2.4 Painting the gearbox 2.5 Connection of gearbox with engine 2.6 Connection of gearbox with propeller Suspension of engine-gearbox assembly in the boat 2.8 Position of gearbox in the boat 2.9 Operation of gearbox 2.10 2.11 Cooling unit Engine-gearbox compartment 2. Installation 2.1 Delivery condition HU RTH HBW gearbox units leave the factory in fully assembled condition. For safety reasons, the gearbox is not filled with oil for shipment. The actuating lever is mounted on the actuating shaft. On request, the gearbox is delivered with the cooling unit attached (see item 2.10). The multi-spline shaft end on the engine side is provided with an oil film and protected by a plastic cap. The bright surfaces of the coupling flange on the output side are coated with an anticorrosive agent for shipment and storage. The casi ng is chromized. Before leaving the factory, each transmission is subjected to a test run with the prescribed ATF oil. The residual oil remaining in the transmission after draining acts as a preservative and provides reliable protection against corrosion for at least 1 year if the units are properly stored. 2.2 Transport Care should be taken when transporting the gearbox or the engine-gearbox assembly to prevent undue shocks and impacts. This applies particularly to the input and output shafts. 2.3 Removal of preservative Use a suitable solvent (e.g. diluent for cellulose lacquers) for removing the anticorrosive agent, but never emery cloth or paper, since otherwise the sealing elements might be damaged. It is at advisable, especially after long periods of storage, to flush the transmission with the prescribed oil and remove the residual oil from the test run. 2.4 Painting the gearbox Before painting the gearbox, take care to remove any oil films by means of suitable agents (e.g. HST safety cleansing fluid). Always cover the running surfaces and sealing lips of the radial sealing rings on both shafts before painting. Make certain that the breather hole on the oil filler screw is not closed by the paint. Indicating plates should remain clearly legible. 2.5 Connection of gearbox with engine Insert a torsio-elastic damping plate between the engine and the transmission to compensate for minor alignment errors and protect the input shaft from external forces and loads. Radial play should be at least 0.5 mm. If the flywheel housing of the engine is of suitable design, the gearbox unit should be directly bolted to such housing by means of the tapped holes provided in the gearbox. An adapter flange is available on request for each gearbox unit (see "Main dimensions", item 1.2). The radial and axial runout values shown in the drawing below should never be exceeded between the engine and transmission. The input shaft end is provided with a multi-spline or involute spline profile (for dimensions see table below). Connection of gearbox with engine Flywheel housing Flywheel IX-·..· J ·-X Gearbox size HBW5 HBW 10 HBW20 Damper plate In ut shaft Permissible radial and axial runout X: B = 0.1 mm X: K = 0.1 mm X :P = 0.1 mm Multi·spline or involute spline Multi-spline or involute spline profile of shaft profile of hub Similar to B10x23x29 DIN 5464 A1 Ox23x29 DIN 5464 B10x23x29 DIN 5464 A 10x23x29 DIN 5464 SAE 20/24-26 teeth SAE 20/40 -26 teeth 2.6 Connection of gearbox with propeller Provision should be made for a flexible connection between the gearbox and the propeller shaft, in order to compensate for angular deflections and permit the transmission of thrust forces. The installation of a special propeller thrust bearing is not required, since the propeller thrust will be taken by the transmission bear ing. However, the output shaft should be protected from additional loads. Special care should be taken to prevent torsional vibration. When using a universal joint shaft, make certain to observe the manufacturer's instructions. 2.7 Suspension of engine-gearbox assembly in the boat To protect the gearbox from detrimental stresses and loads, provision should be made for elastic suspension of the engine-gearbox assembly in the boat or craft. The oil drain plug of the gearbox should be conveniently accessible. 2.8 Position of gearbox in the boat The inclination of the gearbox unit in the direction of the shafts should not permanemly exceed an angle of 20 degrees (see illustration). The gearbox can also be mounted with the output shaft in the upward position. Interchange the oil dipstick and the oil drain plug in this case. 2.9 Operation of gearbox Gear changing requires only minimum effort. The gearbox is suitable for single lever remote control. Upon loosening the retaining screw, the actuating lever (see illustration) can be moved to any position required for the control elements (cable or rod linkage}. Make certain that the lever does not contact the actuating lever cover plate (9): the minimum distance between lever and cover should be 0.5 mm. The control cable or rod should be arranged at right angles to the actuating lever in the neutral position of the lever. The shifting travel, as measured at the pivot point of the actuating lever, between the neutral position and end positions A and B should be at least 35 mm for the outer and 30 mm for the inner pivot point. A larger amount of lever travel is in no way detrimetal. However, if the lever travel is shorter, proper gear engagement might be impeded which, in turn, would mean premature wear, excessive heat generation and resulting damage. Clamping screw to be tightened to torque of 18 Nm Oil dipstick and oil filler screw 17 mm width across flats ..: . ' .., t..': .. ·:.:··:· •'I . . .. ·'......:-..!. -.. .. ......·.-...... '-: ... ,, 0 Minimum shifting movement for Bowden cable Oil drain Min. distance of actuating lever 0.5 mm The position of the cover plate underneath the actuating lever is factory-adjusted to ensure equal lever travel from neutral position to A and B. If this cover is removed in exceptional cases, proceed as described unter item 6.13 of this manual. When installing the gearbox, make certain that shifting is not impeded e.g. by restricted movability of the Bowden cable or rod linkage, by unsuitably positioned guide sheaves, too small bending radius, etc. ·-·--··- 2.10 Cooling unit The arrangement of the cooling unit for the HBW 10 and HBW 20 (no cooling is required for H BW 5) can be seen from the following drawings. L Cooling water drain plug L Cooling unit 17 mm width across flats The table below shows the maximum power output in continuous operation (lever positions A and B) usable without cooling. When these values are exceeded, a cool· ing unit is required. Max. engine power (kW) usable without cooling in continuous operation Lever position HBW5 HBW 10 HBW 20 A no cooling no cooling 40 B no cooling 30 always with cooling unit In case of doubt please contact the transmission manufacturer. \ 2.9 Operation of gearbox Gear changing requires only minimum effort. The gearbox is suitable for single lever remote control. Upon loosening the retaining screw, the actuating lever (see illustration) can be moved to any position required for the control elements (cable or rod linkage). Make certain that the lever does not contact the actuating lever cover plate (9): the minimum distance between lever and cover should be 0.5 mm. The control cable or rod should be arranged at right angles to the actuating lever in the neutral position of the lever. The shifting travel, as measured at the pivot point of the actuating lever, between the neutral position and end positions A and 8 should be at least 35 mm for the outer and 30 mm for the inner pivot point. A larger amount of lever travel is in no way detrimetal. However, if the lever travel is shorter, proper gear engagement might be impeded which, in turn, would mean premature wear, excessive heat generation and resulting damage. Clamping screw to be tightened to torque of 18 Nm Oil dipstick and oil filler screw 17 mm width across flats 0 Minimum shifting movement for Bowden cable Oil drain plug Min. distance of actuating lever 0.5 mm The position of the cover plate underneath the actuating lever is factory-adjusted to ensure equal lever travel from neutral position to A and B. If this cover is removed in exceptional cases, proceed as described unter item 6.13 of this manual. When installing the gearbox, make certain that shifting is not impeded e.g. by restricted movability of the Bowden cable or rod linkage, by unsuitably positioned guide sheaves, too small bending radius, etc. ····--··- 2.10 Cooling unit, cont'd The cooling unit should be connected to the fresh-water pressure line (external circuit) of the engine in accordance with the diagram shown below. The minimum volume of flow is 10 ltr/min. Retrofitting of the cooling unit involves no problems (see item 6.14). Engine HBW gearbox unit 2.11 Engine-gearbox compartment Engine heat exchanger Sea-water pump Care should be taken that the engine-gearbox compartment is properly ventilated. ......... •---.L-II -.a. 3. Operation 3.1 General information 3.2 Initial operation 3.3 Operating temperature 3.4 Operation .of gearbox 3.5 Operation without load 3.6 Lay-up periods 3.7 Preparation for re-use 3. Operation 3.1 General information All HBW boat reversing gearbox units are test-run on a test stand at the factory prior to delivery. For safety reasons the oil is drained before shipment. 3.2 Initial operation Fill the gearbox with oil of the recommended grade (see items 4.1 and 4.2). The oil level should be the index mark on the dipstick (see illustration). Casing surface Oil level Correct readings up to 20 ° inclination in direction of shafts Dipstick To check the oil level, just insert the dipstick, do not screw in. Retighten the hex screw with the dipstick after the oil level check. 3.3 Operating temperature The max. permissible temperature of the transmission oil is 130 oc.3.4 Operation of gearbox Shifting is initiated by a cable or rod linkage via the actuating lever and an actuating cam. The completion of the gear changing operation is automatic and cannot be influenced by external control. The actuating lever is mounted on an actuating shaft and fixed by means of a retaining screw. Gear changing should be smooth, not too slow, and continuous (without inter· ruption). The multiple-disc clutch permits gear changing at high engine rpm, including sudden reversing at top speeds in the event of danger. 3.5 Operation without load Rotation of the propeller without load, e.g. while the boat is sailing, being towed, or anchored in a river, as well as idling of the engine with the propeller stopped, will have no detrimental effects on the gearbox. Locking of the propeller shaft by an additional brake is not required, since locking is possible by engaging the reverse gear. 3.6 Lay-up periods If the transmission is not used for periods of more than 1 year it should be completely filled with oil of the same grade to prevent corrosion. Protect the input shaft and the output flange by means of an anticorrosive coating if required. 3.7 Preparation for re-use See item 2.3 -··----- 4. Maintenance 4.1 Transmission oil 4.2 Oil quantity 4.3 Oil level checks 4.4 Oil change 4.5 Checking the Bowden cable or rod linkage 4.6 Cooling unit 4. Maintenance 4.1 Transmission oil To ensure trouble-free operation of the clutch, only use oil of the recommended type. Under no circumstances should the oil contain any additives such as molybdenum sulphite. We recommend commercial Automatic Transmission Fluid (ATF), Type A. 4.2 Oil quantity H BW 5 approx 0.4 ltr HBW 10 approx 0.6 ltr H BW 20 approx 0.8 ltr Use the index mark on the dipstick as a reference (see item 3.2). 4.3 Oil level checks Check the oil level in the gearbox about once a month. Correct oil level: index mark on dipstick (see item 3.2). Always use the same oil grade when topping up. 4.4 Oil change Change the oil for the first time after about 25 hours of operation, then at intervals of at least 1 year. 4.5 Checking the Bowden cable or rod linkage The Bowden cable or rod linkage should be checked at shorter time intervals. The minimum lever travel from the neutral position to operating positions (0-A = 0-B) should be 35 mm for the outer and 30 mm for the inner pivot point. Make certain that these minimum values are safely reached. Check the cable or rod linkage for easy movability (see item 2.9). 4.6 Cooling If the transmission is equipped with a cooling unit, drain the cooling water before long periods of non-use at temperatures around or below freezing point. For drain plug see drawing under item 2.10. 5. Disassembly 5.1 Removing the cooling unit 5.2 Removing and disassembling the actuating lever cover plate 5.3 Removing the bearing shields 5.4 Separating the gearbox sections and removing the input and output shafts 5.5 Removing the shifting fork 5.6 Removing the intermediate gear 5.7 Disassembling the input shaft 5.8 Disassembling the output shaft 5. Disassembly Note: fold out illustration 9.1 and 9.2 (exploded views) for reference. The tools and fixtures marked by thick lines in the drawings shown in the following instructions are available from HURTH. 5.1 Removing the cooling unit Unscrew 4 hex head screws m 8 x 50 and take off unit with seal (see illustration under item 6.14.2). 5.2 Removing and disassembling the actuating level cover plate 5.2.1 Always set actuating lever to neutral position. 5.2.2 Remove hex head screws (5) from cover plate (9), using 13 mm spanner (wrench), and take off spring washers (4). 5.2.3 Remove cover plate assembly (9) with seal (29), lever (6) and actuating cam ( 11). 5.2.4 Remove screw (7) from lever (6). Pull off lever (6). Remove actuating cam (11). 5.3 Removing the bearing shields 5.3.1 Remove hex head screws (5) from bearing shields (2) and (3), using 13 mm spanner (wrench), and take off spring washers (4). 5.3.2 Remove cover (3) and bearing shield (2) on input shaft (36) together with seals (28). 5.4 Separating the gearbox sections and removing the input and output shafts 5.4.1 Remove hex nuts (22) from gearbox ( 1), using 13 mm spanner (wrench), take off spring washers (4) and remove screws (21). 5.4.2 Separate the two halves of gearbox (1) by light hammer blows on the oil filler screw and oil drain plug ( 19) and (20). 5.4.4 Remove shims (37, 38, 39, 40) from the input and output shafts and keep separately. For proper reassembly it is advisable to note down the thickness and location of each of the shims to obtain the correct bearing play. If none of the parts (2, 3, 32, 33, 36) on the input shaft and of the parts (2, 3, 34, 35, 43, 46, 47, 59) of the output shaft are replaced, the shims can be re-used in the same positions. Should any of these parts be replaced, the dimensions of the gear set relative to the casing have to be measured anew and suitable shims have to be installed. 5.5 Removing the shifting fork (15) 5.5.1 Remove screw plug (17). 5.5.2 Pull actuating shaft ( 16) out of bearing. 5.5.3 Remove shifting fork ( 15). 5.6 Removing the intermediate gear (26) 5.6.1 Heat gearbox section with intermediate gear to a temperature of approx. 80 ° C. 5.6.2 Knock pin (24) out of its bearing by light hammer blows, using a driving pin of suitable size. 5.6.3 Remove intermediate gear (26), retaining plates (25) and roller cage (27). 5.7 Disassembling the input shaft (36) 5.7.1 Remove outer bearing races (32). 5.7 .2 In the event of bearing damage, cautiously drive inner races (33) off the input shaft (36) with a punch (away from gear) . 5.8 Disassembling the output shaft (66) 5.8.1 Mount support rail on a vice with the pins pointing upwards. 5.8.2 Place output shaft (66) vertically on the support rail with the flange side down. 5.8.3 Remove grooved ring nut (41) by means of special socket spanner and take off spacer (42) and outer bearing race (34) . Special socket spanner 42 41 34 /66 Support rail 5.8.4 Place face side of gear (65) adjacent to shaft flange against divided flange and use pin of suitable size to press off the output shaft (from the threaded end). Flange 65 The parts removed from the threaded side of the shaft are not interchangeable with the parts removed from the flange side. Keep separately. 5.8.5 Remove keys (67) from the output shaft and keep in a separate place (2 keys for HBW 5, 1 key for HBW 10 and 4 keys for HBW 20). !I ---- 5.8.6 Attach divided flange between taper roller bearing (35) and thrust ring (43) and press off spacers (47), needle bearing inner races (46), thrust ring (43) and shims (53, 54, 55, 56) from the output shaft. Take care not to damage cages (45 and 35). 47 46 43 Flange 53, 54, 55, 56 5.8.7 Attach divided flange to face side of bearing shield (2) and pull off taper roller bearing (34, 35) with shield. Flange 66 34/35 ·---..--- 5.8.8 Remove internal and external clutch discs from gears (44) and (65). 5.8.9 Dismantling the gears Compress cup springs (48) by means of dismantling tool. Remove circlip (50) and take off thrust plate (49). Dismantling tool 50 48 44/65 5.8.10 Dismantling the actuating members Detach springs (64), watching for balls (58). 5.8.11 Remove disc carrier (57). 5.8.12 Place actuating sleeve (60) on a plane surface and press out guide sleeve (59). Watch for detent pins and springs jumping off the guide sleeve. It will be advisible to wrap a rag around the actuating sleeve (60) and the guide sleeve (59) to catch any parts that might jump off. 6. Reassembly 6.1 General information 6.2 Pre-assembling the intermediate gear shaft in the gearbox section without opening 6.3 Pre-assembling the shifting fork in the gearbox section with opening 6.4 Pre-assembling the actuating lever cover plate 6.5 Pre-assembling the gears 6.6 Measuring the pre-assembled gears to determine setting value "a" 6.7 Pre-assembling the bearing shields 6.8 Pre-assembling the actuating members 6.9 Reassembling the input shaft 6.10 Reassembling the output shaft 6.11 Final assembly of gearbox 6.12 Measuring the gear sets of input shaft and output shaft 6.13 Mounting the actuating lever cover plate 6.14 Mounting the cooling unit 6. Reassembly Note: fold our illustrations 9.1 and 9.2 (exploded views) for reference. The tools and fixtures marked by thick lines in the drawings shown in the following instructions are available from HURTH. 6.1 General information The following points should be observed when reassembling the gearbox: -Clean all parts thoroughly, especially sealing surfaces, inspect for wear, damage and cracks, and replace if required. -In the event of damage on the teeth of any gears, always replace the damaged gear and its mating gear. -Check shifting fork (15) for wear. The contact surfaces of this fork are provided with a molybdenum coating. Should this coating be worn away at any point, replace the shifting fork. Max. wear on guiding surfaces 0.2 mm on each side. -Thrust rings (43) require replacement if wear exceeds 0.25 mm. -Internal discs (51) have a sintered metal coating of 0.3 mm on each side. If the surface structure (after cleaning) appear "glazed", replace the discs. -Immerse cleaned antifriction bearings in oil before installation. 6.2 Pre-assembling the intermediate gear shaft in gearbox section without opening 6.2.1 Heat gearbox section ( 1) without opening for the actuating lever to a temperature of approx. 100 °C. 6.2.2 Insert retaining plate (25) 0 Important Note that the bevelled corners of retaining plates (25) have to be placed in differ· ent positions (see illustration 9.1). 6.2.3 Insert needle cage (27) into intermediate gear (26) and place complete assembly on retaining plate (25)0 6.2.4 Insert second retaining plate (25). 6.2.5 Use a suitable pin for correct concentric alignment of all parts. 6.2.6 Fit 0-ring (23) to intermediate gear shaft (24) and insert into gearbox section. Important On HBW 20, insert intermediate gear shaft (24) without O·ring (23) and close bore in gearbox section with sealing compound by pressing in a plug (23), (see illustration 901) 0 6.3 Pre-assembling the shifting fork in gearbox section with opening 6.3.1 Insert shifting fork ( 15) into gearbox section ( 1) with opening for the actuating lever in such a way that the long arm of the fork points downwards. 6.3.2 Insert shifting rod (16) through bores in gearbox and shifting fork. 6.3.3 Fit screw plug (17) to gearbox, making certain that the clearance between shifting rod (16) and screw plug (17) is approx. 0.5 mm. Seal screw plug with sealing compound. 6.3.4 Check shifting fork for easy movability. 6.4 Pre-assembling the actuating lever cover plate Use punch tool to press sealing ring (8) into cover plate (9). Spread antifriction bearing grease between sealing lips. Punch tool 6.4.1 Insert actuating cam assembly ( 11) into cover plate (9). 6.4.2 Fit actuating lever (6). Important Clearance between actuating lever and cover plate 0.5 mm. 6.4.3 Clamp actuating lever by means of retaining screw (7), using a 13 mm spanner (wrench). ----..--- 6.5 Pre-assembling the gears (65) and (44) with cup springs (48) and clutch discs {51 and 52) Important If previously disassembled parts are used, make certain that only mating and assoCiated parts are reassembled (see item 5.8.4). 6.5.1 Join two cup springs (48) face to face (external diameters in contact} and place them on the centering collar of gears (65) and (44). 6.5.2 Place thrust ring (49) on cup springs. 6.5.3 Place circlip (50) on gear hub and use mounting tool and press to fit circlip into groove on hub. 50 49 48 44/65 6.5.4 Attach clutch discs (51 and 52), first internal disc (51), then alternatingly external disc (52), internal disc (51), etc. 6.6 Measuring the pre-assembled gears (65) and (44) to determine setting value "a" If no parts had to be replaced, the previously disassembled shims (53, 54, 55, 56) can be re-used in their former arrangement and positions without any measuring operation. If measuring is required, proceed as follows: 6.6.1 Place pre-assembled gear (65), and subsequently gear (44), on a supporting plate (end face of hub downwards, see illustration). 6.6.2 Insert needle cage (45), inner race (46) and spacer (47) into bore of gear. 6.6.3 Fit shims (53, 54, 55, 56), as required, until prescribed setting value "a" is obtained (see illustration) . I. I rL..i• ••1 r·• • I. . -·--'-- Type HBW 5 HBW1 0 HBW20 Setting value "a" 13,0 -0, 1 13,2 -0,1 16,2 -0,1 53, 54, 55, 56 50 . ... ;· 6.6.4 Shims are available in thicknesses of 0.4 -0.5 -0.6 and 0.7 mm. -··---··- 6.7 Pre-assembling the bearing shields (2} for the input and output shafts Use punch tool to press shaft sealing rings (30 · input) and (31 -output) into shield (2). Punch tool 2 6.8 Pre-assembling the actuating members 6.8.1 Fit driving pins (63), springs (61) and detent pins (22) to guide sleeve (59). 6.8.2 Place actuating sleeve (60) on press platen. 6.8.3 Place guide sleeve (59) on top of actuating sleeve (60) with the three driving pins (73) in alignment with the three grooves in the actuating sleeve. Watch for correct position of detent pins (62) relative to angular pockets of sleeve. 6.8.4 Press guide sleeve (59) into actuating sleeve (60) up to midway position (noticeable click). 6.8.5 Insert balls (58) into ball pockets of guide sleeve, attach disc carrier (57), then fit balls on opposite face side and attach second disc carrier (57). 6.8.6 Attach springs (64) with closed part of spring windings pointing outwards. 6.9 Reassembling the input shaft Preheat inner races (33) of taper roller bearings to a temperature of 100 ° C and, using tubular or punch tool, press races on input shaft (36) on both sides. Important: repress after cooling down, so that no gap is left. \\I l I IIII I I rIIl Punch tool Tubular tool 6.10 Reassembling the output shaft 6.10.1 Place pre-assembled bearing shield (item 6. 7) with seal (28) on output shaft (66). 6.10.2 Attach outer race (34) of taper roller bearing. 6.1 0.3 Pre-heat inner race (35) of taper roller bearing to a temperature of approx. 100 ° C and press on output shaft (66) in hot condition, with smaller diameter adjacent to collar on shaft. Important: repress after cooling down, so that no gap is left. 6.1 0.4 Fit thrust ring (43) in such a way that sintered surface (brown colour) faces gear. 6.10.5 Use tubular tool to press on inner race (46) of needle bearing for gear (65). Tubular tool 66 46 43 44 65 35 34 6.10.6 Attach needle cages (45) and completely pre-assembled gear (65) with cluch discs (51 and 52). 6.1 0.7 Fit spacer (47) and shims (53, 54, 55, 56) to gear (65). 6.1 0.8 Fit keys (67) to shaft (2 for HBW 5, 1 for HBW 10 and 4 for HBW 20) . 6.10.9 Press pre-assembled actuating members (see item 6.8) on output shaft (66). Important: align external clutch discs radially relative to disc carrier. 6.10.10 Attach shims (53, 54, 55, 56) to gear (44). 6.10.11 Attach spacer (47) to gear (44). 6.10.12 Use tubular tool to press on inner race (46) of needle bearing for gear (44). 6.10.13 Attach pre-assembled gear (44) with needle cage (45) and clutch discs (51 and 52). Align external discs for proper engagement with actuating member. 6.10.14 Attach thrust ring (43) in such a way that sintered surface (brown colour) faces gear. 6.10.15 Pre-heat inner race (35) of taper roller bearing to a temperature of approx. 100 °C and press on shaft, with larger diameter adjacent to thrust ring. Important: repress after cooling down, so that no gap is left. 6.10.17 Screw on grooved ring nut (41) by means of special socket spanner. Tighten to torque of 95 Nm. Special socket spanner 6.10.18 Secure ring nut by punching outer rim into groove of shaft. 6.10.19 Check gears (44) and (65) for free movability in an axial direction. 6.10.20 Attach outer race (34) of taper roller bearing. 6.1 1 Final assembly of gearbox 6.11.1 Place pre-assembled gearbox section ( 1) -(with intermediate gear) -on side wall. 6.11.2 Place pre-assembled output shaft (66) in lower part of gearbox with flange side towards intermediate gear side. 6.1 1.3 Place pre-assembled input shaft (36) in upper part of gearbox. 6.1 1.4 Spread sealing compound on sealing surface of pre-assembled gearbox section (1) (with shifting fork) and place upper section on lower section of gearbox. 6.11 .5 Insert two screws (21 ) preferably in the middle, and screw in finger-tight to secure the two gearbox sections together. 6.1 1.6 Use a rubber mallet to align the two gearbox sections ( 1) by tapping them gently into position. 6.1 1.7 Fit bearing shield (2) to output shaft (66) by means of spring washers (4) and screws (5), using a 13 mm spanner (wrench). Tighten to torque of 14 Nm. 6.11.8 Slide pre-assembled bearing shield (2) with seal {28} over input shaft and secure by means of spring washer {4) and screws (5), using a 13 mm spanner (wrench). i , 6.12 Measuring the gear sets of input shaft and output shaft (see illustration) 6. 12.1 Tap outer races (32) and (34} on output and input shafts to eliminate bearing play, simultaneously rotating the shafts. 6.12.2 Determine dimension "b" by means of depth gauge (see illustration). 6.12.3 Measure dimension "c" on cover (3) with seal (28) installed, using a depth gauge {see illustration). The difference between the two dimensions indicates the distance to be filled up with shims (37, 38, 39, 40). Shims are available in thicknesses of 0.1 -0.15 -0.2 -0.3 and 0.5 mm. with seal -··---· ;. for difference inserti g shims 137,38,39,401_.J b l Distance from set 6.1 2.4 Insert the required number of shims into the bearing bores of the gearbox to obtain an axial play of the output and input shafts of 0.05 ± 0.02 mm. If no parts had to be replaced (see item 5.4.4), the previously disassembled shims (37, 38, 39, 40) can be re-used in the previous arrangement and positions with· out measuring. 6.12.5 Mount the previously measured covers (3) on the output and input shafts by means of spring washers (4) and screws (5). using a 13 mm spanner (wrench). Tighten to torque of 14 Nm. Make certain that bearing shield (2) and cover (3) on the input side are screwed in place in such a way that the flanges are in alignment with each other at the level of the gearbox. 6.1 2.6 Place spring washers (4) underneath all screws (21) and tighten screws to a torque of 22 Nm, using a 13 mm spanner (wrench). 6.12.7 Tap output and input shafts lightly in an axial direction while rotating the shafts, to ensure freedom of movement. 6.12.8 Axial play of input and output shafts: 0.05 ± 0.02 mm, measured by means of dial indicator in contact with the end faces of the shafts (see illustration). Support . ....._,.. Axial play 0.05 ± 0.02 mm 6.13 Mounting the actuating lever cover plate 6.13.1 Place seal (29) on pre-assembled cover plate (9) and attach cover plate to gearbox. Watch for proper engagement of actuating cam and shifting fork. The cover plate can be mounted when the shiftiAg fork is in the middle (= neutral) position. It is important to adjust the actuating lever to exactly midway position in neutral. The lever travel from 0 to A and from 0 to B should be equal. After a lever travel of 28 to 31 mm the transmission should be in gear. Screw the cover plate in place in this position. 6.13.2 Fit spring washers (4) and screws (5}, using a 13 mm spanner (wrench). Tighten to a torque of 14 Nm. Check actuating lever for proper operation. 6.1 4 Mounting the cooling unit (if required) Attach the cooling unit on the side opposite the cover plate (9). 6.14.1 Tap the existing four blind holes: metric thread, 8 mm diameter, 10 mm deep. 6.14.2 Fit seal (29) and attach cooling cover by means of 4 screws M 8 x 50. IILCooling water drain plug 17 mm width across flats Cooling unit 7. Spare parts list 7. Spare parts list Note It should be noted that the attached spare parts list is based on illustrations 9.1 and 9.2 (exploded views). When placing spare parts orders please specify the following information and data: -size and model of gearbox; -serial number of gearbox; -item number with associated part number and identification number as well as name of part. · --++-- 1:1: s1: II en'a m ; 't:JI»:::1. tn --· tn ... Item Part name No 1 Gearbox assembly 2 Bearing shield input output 3 Cover Spring HBW 5 and 10 4 ----....-washer HBW 20 5 Hex head screw (cover) 6 Actuating lever 7 Hex head screw (actuating lever) 8 9 10 11 15 16 17 18 19 20 21 Radial sealing ring Cover plate Spring dowel pin -----·-y·.. ..--- Actuating cam assembly Shifting fork assembly Actuating shaft Screw plug Sealing ring .,.,._ ' ... -..-- ------ Oil dipstick/breather ass'y Oil drain plug Hex head screw -..J Spare parts list Number pergearbox 1 1 1 2 38 40 20 1 1 1 1 1 1 1 1 1 2 1 1 10 HBW 5 HBW 10 Part No ld No Part No 947.61.700.02.1 288 079 947.41.700.01.1 947.61 .004.01.4 288 768 947.41.004.01.4 947.61.003.01.4 288 787 947.61 .005,01.4 288 730 94 7 .41 .005.01 .4 88 DIN 137 159 843 88 DIN 137 Cd-plated Cd-plated M8x16 DIN 933 8.8 215 870 M8x16 DIN 933 8.8 Cd-plated Cd-plated 947.23.006.01.4 195 062 94 7 .23.006.01.4 M8x20 DIN 933 8.8 199 807 M8x20 DIN 933 8.8 Cd-plated Cd-plated SO 20 X 26 X 4 106 864 SO 20 X 26 X 4 947.41.003.01.3 206 448 94 7 .41 .003.01.3 4 x 12 DIN 1481 104 559 4 X 12 DIN 1481 947.53.703.01.4 304 332 94 7.53. 703.01.4 947.63.700.01.4 288 721 94 7.43. 700.01 .4 947.43.002.01.4 206 484 947.43.002.01.4 M16x1,5 DIN 906 5.8 215 877 M16x1,5 DIN 906 5.8 Cd-plated Cd-plated A16x20 DIN 7603/AL 227 851 A 16x20 DIN 7603/Al 947.61.701.01.4 288 729 947.41 .701.01.4 947.41.008.01.4 228 566 94 7 .41 .008.01.4 M8x90 DIN 931 8.8 215 869 M8x90 DIN 931 8.8 Cd-plated Cd-plated ld No 206 447 206 450 206 452 159 843 215 870 195 062 199 807 106 864 206 448 104 559 HBW 20 ·------·-- Part No ld No 947.51.700.02.1 (2) 947.51.004.01.4 947.51 .005.01.4 ... .. -----. 274.223 288 966 274 248 274 219 88 DIN 137 159 843 Cd-plated M8x16 DIN 933 8.8 215 870 Cd-plated 947.23.006.01.4 195 062 M8x20 DIN 933 8.8 199 807 Cd-plated SO 20 X 26 X 4 106 864 ------- 94 7.41 .003.01.3 206 448 4 X 12 DIN 1481 104 559 ···- 304 332 947.53.703.01.4 304 332 223 563 947.53.700.01.4 274 224 -----·· · 206 484 947.53.002.01.4 288 673 215 877 M16x1,5 DIN 906 5.8 215 877 Cd-plated 227 851 A16x20 DIN 7603/Al 227 851 206 929 947.51.701.01.4 274 217 228 566 947.41.008.01.4 228 566 215 869 M8x110 DIN 931 8.8 279 058 Cd·plated (1) Ratios 1.5:1 and 2:1 (2) Ratio 3:1 Item z c: No .. 22 z B 23 24 25 26 27 28 29 rn 300 »i 31 :;,» 32 33 34 35 Part name HBW 5 and 10 Hex nut HBW 20 0-ring or plug Intermediate gear shaft Retaining plate Intermediate gear Cage Seal Seal (cover plate) Radial sealing ring, input Radial sealing ring, output Taper roller bearing, input Taper roller bearing, input Taper roller bearing, output Taper roller bearing, ootput ---. ··--····-···----·· Number per gearbox 8 10 1 1 2 1 1 4 1 1 1 2 2 2 2 HBW 5 HBW 10 HBW 20 Part No ld No Part No ld No Part No ld No M8 DIN 934 5 103 876 M8 DIN 934 6 103 876 M8 DIN 934 5 103 876 Cd-plated Cd-plated Cd-plated 0 R 1 2,30-2,40-00636/59 105 679 OR 14,00-3,00-00794/09 105 530 A32 DIN 443 285 Cd-plated 947.62.006.01.4 288 741 947.42.006.D 1.4 206 470 94 7.52.006.01.4 2'74 225 947.62.009.01.4 288 743 94 7 .42.009.0 1.4 206 473 947.52.009.01.4 288 702 947.62.004.02.4 288 078 94 7 .42.004.02.4 254 730 947.52.004.01.4 274 226 DKK 16x24x20 280 128 DKK 20x30x24 215 878 KK 20x30x28 222 273 947.61.008.01.4 288 739 947.41.010.01.4 254 715 947.51.01 1.01.4 274 251 947.41.01 1.01.4 254 716 94 7 .41 .01 1.01.4 254 716 947.41.01 1.01.4 254 716 A27x37x7 Dl N 3760 AC 280 135 B30x52x7 DIN 3760 215 875 35x52x7 81 72 NBR 769 284 260 832x45x7 DIN 3760 105 153 B40x52x7 DIN 3760 105 159 B40x52x7 DIN 3760 105 159 ASRG KL 44610 280 127 ASRG K·LM 67010 215 874 32007 X DIN 720 167 210 INTL KL 44649 280 129 INTL K·LM 67048 215 873 ASRG KL 446 10 280 127 ASRG K-LM 67010 215 874 ASRG K 15245 279 059 INTL KL 44649 280 129 INTL K-LM 67048 215 873 INTL K 15123 279 061 Item I No 1: .. III 36 "C m(il 37 "C 38 m..t/1 39 -40-· t/1,... 41 42 43 Part name 1.5 R-27/22 teeth 2 R-22/22 teeth 3 R-18/22 teeth------- 2 L -27/22 teeth 1.5 R-27/22 teeth ... - "' 2 R-22/22 teeth-C "' ...:;, 3 R -18/22 teethc...: 2 L-22/22 teeth 1.5 R -28/21 teeth 2 R-23/21 teeth R-19/18 teeth 2 L-23/21 teeth Shim Shim Shim Shim Grooved ring nut Spacer Thrust ring ··-.. ___.. .., •... --· . -- -- ·-· "••··-··-- . --- . ... .. .... ···-· . ------ ....._. Spare parts· ' list Number per gearbox 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 1 2 2 HBW 5 Part No 94 7 .62.001 .05.3 947.62.001.03.3 ---·· ···-· 94 7 .62.001.06.3 947.62.001 .03.3 ...... ····--- 947.62.010.01.4 947.62.010.02.4 947.62.010.04.4 94 7.62.01 0.05.4 94 7.62.0 14.01.4 947.62.018.01 .4 947.62.01 7.01.4 ld No 304 059 288 077 304 074 288 077 ·- 288 731 288 732 288 734 288 735 288 750 288 751 288 748 HBW 10 Part No --..---·· .. . 947.42.001.03.3 ···- 94 7.42.001 .01.3 947.42.001 .02.3 947.42.001.01.3 ., ___ 947.42.010.01.4 947.42.010.03.4 947.42.010.06.4 94 7.42.01 0.05.4 94 7 .02.014.01.4 30x37x3HN 145 102 947.22.025.03.4 ld No 304 088 206 460 206 786 206 460 206 474 206 476 228 540 228 539 145 382 147 998 195 960 HBW 20 Part No . . .. --- 947.52.001.04.2 947.52.001.01.2 947.52.001 .02.2 947.52.001.03.2 947.52.010.01.4 947.52.010.02.4 94 7 .52.0 10.03.4 ---···· ---- 947.52.010.04.4 947.02.014.01.4 30x37x3 HN 145 102 965.01 .004.01.4 ld No 304 081 274 231 288 967 288 241 274 252 274 253 274 254 274 255 145 382 145 998 277 109 Item No z1: .. 1: • 44 45 46 tn 47::J » 48i ::J 49 50 51 ...... . 52 53 54 55 56 Part name Ratio 1.5 -40 teeth Ratio 2.0 -45 teeth Ratio 2. 7 -49 teeth .._Illa: Ratio 2. 7 -49 teeth Output shaft HBW 5 Key HBW 10 HBW 20 1 1 1 1 1 2 1 947.62.003.02.3 947.62.005.01.3 B8x7x 18 DIN 6885 288 084 288 749 280 130 94 7.42.003.02.3 947.42.005.02.3 947 .22.013.02.4 254 718 254 706 187 841 947.52.003.01.3 947.52.002.02.3 947.52.005.01.2 947.32.018.01.4 ---------274 240 288 969 274 239 206 121 -.... Spare parts list 8. TroubiHhooting 8. Trouble-shooting In the event of any trouble, first check whether all instructions in this installation and operating manual have been observed. The table below will, to a limited extent, assist you in finding the cause of malfunctions. To avoid the forfeiture of possible warranty claims it should be remembered that it is not permissible to do any repair or other work on the gearbox during the guarantee period. 8. Trouble-shooting In the event of any trouble, first check whether all instructions in this installation and operating manual have been observed. The table below will, to a limited extent, assist you in finding the cause of mal· functions. To avoid the forfeiture of possible warranty claims it should be remembered that it is not permissible to do any repair or other work on the gearbox during the guarantee period. 9. Drawings I 9.1 I ded view o Exp o f gearbox 6 -/$ 8 5 li9 21 I22 5 4\ I !I I5 4 1 15 16! 21 HBW 20 23 26 25 24 23 9.2 f ear set I ded view o 9Exp o 30i 33 32 57 58 59 36 \\ .. 3.., ,/ 60 1.0 39 38 37 32\ 33 /// 50 48 /' 1.7 /,/ ,/' ' 1.6 ___. .... L7 . . //..-.. _,. /,/· 55 48Sf. \ 1.9 50 52 51 / 52 ' / / / /' 52 ,/ 51 / .. · ... ·- 66 ..2 35 '-, 1.3 1978 EditiOn Fee OM 10 CARL HURTH MASCHINEN-UNO ZAHNRADFABRIK Holzstra..e. 19 POB 96 · · D-8000 Mlinch..n 5 F R Germany · Telephone (089) 23 70 21 Telex 0..29 322 · Telegrams;.Getriebehurth Munchen Moosacher StraBe 36' · POB 40 08 80 D-8000 Munchen 40 F R Germany · Catalog -Hurth 1\-larine -Page HM-15 HBW 50 thru 250 HBW 5 thru 20 , case assembljes. 23 A -s19 &.. / 23B " [Home Pagf:] [Order Form] •nde:x] Page) ·-(; 1998 Transmission Marine, Inc. Fort Lauderdale, Florida Website Design by ..rican lnternet http://www.marinegears.com/catalog/cat-hm-15.html e-mail web site comments to: 11/28/0 1 Catalog -Hurth Marine -Page HM-16 [Previous Pag..] [Home [Order .Zbrm) HBW SO tbru 250 HBW S tbro assemblies. Pllgfl) !:-1998 Transmission \Iarine., Inc. Fort Lao.., Florida Wri!Ute DosigD 11, ..rian hUei'IK1 Web Sen-.. http:I/W¥.w.rnarinegears.com/cataloglcat-hm-16.html to-mail web sitt comments to: 11128/0 1 -.. .. . .