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17   -  

PRM 60

 

9.6.2 Gearcase assembly 

 
Remove the external locknut (25) securing idler shaft (7) into gearcase (2). Remove the ten bolts (56) securing both 
gearcases (1, 2) and using a soft mallet lightly tap on the end of the input shaft (3) to separate the two gearcase (1, 2) 
halves from sealant and dowels (27). Remove the front cover (1). Withdraw the idler shaft (7) the output shaft assembly 
and the input shaft (3). 
 

9.6.3 Input Shaft 

 
Removal of the bearings (34, 38) may damage them, therefore it is good practice to replace these items if removed. 
(see 9.4.3) 
 

9.6.4 Output Shaft 

 
Carefully remove “staked” portion of locking device so as to avoid damaging the thread and remove locknut (13) from 
output shaft (14). Using a bearing puller remove the bearing (33) on the output end of the shaft (14). 
 
Remove the following: thrust washer (8), forward output gear (10) , needle bearing (37) (carefully checking for wear), 
thrust washer (9) , cone clutch (11). Using puller remove the bearing (33) on the input end of the shaft (14), thrust 
washer (8), output revese gear (12), needle bearing (37) (again carefully checking for wear), and thrust washer (9). 
Save shims for rebuild. 
Note: Removal of ball bearings may result in damage, therefore replacement will be necessary. 
 

9.6.5 Idler Shaft 

 
Remove locknut (25) and supporting gear (6) on soft material i.e. wood or similar to prevent damage to gear (6), using a 
soft mallet tap the shaft (7) through the gear (6) and remove needle bearing (4). 

Check condition of ‘O’ ring (55) on the 

idler shaft (7). 
 

9.6.6 Selector 

By hand remove selector shoe (22) and the spring (15). Remove the lever (44). Pass the selector control body (18) 
through the housing (19) 

and remove ‘O’ ring (20) and oil seal (21) if replacing them. 

 

9.6.7 Front Cover 

 
If it is required to replace the front cover (1) then it will be necessary to remove the oil seal (24). If the bearings (38, 33) 
are to be re-used then care must be taken not to damage them on removal. It is recommended to fit a new oil seal (24). 
Note: When re-fitting oil seal (24) set in 1.5mm from face as shown on page 18. 
 

9.6.8 Gearcase 

 
If it is required to replace the gearcase (2) then again if the bearings (33, 34) are to be re-used care must be taken in 
their removal. Remove output seal (40), two studs (53), dipstick (28), drain and oil level plugs (26) with bonded washers 
(31), oil filling plug (48) with bonded washer (54), and two dowels (27). 
 

9.7 Re-assembly of Gearbox 

 
(Note: coat all bearings with clean gearbox oil prior to fitting). 
 

9.7.1 Input Shaft 

 
Press the two bearings (38, 34) onto the input shaft (3) taking care to position correctly as illustrated. Make sure the 
waved washer (39) is correctly positioned into case before fitting the input shaft (3). 
 

9.7.2 Output Shaft (see 9.7.5 for Shimming procedure) 

 
All of the following components are fitted in order over the output spline end of the shaft (14). 
 
Thrust washer (9), needle bearing (37), output forward gear (10) with cone towards the scroll, thrust washer (8) and the 
bearing (33) (Press on). 
 
Fit the following components from the opposite end of the shaft (14). 
 
The cone clutch (11), thrust washer (9), needle bearing (37), output reverse gear (12) , thrust washer (8), press on 
bearing(33) (re-shim if components have been changed) (see 9.7.5). Fit lockwasher (35) and locknut (13). 

 

CAUTION: 

Remember to tighten locknuts to recommended torque. 

(SEE TORQUE CHART 10.2)

 

 

Summary of Contents for PRM 60

Page 1: ...PRM 60 WORKSHOP MANUAL...

Page 2: ......

Page 3: ...for inaccuracies or the consequences thereof can be accepted by the manufacturer or the distributor who supplied the manual This manual contains proprietary information of PRM Newage Limited It is int...

Page 4: ...ed oils and oil filling 7 5 INSTALLATION 8 5 1 General 8 5 2 Checking the Engine Flywheel Housing 8 5 3 Checking the Engine Flywheel 8 5 4 Mounting the Gearbox to the Engine 10 5 5 Alignment to Propel...

Page 5: ...of Gearbox 17 9 7 1 Input shaft 17 9 7 2 Output shaft see 9 7 5 for Shimming procedure 17 9 7 3 Idler Shaft 18 9 7 4 Selector Housing assembly 18 9 7 5 Shimming Output Bearings 18 9 7 6 Cone Clutch Se...

Page 6: ...e Ltd direct quoting the serial number CLAIMS UNDER WARRANTY Claims for replacement of parts under warranty must always be submitted with the gearbox serial number to the distributor who supplied the...

Page 7: ...serial number and should always be quoted when ordering spare parts the lower line is the gearbox specification in the example given this translates as follows 60 D 2 First 2 digits Gearbox Model 60...

Page 8: ...abouring 1 GENERAL DATA 1 1Specifications Gear ratios ahead 1 52 1 2 00 1 2 50 1 Gear ratio astern 2 05 1 common POWER RATING MODEL AHEAD RATIO PLEASURE LIGHT COMMERCIAL BHP kW BHP kW 60D1 5 1 52 1 0...

Page 9: ...itate servicing 3 2 Gear train The helical gear train is manufactured from high grade steel with all gears being case hardened for long life All shafts are supported on ball bearings which are amply p...

Page 10: ...elp find solutions to potential torsional problems but it is the ultimate responsibility of the person assembling the drive and driven equipment to ensure that they are torsionally compatible 5 2 Chec...

Page 11: ...9 PRM 60 BASIC INSTALLATION DETAILS PRM 60 Figure 4 Intallation Details...

Page 12: ...housing and tighten fully See fastening torque chart 10 2 5 5 Alignment to Propeller Shaft CAUTION Alignment between the propeller shaft and the mating flange on the gearbox output shaft is extremely...

Page 13: ...d whilst the hull is afloat otherwise there is a danger of the hull distorting because of an insufficient support over its surface If the engine and transmission are fitted before the hull is in water...

Page 14: ...upper hole Make sure the lever forward position corresponds to the forward movement of the vessel The following points should be noted i The gearbox operating lever is provided with a positive neutral...

Page 15: ...when checking the oil level 6 2 Drive selection The PRM 60 has been designed to operate with proprietary single lever control systems which decreases the engine speed to idle before opposite gear sel...

Page 16: ...s first 7 5 Cone Clutch Adjustment The cone clutch is self adjusting and therefore needs no adjustment Should gear selection become difficult it is advisable to check the installation and operaion of...

Page 17: ...tallation Remove examine and replace if necessary Check the alignment of the propeller shaft coupling if necessary rectify by adjusting the shims under the engine mounts or the engine mounts themselve...

Page 18: ...parts in solvent to remove dirt grease and oil Be careful to remove solvent from items before re fitting 9 4 Inspection 9 4 1 Gearcase Inspect for cracks Check sealing surfaces for any scratches dama...

Page 19: ...ng 15 Remove the lever 44 Pass the selector control body 18 through the housing 19 and remove O ring 20 and oil seal 21 if replacing them 9 6 7 Front Cover If it is required to replace the front cover...

Page 20: ...ths Dimension Y 5 Subtract bore face lengths from shaft 14 lengths over bearings 33 to achieve shim requirement Dimension Y A 6 Fit shims as required to within zero to 0 025mm preload Place the shims...

Page 21: ...crew 50 tighten the nut 49 against the selector body 18 to 17 Nm 13lbft This will give 0 60mm clearance between the bottom of the selector shoe 22 and the dog point grub screw 50 at max cone eccentric...

Page 22: ...MT8103 SELECTOR SHOE 1 23 MT8670 OUTPUT COUPLING 1 24 0400286 OIL SEAL 1 25 MT8674 BINX NUT 1 26 0150125 BSP LEVEL PLUG 1 27 0210614 DOWEL PIN 2 28 0970147 3 8 BSP FILLER DIPSTICK 1 29 N A SERIAL PLAT...

Page 23: ...21 PRM 60 13 Exploded view and Cross section Figure 5 Exploded view and cross section...

Page 24: ...22 PRM 60...

Page 25: ...23 PRM 60...

Page 26: ...24 PRM 60...

Page 27: ...ESCRIPTION PRODUCT MT8677 KIT 1 5 1 MT8677 MT8680 MT8688 FORWARD GEAR REVERSE GEAR CONE CLUTCH PRM 60 MT8678 KIT 2 1 MT8678 MT8680 MT8688 FORWARD GEAR REVERSE GEAR CONE CLUTCH PRM 60 MT8679 KIT 2 5 1...

Page 28: ...26 PRM 60 NOTES...

Page 29: ...n specifications are subject to change without notice Accordingly data given herein should be regarded as a general guide only and does not form part of any contract Any specific performance requireme...

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