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7   -  

PRM 60

 

Input Shaft: 

28.5mm diameter with 10 tooth spline to DIN5464. 
 

Propeller thrust: 

Ahead and astern thrust is carried by output shaft bearings of ample capacity for the approved rating. 
 

Output flange: 

102mm diameter, with 4 holes 10.5mm diameter on 82.5 pitch circle diameter. 
 

Installation angle: 

The maximum fore and aft installation angle at rest is 15°. 
 
 
 

2. INTRODUCTION 

Prior to installation of the PRM 60 read and follow the instructions within this manual. Failure to do so will make the 
warranty void. PRM will not be responsible for poor installation,

 

wrong handling or defficient maintainence. It is the 

responsibility of users to install

 

guards and safety devices within maybe required by Health and Safety directives within 

different countries.

 

 
The PRM 60 marine transmission is a simple, lightweight, mechanically operated gearbox for use in pleasure craft. 
Ahead and astern is selected by engaging a cone clutch which requires no adjustment. The PRM 60 can only be 
installed onto engines that 

rotate left hand (anti-clockwise)

 as viewed when standing behind the gearbox output 

coupling facing towards the engine flywheel. 
 

 

3. CONSTRUCTION 

 

3.1 Gearcase 

 
The gearcase is made from heavy duty aluminium alloy rigidly designed and externally ribbed for efficient heat 
dissipation. The case assembly comprises two halves vertically split to facilitate 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 proportioned to absorb all the thrust from the propeller. 
 

 

4. OPERATION 

 

4.1 Output Rotations 

 
With the control lever in the mid, or neutral position no power is transmitted to the propeller as the cone clutch is not 
engaged with either ahead or astern gears. Moving the lever forward i.e. towards the engine selects ahead, and 
rearwards i.e. towards the propeller selects astern. In ahead the output shaft rotates in the opposite direction to the 
input shaft (which rotates as engine). It is therefore necessary to fit a right hand propeller. 
 

4.2 Lubrication 

 
All lubrication is supplied by internal splash with oil cooling being by radiation through the gearbox case. 
 

4.3 Approved oils and oil filling 

 

The gearbox is supplied direct to the distributor/ coustomer without oil and therefore prior to start up it must be filled with 
oil. Unscrew the oil level plug located on the side of the gearbox. Unscrew the oil filling plug located on the top of the 
gearbox. Fill the gearbox with ATF DEXTRON II, III, or IV to GM specification or engineering approved equvalent until 
oil starts draining from the level hole. Refit the oil level plug. Check the oil on the dipstick. Refit the oil filling plug. The oil 
is approximately 0.2 litres. 

 

 

CAUTION:

 Do not mix different brands, types or grade of oil.  

DO NOT OVERFILL THE GEARBOX AS THIS AFFECTS THE GEARBOX PERFORMENCE. 

 

 

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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