The PRM120 gearbox is designed for use in pleasure craft where a simple lightweight transmission is required.
The cone clutches for both ahead and astern are mechanically operated and require no adjustment.
The gearbox is purpose built to operate with standard rotation engines i.e. providing a clockwise rotation of the gearbox input shaft when viewed on input. In forward drive the output shaft rotates opposite to input shaft therefore requiring a right hand propeller.
The reduction ratios offered are 2.04:1, 2.5:1 and 2.94:1 with a common astern ratio of 2.5:1
The heavy duty aluminium gearcase is externally ribbed for strength and heat dissipation.
Direction actuation is by a lever with positive detent positions for ahead, neutral and astern. It is suitable for use with proprietary remote control operating systems which must be of the single lever dual action type, i.e. MORSE MT3 or SL3 which operates the engine throttle in conjunction with the gearlever.
|Max. Input Power||67||50||47||35|
Maximum operating speeds : 5000 rev/min
Note: These powers are expressed in BHP and kW per 100 rev/min engine operating speed, and are measured at the engine flywheel. Ratings have been established to ensure the long trouble free life of the gearbox which should not, therefore, be used at powers in excess of those shown.
Limited to craft used exclusively for pleasure boating; operation at full engine throttle should not exceed 5% of total time, with balance of usage at 90% of full throttle engine speed, or less. Maximum operation 500 hours per year. The selection of PRM120 according to this classification for any commercial boat is not approved by Newage Transmissions Ltd.
Planing or semi-displacement craft used in pleasure or commercial applications may qualify for light commercial rating if annual usage is less than 1500 hours and full throttle operation is limited, with most operating time at partial throttle.
Newage Transmissions Ltd will provide all possible information and assistance to help 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.
The normal Operating temperature should be in the range 50° to 120° using good quality lubricating oil of the same viscosity as that used in the engine.
The PRM120 output shaft can be rotated continuously with the gearbox in neutral.
It is therefore not necessary to fit a propshaft brake when running with the engine shut down, for example when sailing.
|Approximate dry weight||16kg (35lb)|
|Oil capacity||0.8 litres (1.4 pints)|
|Part Number||Outside Diameter||Mounting Hole Pattern||Remarks|
|in||mm||No.||Diameter||Pitch Circle Dia.|
|MT8109||8.50||215.9||6||0.344||8.74||7.875||200.0||SAE 6 1/2 in|
|MT8110||9.50||241.3||8||0.344||8.74||8.750||222.25||SAE 7 1/2 in|
|MT8113||5.965||151.5||8||0.256||6.5||5.512||140.0||Hawker Siddeley Marine|
|MT8083S/A||B/W ( Velvet Drive) adaptor||1.4||3.1|
|MT3054||Tailshaft half coupling ( pilot bored)||1.3||2.9|
|MT3056||Tailshaft flexible coupling||0.7||1.5|
installation drawing for the PRM120 in PDF format (74kb)
parts list for the PRM120 in PDF format (265kb)
The PDF files on this website can be read online or printed using the
free Adobe® Acrobat® Reader.
If you do not have this software installed on your system, you may download it from Adobe's website.
All information given in this website is correct at the time of publication. However in the interests of technical progress, design 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. All goods are supplied in accordance with our standard terms and conditions of sale.
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