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Newage PRM Marine Transmissions - PRM280

The PRM280 marine gearbox is purpose built for use in both pleasure craft and commercial boats; its twin countershaft design provides separate oil-operated multi-disc clutches (which need no adjustment) for ahead and astern drive allowing full rated power to be transmitted continuously in either direction. Newage PRM280
PRM280 Nominal Power Ratings
Model Ahead Ratio Pleasure Light Commercial Heavy Commercial
280D2 1.96:1 3.93 2.93 3.79 2.83 3.58 2.67
280D3 2.94:1 3.93 2.93 3.79 2.83 3.58 2.67
Maximum operating speeds : 4500 rev/min intermittent, 4000 rev/min continuous
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.
Operating Pressure
Minimum - 20.00 bar (290 lb./in), Maximum - 22.06 bar (320 lb./in). Two tapped holes 1/8" BSP on the top, and M18 on the side of the valve block are provided so that the pressure gauge can be fitted if required.
Oil Cooling
The normal operating temperature of the oil should be in the 50C - 80C range and should not be permitted to exceed 90C. An oil cooler is necessary to ensure that correct operating temperatures are maintained, and the valve block is provided with two 3/8" BSP connectors to allow it to be fitted.
Propeller Thrust
Both ahead and astern thrust is carried by the output shaft bearings which are of adequate capacity for all factory approved ratings.
Propeller Free Wheeling
The PRM280 output shaft can be rotated continuously with the gearbox in neutral. It is therefore not necessary to fit a propshaft brake in such applications.

Approximate Weight & Oil Capacity

Approximate dry weight:

PRM280D 48kg (106lb) excluding adaptor, drive coupling and oil cooler
PRM280DP 54kg (120lb) excluding adaptor, drive coupling and oil cooler
Oil capacity: 1.5 litres (2.64 pints) plus the amount require to fill the cooling circuit

PRM280 - Simple Mechanical Operation - Lightweight, Compact & Rugged

  • The PRM90 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 aluminum gearcase is externally ribbed for strength and heat dissipation and therefore requires no oil cooler.
  • 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.

PRM280 - Service Classification Definitions - Pleasure

  • Limited to planing hull pleasure craft; 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 PRM marine transmissions according to this classification for any commercial boat, or in sport-fishing charter boats or in long range pleasure cruisers, is not approved.

PRM280 - Service Classification Definitions - Light Commercial

  • 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.

PRM280 - Service Classification Definitions - Heavy Commercial

  • PRM Newage Limited recommends that all displacement and semi-displacement craft used for commercial applications should be classed as heavy commercial duty. In vessels of this type (including trawlers, purse seiners, lobster and crab boats, tugs, ferries, offshore supply boats etc.) the marine gearbox is expected to work at full governed engine speed. The power setting of the engine must be known and must be within the gearbox's permissible heavy commercial rating.

Important to Note:

  • It is essential for the engine, transmission model, reduction ratio and propeller size to be correctly matched so that the engine can attain its rated speed appropriate to the relevant service classification without labouring.
  • It is also necessary to ensure the torsional compatibility of the complete propulsion system from engine through to propeller, since disregarding this may result in gear noise, particularly at low speed operation, and may even result in damage to the engine as well as the transmission components.
  • Trans Atlantic Diesels 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.

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This Page Last Updated June 11, 2018

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