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PRM 1500D Gearbox 3.88:1 SAE2, PRM1500D
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PRM 1500D Deep Case Marine Gearbox (Ahead Ratio 3.88:1 / SAE2)

Part No. PRM-1500D39SAE2

£8,381.66 You pay £8,381.66 Incl VAT You pay £6,984.72 Excl VAT

RRP £11,641.20 £9,701.00

Save £3,259.54 (28.0%) Save £2,716.28 (28.0%)


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Brand PRM
Country of Origin United Kingdom
Gearbox Manufacturer PRM
Construction High Grade Cast Iron Gearcase
Hydraulic or Mechanical Hydraulic
Gearbox Model PRM 1500D
Ratio Ahead / Stern 3.88:1
Shaft Arrangement Drop Centre
Nominal Power Rating Pleasure 21.06 BHP / 100 RPM
Nominal Power Rating Light Commercial 19.65 BHP / 100 RPM
Nominal Power Rating Heavy Commercial 18.28 BHP / 100 RPM
Approximate Dry Weight 300Kg (663lbs) (excluding drive coupling & cooler)
Capacity Oil Capacity: 8.0 litres (14 pints) (plus the amount required to fill the cooling circuit)
Certification / Approvals Lloyd's approved published ratings
Warranty (Years) 2

Full hydraulic operation drop centre output shaft with two stage reduction gearing.

PRM1500 series marine transmissions are the ideal choice for pleasure and commercial craft applications with engines rated at up to 520 hp (390 kW).

They are available in both shallow and deep case form - corresponding to reduction ratios ranging from 1.22:1 to 3.0:1 and 3.12:1 to 4.9:1 respectively - and are supplied with integral SAE housings as standard.

All PRM1500 series transmissions feature a twin countershaft design compatible with left or right hand propeller rotations - making them equally suitable for both single or twin engine installations. In addition, the PRM1500's two-stage reduction gearing enables maximum input torque of 1500 Nm to be transmitted continuously in either direction at engine speeds of up to 2500 rev/min.

Simple Operation
Operation is by a single lever compatible with proprietary remote control operating systems. The need for special purpose automatic transmission fluid is eliminated by the use of engine oil specification lubricant. Smooth drive engagement in both ahead and astern is achieved by a pressure modulated selection valve - ensuring outstanding boat handling and manoeuvrability.

Durable and Reliable PRM1500 units utilise maintenance-free oil-operated, self-adjusting multi-disc clutches for consistent reliability and in-service performance. The gearcase is manufactured from high grade cast iron and is internally ribbed for extra rigidity and strength. The oil pump, oil filter and hydraulic control valve on all PRM1500 models are mounted externally for easy access and servicing.

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.

Operating Pressure
Minimum - 28.27 bar (410 PSI), maximum 31.03 bar (450 PSI). Two tapped holes, 1 hole 1/8" BSP on the top and 1 hole M18 on the side of the valve block are provided so that a pressure gauge can be fitted if required. Gear selector is designed with modulated engagement for soft shift.

Oil Cooling
The normal operating temperature of the oil should be in the 50°C - 80°C range, and should not be permitted to exceed 90°C. An oil cooler is necessary to ensure that correct operating temperatures are maintained, and two 1/2" BSP connections are provided on the valve block to allow it to be fitted. The size of the cooler required depends on a number of factors including the transmitted horsepower, operating speed, duty cycle, inlet water temperature and ambient temperature.

Propeller Thrust
Both ahead and astern thrust is carried by the output shaft taper roller bearings which are of ample capacity for all factory approved ratings.

Oil Capacity: 8.0 litres (14 pints).

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  • Which PRM 1500D Model is right for my application? +

    Nominal Power Ratings for PRM 1500D Marine Gearbox

    Model Ratios Pleasure Light Commercial Heavy Commercial
    BHP kW BHP kW BHP kW
    1500D31SAE1 3.12:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D31SAE2 3.12:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D39SAE1 3.88:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D39SAE2 3.88:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D45SAE1 4.50:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D45SAE2 4.50:1 21.06 15.70 19.65 14.65 18.28 13.63
    1500D49SAE1 4.90:1 18.28 13.63 16.87 12.58 15.46 11.53
    1500D49SAE2 4.90:1 18.28 13.63 16.87 12.58 15.46 11.53

    Maximum operating speeds: 3,000 rev/min intermittent, 2,500 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.

    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.

    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.

    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.

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