PRM Marine Transmissions
PRM marine transmissions have established a world-wide reputation for quality, reliability an in-service performance, making them the ideal choice for pleasure, workboat and fishing vessel applications.
All PRM hydraulically operated gearboxes feature a twin countershaft design, which enables full rated power to be transmitted in ahead or astern, with either left or right hand propellers.
PRM80 and 120 are mechanically accurate with adjustment-free cone clutches.
When correctly matched to engine and propeller, every PRM unit will provide trouble free operation for many years.
DOWN ANGLE
All parts are designed for maximum reliability over an extended service life.
In addition, running gear components are carefully specified and machined to the highest quality standards to ensure quiet and smooth operation.
ISTALLATION FLEXIBILITY
Purpose designed for marine use, all standard version PRM gearboxes have output shafts vertically offset from the crankshaft centre-line. However, to cater for the installation demands of the widest range of hulls, both the PRM260 and PRM750 are available with an in-line configuration, while down angle options are offered on the PRM750 (8") and PRM1000 (10"), excluding the 4:1 ratio versions.
PRM80, PRM120 and PRM150 units are suitable for use with left-hand rotating engines, but can be converted simply by turning the oil pump through 180°.
A wide range of mounting adapters are available to enable PRM gearboxes to be fitted to most popular engine models. An engine/gearbox matching chart is available on request.
Easy Operation
Hydraulically operated, adjustment free multi-desk clutches ensure rapid response to operation of the control lever for good boat handling and maneuverability. All models are designed for use with proprietary lever remote control operating systems.
Operational Convenience
Gear ratios and performance for all models except PRM80 and PRM120 are identical in both left and right hand propeller configuration, making PRM units the ideal choice for twin engine installations. Propellers can be trailed indefinitely -- for example when sailing, under tow or in multi-engine installations where one or more engines is shut down.
All PRM gearboxes units are designed for operation with normal specification lubricant - eliminating the need for special purpose automatic transmission fluid.
Safety
Built for reliability and durability, PRM hydraulic gearboxes are equipped with a 'get you home' mechanical lock-up device. This additional safety feature maintains the operating clutches in engagement so that the vessel can be brought safely back to port in the unlikely event of hydraulic failure.
A safety start switch is also available as an option on all hydraulic models. This prevents the engine from being started unless the gearbox is in neutral - eliminating the risk of inadvertent damage due to uncontrolled boat movement on start-up.
Servicing
All PRM marine gearboxes allow easy access to major components. In addition, service items such as oil pumps and hydraulic control valves are conveniently mounted externally.
Gearboxes feature a split gearcase configuration to simplify major overhaul operations.
Routine maintenance is limited to verifying operating temperature and pressure, checking oil levels and the occasional inspection of seals for leaks.
Optional Equipment
A range of clutched and direct drive power take-offs is available with SAE housings to power on board equipment such as pumps and winches.
The Newage trolling valve is also available as optional equipment on PRM260, 500, 750, 1000 and 1500 models, enabling propeller speeds to be varied from 1200rev/min down to zero. This electronically operated unit is fully interchangeable with the standard control valve and can be retrofitted in service.
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ZF Group
At ZF Great Britain Ltd we provide After Sales and Original Equipment support for UK manufacturers, importers and end users via a modern, purpose-built 6226m² facility. Our technical service teams, workshop and stores provide a customer focused, innovative and forward thinking service to all customers of the ZF Group.
