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PRM
Efficiency Reliability and Performance
PRM marine transmissions have established a world-wide reputation for
quality, reliability and 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 actuated
with adjustment-free cone clutches.
When correctly matched to engine and propeller, every PRM unit will
provide trouble-free operation for many years. 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.
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Installation Flexibility
Purpose-designed for marine use, all standard version PRM gearboxes
have output shafts vertically offset from the crankshaft centreline.
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 4:1 ratio versions.
PRM80, PRM120 and PRM150 units are suitable for use with left-hand
(anti-clockwise) rotating engines only. In standard form, all other PRM
gearboxes are built for use with left-hand rotating engines, but can be
converted simply to accommodate right-hand (clockwise) rotation engines by
turning the oil pump through 180°. A wide range of mounting adapters is
available to enable PRM gearboxes to be fitted to most popular engine
models. An engine/gearbox matching chart is available on request.
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Easy Operation
Hydraulically operated, adjustment-free multi-disc clutches ensure rapid
response to operation of the control lever for good boat handling and
manoeuvrability. All models are designed for use with proprietary single
lever remote control operation systems.
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Operational Convenience
Gear ratios and performance for all models except PRM80 & PRM120
are identical in both left and right hand propeller configuration, making
PRM units 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
gearbox units are designed for operation with normal engine specification
lubricant - eliminating the need for special purpose automatic
transmission fluid.
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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.
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Product Support
A world-wide network of distributors and authorised agents provides
comprehensive after-sales support for all PRM marine gearboxes users,
including servicing facilities and replacement parts availability. Copies
of our current UK and overseas distributor lists are available on request.
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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 temperatures and pressures,
checking oil levels and the occasional inspection of seals for leaks.
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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 PRM
trolling valve is also available as optional equipment on PRM260, 500,
750, 1000 and 1500 models, enabling propeller speeds to be varied from
1200 rev/min down to zero. This electronically-operated unit is fully
inter-changeable with the standard control value and can be retrofitted in
service.
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