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8 CR Hydraulic Pump - Installation Guide
General guidelines
Try to keep hydraulic fluid loss to a minimum when installing the pump. This
will reduce the time and effort required to bleed the system of trapped air
after installation.
The ram ports (A & B) on the CR pump are tapped to 1/4 in (BSP) parallel
threaded and the reservoir port (R) is tapped to 3/8 in parallel threaded. Use
only bonded rubber or metal washers to seal the fittings.
Ports A and B (yellow capped) are the connections to the ram. Pipework and
connections must be suitable for 100 bar working pressure minimum rating.
The reservoir port R (red capped) must be connected through a continuous
rise to the help pump bottom connection If used with pressurized reservoir
type systems, the pipe must be suitable for at least 7 bar.
CAUTION:
Do not plug the reservoir port. This could result in damage to the
pump and steering failure.
Three NPT adaptors are included for conversion to NPT where required.
Follow the manufacturer’s instructions if you fit any T-pieces.
Make sure all hydraulic pipes slope upwards towards the reservoir.
Fill the system using a good quality 40 grade automotive transmission fluid.
Check for compatibility with the helm pump and ram manufacturers specifi-
cation.
A set of bleed valves near the steering ram, fitted at the highest point, will
allow any air to escape upwards.
CAUTION:
Before running the pump for the first time, make sure the system
contains sufficient hydraulic fluid. You will damage the pump if
you let it run when ‘dry’.
Check valves
For single-steering position boats:
Consult the steering gear manufacturer to determine whether the helm pump
is fitted with reversing check valves:
without check valves, the autopilot pump will drive the helm pump
(sometimes referred to as ‘motoring the wheel’) instead of moving the
steering ram.
87039_2.fm Page 8 Wednesday, April 9, 2014 2:56 PM
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