Raymarine M81120 Installation Manual page 10

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Hydraulic Pump - Installation Guide
• Try to keep hydraulic fluid loss to a minimum when installing the
WARNING:
Before disconnecting any pipes on pressurized systems, you
MUST release the pressure at the reservoir by following the
manufacturer's instructions.
• Follow the manufacturer's instructions if you fit any T-pieces.
• All hydraulic pipes should slope upwards towards the reservoir.
• A set of bleed valves near the steering ram, fitted at the highest
CAUTION:
Do not use PTFE tape on hydraulic pipe connections. If necessary
use a pipe-sealing compound to ensure a leakproof joint.
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
• If the boat has a single helm pump system without check valves,
• A double pilot check valve may also be necessary on long tubing
Note: If the boat has two steering positions, it will already have check
valves installed so the two wheels can operate independently.
pump. This will reduce the time and effort required to bleed the
system of trapped air after installation:
• non-pressurized systems: temporarily fit a non-venting plug
to the helm reservoir vent to minimize fluid loss
• pressurized systems:
point, will allow any air to escape upwards.
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
you must incorporate a double pilot check valve (part number
M81166) as shown in Figure 5.
runs - otherwise tubing expansion may cause poor autopilot
performance. Install the check valve as shown in Figure 5.
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