Chapter 2: Installation
35
2.6 Hydraulic Drive Systems
This section covers the installation of hydraulic system components
together with relevant plumbing and cabling procedures.
For optimum autopilot performance it is important that the pump specifica-
tions given below match the vessel's steering ram.
Pump to Cylinder Specifications
Pump Capacity
Type 1 80 to 230cc (4.9 to 14cu in)
Type 2 160 to 350cc (9.8 to 21cu in)
Type 3 250 to 460cc (15 to 28cu in)
CR1 350 to 500cc (21 to 30cu in)
CR2 500 to 1200cc (30 to 73cu in)
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Reversing Hydraulic Pumps (Type 1, Type 2 & Type 3)
Mounting
The hydraulic pump should be mounted in a horizontal position clear of
spray and possible water immersion. It should also be located as near as
possible to the hydraulic steering cylinder.
Bolt the hydraulic pump to a substantial member to avoid vibration that
could damage the interconnecting pipework.
Cabling
Using a suitably sized cable (see below) route the pump leads back to the
course computer and connect to the motor terminals.
Type 1 Drive Unit
Cable Length (Drive Unit
to Course Computer)
Cable Gauge Copper Area
Up to 3m (10ft) 12 AWG 2.5 mm
Up to 5m (16ft) 10 AWG 4 mm
Up to 7m (23ft) 8 AWG 6 mm
Up to 10m (32ft) 6 AWG 10 mm
Up to 16m (52ft) 4 AWG 16 mm
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