Hydraulic System; Hose Types - Lewmar V8 Owners Installation, Operation & Servicing Manual

5. Hydraulic System

5.1 Installation
Windlass unit should be connected to a hydraulic powerpack with directional control valve installed to control
the windlass movement.
Fig 5.1 shows typical hydraulic circuit for a windlass with the Hi-Power or Standard motor/gearbox.
5.2 V8 Hydraulic motor/gearbox
The hydraulic motor/gearbox consists of a high torque hydraulic motor fitted to a 90 degree gearbox or or an
in-line gearbox.
Refer to section 5.5 for flows and pressures information.
The motor gearboxes are not self sustaining. A dual Pilot Operated Check Valve (POCV) must be installed in the
system to temporarily sustain any load. The POCV can be line mounted (as shown in Fig 5.1) or modular type if
for example a CETOP 3 directional valve is being used.
NOTE: To permanently sustain a load a Chain Stopper must be used.
5.3 V9/10/12 Hydraulic motor/gearbox
The hydraulic motor/gearbox consists
of a high torque hydraulic motor fitted
to an in line gearbox with brake.
Refer to section 5.7 for flows and pressures information.
The motor gearbox is self sustaining.

5.4 Hose types

For reliable operation and safety it is essential
Fig 5.1
to use reinforced braid hose for connecting to
DR
the motor A and B ports which conforms to
SAE100R2A or DIN 20 021 Part 2.
The recommended hose sizes are:
• Up to 30 l/min + 1/2" (13mm) bore diameter.
• Up to 40 l/min + 5/8" (16mm) bore diameter.
• Up to 57 l/min + 3/4" (19mm) bore diameter.
• Ref: 3.78 litres = 1 US gallon
4.54 litres = 1 Imperial gallon
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Lewmar V8/V9/V10/V12 Vertical Windlass ref 66300094 Iss.6