HYDRAULIC - PNEUMATIC - ELECTRICAL - ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER
SYSTEM
Oil is drawn through the common intake port and filter to both the high and steering/low pressure pump assemblies.
The high pressure pump supplies constant oil flow according to engine speed, through the trailer brake and remote
valves via a subplate at the bottom of the remote valve stack. The subplate incorporates a flow control valve which
limits the maximum operating pressure.
Oil, after passing through the remote valves, enters the hydraulic lift control valve located at the front of the lift as-
sembly, which controls the raising and lowering of the lift.
All excess oil flow produced by the hydraulic pump is returned direct to the rear axle through the control valve spool
located in the hydraulic lift control valve assembly.
Also located within the assembly is the lift cylinder safety valve, which protects the lift cylinder and seals from exces-
sive peaks of pressure during operation.
For further details on operation of the mechanical hydraulic lift assembly, trailer brake valve and mechanical remote
refer to the appropriate Chapters in this Section of the Repair Manual :
HITCH Electronic draft control - Static description (H.10.D)
(MECH LIFT),
Trailer brake valve - Static description (D.34.C)
(TBV),
PRIMARY HYDRAULIC POWER SYSTEM Closed center mechanical remote valve - Static description (A.10.B)
(MECH REMOTES).
BSF4116A
52
Fixed Displacement Pump High Pressure Hydraulic Circuit Operation
84276322A 31/05/2010
A.10.A / 34
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