20 SECTION 35 - HYDRAULIC SYSTEM
2.6 DISASSEMBLY AND ASSEMBLY
DISASSEMBLY STEERING CONTROL VALVE
To aid reassembly draw an alignment line along the
total length of the pump assembly.
Remove the screws (1).
Remove the load sensing steering control valve (2).
Check and eventually replace the O-rings (35).
DISASSEMBLY STEERING CONTROL VALVE
Do not disassemble the steering system relief valve
(A) if the steering circuit relief valve pressure was to
specification when pressure testing the pump prior
to overhaul.
NOTE: if the steering system relief valve is disas-
sembled then the valve must be reset as described
in the trouble shooting pressure and flow testing
chapter before the vehicle is recommissioned.
Wash all components in an approved degreasant
and inspect for the following.
Valve bore must be free from scoring and damage to
metering edges.
The spool (3) should slide freely in the bore and be
free of scoring and damage.
Ensure all orifices are clean.
The relief valve seat should be free from pitting and
damage. A small chamfer on the mouth of the bore
is permissible.
Examine the filter (7) which fit inside the unload and
relief valves. The filter must be replaced if contami-
nated.
Pressure and flow test the pump.
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