NO PRESSURE IN SYSTEM Pumps not engaged Engage pumps
Pump not delivering oil for
any of the reasons listed
previously
Follow remedies given
previously
Relief valve not functioning
due to:
Valve setting not high enough
Increase pressure setting of
valves
Valve leaking Check seat for score marks
and reseat
Spring in relief valve broken Replace spring and readjust
valve
Internal leakage in control
valves or cylinders
To determine location,
progressively block off
various parts of circuit. When
trouble is located, repair. (Do
not block between pump and
relief valve).
Relief valve not functioning
due to:
Cold fluid
Warm up system. Work with
oil at recommended
operating temperature range.
(See Operation section).
Air leak or restriction at inlet
line
Repair or clean
Internal parts of pump are
worn excessively
Replace pump
223REVISED:
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