S0708470K
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Steering and Brake Pump (Denison T67DB Series)
TROUBLESHOOTING, TESTING AND ADJUSTMENT
Table below lists the common difficulties experienced with vane pumps and hydraulic systems. It indicates,
possible causes and remedies for each of the problems listed.
Problem Possible Cause Remedy
Excessive noise in pump. Low oil level in reservoir. Fill reservoir to proper level with
recommended fluid.
Air in system. Open reservoir cap and operate
system until purged.
Bleed hydraulic lines at highest
point down stream of pump while
system is under pressure.
Vacuum condition. Check inlet (suction) line and
fittings for air leaks.
Oil too thick. Be certain correct type of oil is
used in system. Warm up pump in
cold weather until noise
disappears.
Damaged or missing pump seals at
mating surfaces.
Locate and replace damaged or
missing seals.
Cartridge kit not assembled
properly.
Reassemble cartridge kit.
Pump inlet/outlet lines reversed. Reconnect lines to proper port
connections.
Pump overheating. Internal leakage. If excessive internal leakage
exists, return to shop for complete
overhaul.
Heat exchanger not functioning. Locate trouble and repair or
replace.
System not developing
pressure.
Relief valve open. Repair or replace.
Loss of fluid internally (slippage). Return to shop for evaluation and
repair.
Cartridge kit not assembled
properly.
Reassemble kit.
Cartridge kit assembled for
opposite rotation.
Reassemble kit to proper rotation.
Pump inlet/outlet lines reversed. Reconnect lines to proper port
connections.
Disconnected or broken drive
mechanism.
Locate and repair.
Loss of fluid. Ruptured hydraulic lines. Locate and repair.
Leaking or missing seals. Locate and repair.
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