WEICHAI WD10 Service Manual - page 157
Service Manual for WD10 Diesel Engine
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(2) Remove steering pump fastening bolts and spring washers, take down the pump and sealing
gasket.
41153 Inspection and Maintenance of Steering Pump
Three typical fault of steering pump are: leaking oil, hard steering and abnormal noise. Besides,
faults like steering pump gear teeth collision, steering pump shaft breakage and steering pump
housing cracking are also involved.
(1) Leaking oil
Fault phenomenon: Oil level in steering system is dropping, oil leakage is involved.
Possible causes:
1) Check all connecting parts of oil pipes, oil cups, steering gear and booster pump for oil leakage.
If steering pump oil inlet pipe is loose, generally there is oil leakage phenomenon in the inlet
port.
2) So never strike the pump oil inlet pipe (interference fit is adopted between the pipe and pump).
3) Check steering pump pipe joints, replace the seal ring if the joint is leaking, tighten the pipe
fixing bolts.
4) Check engine cylinder block, engine oil sump, steering pump oil cup, transmission box and
transmission box oil cooling pipe for oil leakage. (ATTENTION: Undamaged booster pump
wouldn’t leak oil).
5) Leaking of booster pump oil cup may be caused by poor cleanliness of steering system (result
in blockage of booster pump flow-pressure control valve element), under the circumstance of
rapid steering, high pressure oil leaks out through air hole of oil cup cap due to blockage of
pump oil outlet port. Thereby, this is what results in booster pump fake leaking.
6) Leakage of steering pump, damaged steering pump seals.
Troubleshooting:
1) Replace the failure seals and pipes, tighten each pipe joint fixing bolt.
2) Refill oil if insufficient.
3) Overhaul the engine, engine oil sump, transmission box and cooling oil pipes if there is oil
leakage problem.
4) Check the leaking position carefully, disassemble and clean booster pump flow-pressure
control valve (do not disassemble booster pump), check the cleanliness of steering system and
clean up the leaked oil.
5) Replace steering pump.