WEICHAI WD10 Service Manual - page 160
Service Manual for WD10 Diesel Engine
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3) Poor cleanliness of steering system, leads to overwear and ablation of steering pump stator and
rotor module, and produces noise.
4) Blockage, twisting or huge deformation of oil pipe results in poor oil supply, or poor system
matching leads to resonance.
Troubleshooting:
1) Check steering system (oil cup, pump, steering gear and pipelines) for oil leakage.
2) Check steering system oil cup (including filter screen and oil level) for air, bubble and blockage
problem.
3) Use echoscope to detect the noise source (oil cup, pump, steering gear and pipelines).
4) Check steering system oil temperature at normal idle engine speed. Cool the system if the
temperature is high, and replace the damaged parts.
(4) Troubleshooting of other steering pump faults
Steering pump gear teeth collision
“Driving gear collision” is mainly caused by dynamic balance failure. Main cause for dynamic
balance failure is improperly installed steering pump (steering pump driving gear and engine
driving gear are not concentric).
Elimination method: Detect the dimension and material of driving gear, steering oil pump
manufacturer is responsible for the disqualification. If the gear is qualified, refit the pump.
Steering pump shaft breakage
“Shaft breakage” is mainly caused by dynamic balance failure. Main cause for dynamic balance
failure is improperly installed steering pump (steering pump driving gear and engine driving gear
are not concentric).
Elimination method: Detect the dimension and material of driving gear, steering oil pump
manufacturer is responsible for the disqualification. If the gear is qualified, refit the pump.
Steering pump housing cracking
Cracking of steering housing back cavity, main cause for this failure is improper sealing of steering
pump oil inlet and outlet joints, directly lead to infiltration of impurities and blockage of filter
screen and damping hole, then result in steering pump safety valve failure and high system pressure.
1) Applied thread seal tape when installing oil inlet and outlet joints, the thread seal tape blocked
filter screen and damping hole.
2) “Flat gasket + thread sealant” seal style is applied, too much thread sealant went into damping
hole and blocked it, and result in steering pump housing cracking——We suggest no thread
sealant.