King Long XMQ6129Y series, Operating Manual

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Common trouble and elimination
C-5
Too low oil pressure
Possible causes Remedies
1) Diluted or incorrectly selected 1) Select the proper oil.
2) Inner and outer rotors of oil pump worn-out
or too large
2) Replace the oil pump.
3) Oil filter choked 3) Replace the whirling type filter element.
4) Failure of oil filter pressure control 4) Repair it.
5) Gear of oil pump damage 5) Replace it.
6) Inlet oil tube of fuel pump crack 6) Repair or replace it.
7) Fixing bolt of oil pump inlet oil tube loose 7) Tighten the bolt to the required torque.
8) Too large bearing bushings clearance. 8) Check and replace it.
Too high oil pressure
Possible causes Remedies
1) Too low ambient temperature and too
high oil viscosity 1) Use the required grade engine oil. Operate at low speed
after starting, and then check it when the oil temperature is
normal.
2) Over-flow valve clogged 2) Check and clean it
Too high oil temperature and oil consumption
Possible causes Remedies
1) Leakage in the exterior oil line 1) Check and repair it.
2) Too high diesel engine load 2) Decrease the load.
3) Use improper oil 3) Use the oil as required.
4) Piston ring stuck or seriously worn 4) Check and repair, if necessary, replace it.
5) Too much worn out of Cylinder bore
5) Bore the cylinder and use the oversized piston rings or
press in a repair –used cylinder sleeve.
6) Valve guide seriously worn out and failed
seal of valve stem
6) Check and replace.