Qianjiang QJ150T-10, Operation And Maintenance Manual, Page: 79 / 131

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9 Lubrication system
Preparation data -----------9.1
Fault diagnosis ------------9.2
Oil pump -------------------9.3
9.1 Preparation data
Matters needing attention in operation
After dismantling the oil pump, all the components should be carefully cleaned and their surfaced should be
cleared by high-pressure gas.
When dismantling the oil pump, pay attention to prevent foreign matters from falling into the crankcase.
Function of the lubrication system ： supplying lubricating oil to the wear surface to reduce part wear by turning dry
friction between surfaces into liquid friction between lubricating oil particles ； cooling high-load parts ； absorbing impact
from the bearing and other parts and reducing noises ； increasing air tightness between the piston ring and cylinder wall ；
cleaning and carrying away impurities on part surfaces.
Preparation reference
Item Standard Permitted limit
when changing the oil 0.9L / machine oil
capacity
when dismantling 1L /
Dial clearance between the outer and inner rotors. 0.04
－
0.15 0.20
Clearance between the outer rotor and the pump body. 0.15
－
0.21 0.21
lubricating
pump rotator
Rotor end clearance 0.07-0.12 0.18
9.2 Fault diagnosis
Decrease of machine oil Engine burnt out
Natural loss of machine oil Absence of oil or oil pressure too low
Machine oil leak Oil path blocked
Wear and improper installation of the piston ring Machine oil not used