Komatsu PC210-8, Руководство по ремонту

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UEN00245-02 40 Troubleshooting
20
PC210, 230, 240-8
H-18 Machine deviates during travel 1
Trouble
• Machine deviates during travel.
Related
information
• Carry out all troubleshooting in power mode (P) of working mode.
Possible
causes and
standard value
in normal state
Cause Standard value in normal state/Remarks on troubleshooting
1
Malfunction of travel PPC
valve
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever PPC valve output pressure
Neutral
0 MPa
{0 kg/cm
2 }
Forward
Reverse
2.84 – 3.43 MPa
{29 – 35 kg/cm
2 }
2
Malfunction of self pressure
reducing valve
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Control lever Control circuit basic pressure
All levers in neutral
2.84 – 3.43 MPa
{29 – 35 kg/cm
2
}
3
Defective adjustment or
malfunction of LS valve
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Measured oil
pressure
Operation of levers and oil pressure ratio
All levers in neutral
Travel with no load
(Lever operated half-
way)
Pump discharge
pressure
Almost same
pressure
1
PC valve output
pressure
Approx. 0.6
(Approx. 3/5)
If oil pressure does not become normal after adjustment, LS valve
may have malfunction or internal defect. Check LS valve directly.
4
Malfunction of travel
junction solenoid valve
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever
Travel junction solenoid valve
output pressure
Both sides in neutral
0 MPa
{0 kg/cm 2 }
Either side operated
2.9 MPa
{30 kg/cm 2 }
5
Malfunction of travel
junction valve
Travel junction valve may have malfunction. Check it directly.
6
Malfunction of travel control
valve (spool) Spool of travel control valve may have malfunction. Check it
directly.
7 Defective travel motor
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Travel lever Leakage from travel motor
Travel relief 27.2
l
/min
8 Defective final drive
Final drive may have internal defect. Check it directly.
a
It may be checked by abnormal sound, abnormal heating,
metal chips in drain oil, etc.