Komatsu PC210-8, Shop Manual

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UEN00245-02 40 Troubleshooting
18
PC210, 230, 240-8
H-14 Power maximizing function does not work 1
H-15 In compound operation of work equipment, speed of part loaded
more is low 1
Trouble
• Power maximizing function does not work.
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 2-stage relief
solenoid valve
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Swing lock switch
2-stage relief solenoid valve
output pressure
OFF
0 MPa
{0 kg/cm
2
}
ON
2.9 MPa
{30 kg/cm
2
}
2
Malfunction of main relief
valve
Main relief valve may have malfunction. Check it directly.
Trouble
• In compound operation of work equipment, speed of part loaded more is low.
Related
information
Possible
causes and
standard value
in normal state
Cause Standard value in normal state/Remarks on troubleshooting
1
Malfunction of control valve
(pressure compensation
valve) on less load side
Pressure compensation valve of control valve on less load side
may have malfunction. Check it directly.
Compound operation Larger load side Less load side
Boom raise
+
Arm curl
Boom raise Arm curl
Boom raise
+
Arm dump
Arm dump Boom raise
Boom raise
+
Bucket curl
Boom raise Bucket curl
Arm dump
+
Bucket curl
Arm dump Bucket curl
Boom lower
+
Arm dump
Arm dump Boom lower