Swing Acceleration Or Swing Speed Is Low - Komatsu PC210-8 Shop Manual

40 Troubleshooting
H-24 Swing acceleration or swing speed is low
Trouble (1) Swing acceleration or swing speed is low in both directions.
Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
Malfunction of swing control
1
valve (spool)
Malfunction of all control
2
valves (LS shuttle valves)
Malfunction of swing motor
3
(parking brake)
Possible Defective adjustment or
causes and 4 malfunction of swing motor
standard value (safety valve)
in normal state
5 Defective swing motor
6 Defective swing machinery
Trouble (2) Swing acceleration or swing speed is low in only one direction.
Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
Malfunction of swing PPC
1
valve
Malfunction of swing control
Possible
2
valve (spool)
causes and
standard value
Malfunction of swing control
in normal state
3 valve (pressure compensa-
tion valve)
Malfunction of swing motor
4
(suction valve)
Malfunction of swing motor
5
(check valve)
PC210, 230, 240-8
Cause Standard value in normal state/Remarks on troubleshooting
Spool of swing control valve may have malfunction. Check it
directly.
LS shuttle valves of all control valves may have malfunction.
Check them directly.
Parking brake of swing motor may have malfunction. Check it
directly.
a
Swing lock switch
If oil pressure does not become normal after adjustment, swing
motor safety valve may have malfunction or internal defect. Check
safety valve directly.
a
Swing lock switch
Swing machinery may have internal defect. Check it directly.
a
Cause Standard value in normal state/Remarks on troubleshooting
a
Left work equipment control lever
Spool of swing control valve may have malfunction. Check it
directly.
Pressure compensation valve of swing control valve may have mal-
function. Check it directly.
Suction valve of swing motor may have malfunction. Check it
directly.
a
Check valve of swing motor may have malfunction. Check it
directly.
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Left work equipment
control lever
ON Swing relief
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Left work equipment
control lever
ON Swing relief
It may be check by abnormal sound, abnormal heating, metal
chips in drain oil, etc.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Neutral
Left swing
Right swing
Suction valves on right side and left side may be checked by
replacing them with each other and seeing change of condition.
Check valves on right side and left side may be checked by
replacing them with each other and seeing change of condition.
UEN00245-02
Swing relief pressure
28.9 – 32.9 MPa
{295 – 335 kg/cm
Leakage from swing
motor
Max. 10 l/min
PPC valve output pressure
0 MPa
{0 kg/cm 2 }
2.84 – 3.43 MPa
2
{29 – 35 kg/cm }
1
2
}
27