Swing Acceleration Is Poor, Or Swing Speed Is Slow - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02633-03
H-24 Swing acceleration is poor, or swing speed is slow
Trouble (1) • Swing acceleration or swing speed is low in both directions.
Related infor-
• Set the working mode in P-mode before start.
mation
Malfunction of LS shuttle
1
valve (all control valves)
Malfunction of swing motor
2
(holding brake)
Possible causes
Defective adjustment or mal-
and standard
3 function of swing motor
value in normal
(safety valve)
state
4 Defective swing motor
28
Cause Standard value in normal state/Remarks on troubleshooting
LS shuttle valves of all control valves may have malfunction. Check
them directly.
Holding brake section of swing motor may have malfunction. Check
it directly.
a
Swing lock switch
If oil pressure does not become normal after adjustment, safety
valve may have malfunction or internal defect. Check safety valve
directly.
a
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Swing lever
ON Swing relief
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Swing lever
Swing relief
40 Troubleshooting
Swing relief pressure
27.95 – 32.85 MPa
{285 – 335 kg/cm
Leakage from swing motor
Max. 11 l/min
PC300, 350-8
1
2
}