SEN06139-00
PC200, 200LC, 220, 220LC-8M0 40-500 37
500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-25 Shock is large when upper structure stops swinging
H-25 Shock is large when upper structure stops swinging
Failure q Shock is larger when upper structure stops swinging
Related infor-
mation
q Perform all troubleshooting with working mode in power mode (P).
Probable
causes and cri-
teria
Cause Criteria and troubleshooting procedure
1
Malfunction of swing PPC
valve
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
lever
PPC valve output pressure
Neutral
0 MPa
{0 kg/cm
2
}
Left swing
Right swing
2.84 to 3.43 MPa
{29 to 35 kg/cm
2
}
2
Clogged swing PPC slow
return valve
Swing PPC slow return valve may malfunction. Check it.
* This failure can be checked by interchaning right and left swing
PPC slow return valve and watching how condition changes.
3
Malfunction of swing motor
(shockless valve)
Shockless valve of swing motor may malfunction. Check it.
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