Shock Is Large When Upper Structure Stops Swinging - Komatsu PC200-8M0 Shop Manual

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