Komatsu PC58UU-3 User Manual

TROUBLESHOOTING H-35
20-554
PC58UU-3
1
H-35 Fine controllability or response of swing is low
Cause Remedy
1
When air is bled from PPC circuit, is
trouble repaired?
NO
YES
Air remaining in PPC cir-
cuit
Bleed air
"
1
2
Do spool and check valve in it move
smoothly?
NO
Defective operation of
spool
Repair or
replace
YES
"
2
3
When each throttle is cleaned, is
trouble repaired?
NO
YES
Clogging of each throt-
tle
Clean
4
When both PPC hoses are replaced
with each other, is trouble repaired?
NO
YES
Defective PPC valve
Repair or
replace
5
Defective motor
motor unit
safety valve
check valve
suction valve
brake
When spring case sub-assembly on
port B side of arm valve is replaced,
is trouble repaired?
NO
Repair or
replace
YES
Defective check valve of
swing brake circuit of
arm valve
Repair or
replace
"
1
Each throttle in troubleshooting 3 denotes the following.
• Swing PPC circuit throttle (inside spring case of control valve)
• Swing slow return valve (Adapter of PPC pressure inlet of control valve)
• Swing PPC line throttle
• Swing brake reset line throttle
"
2
Replace the hoses at operation pattern change point in inspection window of left
deck (Restore original state immediately after checking).

Komatsu PC58UU-3 Specifications

General

Brand	Komatsu
Model	PC58UU-3
Category	Construction Equipment
Language	English