TROUBLESHOOTING H-38,H-39
20-558
PC58UU-3
1
H-38,H-39
H-38 Hydraulic drift of blade is excessive
H-39 Fine controllability is poor or response of blade is low
Cause Remedy
1
Is leakage from cylinder normal?
No
Defective cylinder piston
packing
Repair or
replace
Yes
2
When hose is disconnected from
valve outlet and plug is installed
instead, is hydraulic drift excessive?
No
Yes
Defective swivel joint
Repair or
replace
3
• Hydraulic drift of blade from
floating position is exces-
sive
When centralized safety valve is
replaced, is trouble repaired?
No
Yes
Defective centralized safety
valve
Replace
4
When suction valve is replaced with
blind plug, is trouble repaired?
No
Defective oiltightness of
spool
Repair or
replace
Yes
Defective safety suction
valve
Repair or
replace
5
• Hydraulic drift of blade is
excessive when it is used to
lift up machine body
When blade safety valve is replaced,
is trouble repaired?
No
Defective oiltightness of
spool
Repair or
replace
Yes
Defective blade safety valve
Repair or
replace
Cause Remedy
1
Is play of lever large in neutral?
No
Yes
2
Does spool move within play range
of lever in neutral?
No
Improper adjustment or trou-
ble of linkage and cable
Adjust, repair,
or replace
Yes
Looseness of fitting parts of
spool spring
Repair or
replace
3
Is hydraulic drift excessive?
No
Defective operation of check
valve in spool or clogging of
drilled hole of spool
Repair or
replace
Yes
Carry out troubleshooting in
H-38 (Hydraulic drift of blade
is excessive)
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