TROUBLESHOOTING H-5
20-516
PC58UU-3
1
★
The following troubleshooting is not applicable to travel, swing, and blade systems
H-5 Fine controllability is poor or response is low
(Two or more systems have poor fine controllability or
low response simultaneously)
Cause Remedy
1
• See TESTING AND
ADJUSTING
Is LS differential pressure normal?
No
Yes
2
Is orifice of unload valve clogged?
No
Yes
Clogging of orifice of
unload valve
Clean
3
Is orifice of piston pump clogged?
No
Defective PC valve or servo
piston
Repair or
replace
Yes
Clogging of orifice of pis-
ton pump
Clean
4
When LS valve is adjusted, is trouble
repaired?
No
Defective LS valve
Repair or
replace
Yes
Improper adjustment of LS
valve
Adjust
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