TROUBLESHOOTING H-5, H-6
H-5 Auto-deceleration does not work (when PPC shuttle valve is
cause)
j, The control pressure for the travel and swing passes through the PPC shuttle valve and is supplied to the oil
pressure switch.
*
1YES
Does condition
become normal _
when oil pressure
switch is replaced?
NO
H-6 Fine control ability is poor or response is poor
Defective oil pressure switch
Defective operation of PPC
shuttle valve in applicable
system (swing or travel)
Replace
Repair or
replace
Cause
Clogged throttle in LS circuit
Defective servo valve
assembly (LS valve), or
defective servo piston
Remedy
Clean
Replace
20-216
a
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