• • •
159
HYDRAULIC SYSTEM
Situation Inspection item Solution
The implement cannot be
lifted
Is the hydraulic stop/slow return control dial in
all the way right?
Turn the hydraulic stop/slow return control
dial to left
Is the transmission uid level low? Rell the transmission uid.
Is the air taken in the intake pipe system? Tighten the lter case or connection parts.
Replace the pipe or O-ring if damaged.
Is the oil lter clogged? Clean or replace it.
Is the hydraulic pump defective? Contact the dealer for repair.
Is the control valve dusty or is the O-ring dam-
aged?
Contact the dealer for repair.
The implement cannot be
lowered.
Is the cylinder damaged? Contact the dealer for repair.
Is the hydraulic stop/slow return valve put to
“Close”?
Put the hydraulic stop/slow return valve to
“Open.”
Is the control valve dusty or clogged with for-
eign substance?
Consult the dealer for repair.
Is the cylinder damaged? Consult the dealer for repair.
Is the position control lever on the shallowest
position?
Move the position control lever to the releas-
ing direction.
TROUBLESHOOTING
6640C OPERATORS MANUAL (012612).indd 159 1/30/2012 2:31:10 PM
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