Landoll 7833 Operator's Manual page 35

PROBLEM
Tilt cylinder does not fully extent
after lowering machine into
working position.
Wing tip operating shallow.
Gauge point cylinders not fully
extending.
Machine will not unfold (raise
wing frames out of transport
saddles).
Machine will not tilt (rear upward)
or fold.
Machine will not unfold (raise
wing frames out of transport
saddles).
Machine will not fold or unfold
(both wing frames out of
transport saddles).
Hydraulic depth control limit
valve not working.
TABLE OF CONTENTS
PROBABLE CAUSE
Circuit controls in the tractor are not
properly set up.
Hydraulic wind down pressure is too
low or not operating.
Wing fold down cylinders leaking
internally.
Gauge point cylinders
synchronized.
Gauge point cylinders not installed
in proper series.
Hoses not properly connected.
Tractor valve not working.
Limit valve on hitch safety circuit not
closing b-pass circuit.
Tractor valve not working.
Check valve on hitch safety circuit
not closing; leaking.
Tractor valve not working.
Tractor valve not working.
Hoses not properly connected.
Hoses not properly connected.
TROUBLESHOOTING GUIDE
SOLUTION
Consult the operator's manual for
the tractor. Increase timer setting to
fully stroke the tilt cylinder.
Increase/turn on wing down
pressure.
Repair or replace wing fold cylinder.
Synchronize cylinders by holding
not
hydraulic circuit in extended position
for 5 to 10 seconds after full
extension.
Install cylinders in decreasing
diameters as distance from center
increases.
Check hose routing against
schematics (found in parts manual).
Try a different tractor circuit known
to work.
• Confirm spring plunger to be
depressing limit valve plunder
when folded forward.
• Hitch safety circuit limit valve
leaking and needs replaced.
Try a different tractor circuit known
to work.
• Clean check valve.
• Replace check valve.
Try a different tractor circuit known
to work.
Try a different tractor circuit known
to work.
Check hose routing against
schematics (found in parts manual).
Check hose routing against
schematics (found in parts manual).
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