Landoll 7822 Series Operator's Manual page 31

Problem
Wings fold too fast.
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 fold or unfold
(both wing frames out of
transport saddles).
Hydraulic depth control limit
valve not working.
Wheel bearing failure.
TABLE OF CONTENTS
Cause
Restrictors not properly installed.
Hydraulic wind down pressure is too
low or not operating.
Wing fold down cylinders leaking
internally.
Front wing gauge wheels set too
low.
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.
Hoses not properly connected.
High pressure manifold filter dirty.
Hoses not properly connected.
Depth stop contracts limit valve
does not close off flow.
Machine will raise by not lower.
Seals not properly installed.
TROUBLESHOOTING
Solution(s)
Black restrictor fittings should be
installed in the rod ends of wing
cylinders.
Increase/turn on wing down
pressure.
Repair or replace wing fold cylinder.
Adjust front wing gauge wheels.
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.
Check hose routing against
schematics (found in parts manual).
Replace filter.
Check hose routing against
schematics (found in parts manual).
• Clean check valve.
• Replace check valve.
Check limit valve and manifold for
correct plumbing.
Triple lip seal should be installed
with lips points outward away from
the hub.
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