Troubleshooting
4000 SRM 764
Operator Platform Adjustment
1.
Install the load rollers on the operator platform.
Install the shims for the rollers in the same se-
quence on the stub shaft as they were before dis-
assembly. There must be no shims between the
roller and the weldment on the two top rollers
only.
2.
Use a crane to raise the operator platform within
the inner mast weldment. Find the point of tight-
est fit between the load rollers and the inner
mast weldments.
3.
Remove the operator platform from the mast.
Adjust the shim arrangement for each roller for
clearance between the roller and the inner mast
weldment. The clearance must be 0.1 to 0.8 mm
(0.004 to 0.031 in.) at the POINT OF TIGHTEST
FIT. Repeat Step 2 and Step 3 if necessary.
4.
Keep the shim arrangement on each side of the
carriage or operator platform approximately
equal. The operator platform must run parallel
with the inner mast weldment.
5.
After adjustment, lubricate the mast roller chan-
nels with a thin layer of grease.
CAUTION
Too much grease can cause the rollers to slide
and wear flat areas on the rollers.
6.
Slowly raise and lower the mast several times
without a load. The mast components must raise
and lower smoothly in the correct sequence. The
inner mast weldments and the operator platform
must lower completely.
NOTE:
Some parts of the mast move at different
speeds during raising and lowering.
Troubleshooting
PROBLEM
POSSIBLE CAUSE
PROCEDURE OR ACTION
No movement of lifting cylin-
ders.
Lift control linkage disconnected.
Connect lift control linkage.
No oil or not enough oil to supply
cylinders.
See the section Periodic Mainte-
nance for the correct oil level. Fill
hydraulic oil to correct level.
Hydraulic leaks, bad pump or pump
drive, relief valve set too low, bad
check valve.
Repair leaks. Replace pump or pump
drive. Adjust relief valve or replace
check valve.
Slow action of lifting cylin-
ders.
Not enough oil supply to cylinders.
See the section Periodic Mainte-
nance for the correct oil level. Fill
hydraulic oil to correct level.
Bad cylinder seals.
Replace cylinder seals.
Relief valve pressure is adjusted in-
correctly.
Adjust relief valve pressure.
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