8
Troubleshooting
Numbers in parentheses refer to item numbers in the breakdown on page 9.
Trouble Probable
Cause
Remedy
Hydraulic unit does
not lift.
Oil level is low.
Make sure there is no oil leakage
from Release Screw (41), Pressure
Adjustment Screw (43) or valve area.
Then add oil.
Air in pump.
See “Cleaning the Release Valve.”
Worn o-ring in ram cylinder.
Replace o-ring (refer to “Seal and O-
Ring Replacement”).
Once lifted, truck
lowers by itself.
Steel ball (69) has not seated in
hydraulic unit.
See “Cleaning the Release Valve.”
Worn o-ring in ram cylinder.
Replace o-ring (refer to “Seal and O-
Ring Replacement”).
Release valve not seated properly.
See “Cleaning the Release Valve.”
Pallet truck loaded beyond capacity.
Reduce load to within capacity.
Release valve not adjusted properly.
Adjust valve by Pressure Adjustment
Screw (43) and Release Screw (41).
Oil leakage from Release Screw (41)
or Pressure Adjustment Screw (43).
Tighten Release Screw (41). Replace
o-rings on Release Screw (41) and/or
Pressure Adjustment Screw (43). If
leakage continues, contact authorized
service center.
Fork does not lower.
Cam requires adjustment.
Refer to “Up-Down Cam Adjustment.”
Cam (15) is damaged.
Replace cam (15).
Damaged push rods and/or linkages.
Replace damaged parts. (It is
recommended that an authorized
service center perform this work.)
Lever does not set at
NEUTRAL position.
Cam requires adjustment.
Refer to “Up-Down Cam Adjustment.”
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call
1-800-274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and
Serial Number of your machine available when you call will allow us to serve you quickly and accurately.
Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from
JET. Some parts are shown for reference only, and may not be available individually.
