Big Joe E30 Operation, Maintenance And Parts Manual page 21

MALFUNCTION
TROUBLE WITH LIFTING OR
LOWERING - Continued
Forks lift, but will not go down.
Load will not hold
Platform does not lift to top. Pump
motor runs.
Forks creep downward under load
when in a raised position.
MISCELLANEOUS
Steering arm does not return to
the upright position.
Truck moves forward when arm is
pulled down.
Steering arm jerks excessively
starting or stopping the truck.
Drive motor is jerky.
BL-E30-0515 - 03-01-2018
Table 4-1 Troubleshooting Chart - Continued
PROBABLE CAUSE
Defect in hydraulic system
a. Oil bypassing internally in con-
trol valve
b. Worn lift cylinder or packing.
a. Oil level too low.
b. Load larger than capacity.
c. Batteries need charging.
Leak in hydraulic system, lift cylin-
der or lowering valve.
a. Week return spring.
b. Binding.
a. Belly-button switch defective.
b. Short in control head.
Drive wheel worn.
Motor internally damaged or worn.
CORRECTIVE ACTION
Check lowering control switch in
control head and lowering sole-
noid on valve assembly (17,
Figure 12-14). Replace as
required.
Replace valve assembly (4,
ure 12-14).
Repack cylinder.
Add oil to reservoir.
Refer to nameplate on side of
mast for maximum load capac-
ity.
Change batteries.
Check for leaking fitting in hydrau-
lic line and repair as required.
Repack lift cylinder or replace
valve assembly (4, Figure 12-
14).
Replace spring.
Check and free the binding item.
Verify that the cable has not
been damaged. Repair or
replace as needed.
Check for short, and repair or
replace as necessary.
Check wiring and repair as
required.
Replace drive wheel if worn to
within 3/4 inch of hub.
Replace motor.
Fig-
4-3