Big Joe PTE 30 Series, Эксплуатация, техническое обслуживание, список запасных частей

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4-2 901467
Table 4-1 Troubleshooting Chart - Continued
MALFUNCTION PROBABLE CAUSE CORRECTIVE ACTION
Truck runs forward and in reverse
at lower speeds; will not run at
high speed.
Defective potentiometer (14, Fig-
ure 12-4 ) in control head.
Check for variable resistance at
the potentiometer when direction
control is activated. If not noted,
replace potentiometer.
TROUBLE WITH BRAKING
Truck does not slow with brake, or
brake does not engage.
a. Defective deadman switch (1,
Figure 12-1 ).
Check deadman switch for conti-
nuity. If none found when the
control arm is in the brake posi-
tion, replace switch.
b. Defective electrical brake (24,
Figure 12-6 ).
Replace brake.
TROUBLE WITH LIFTING OR
LOWERING
Oil sprays or flows from the top of
the lift cylinder.
Defective packing in lift cylinder. Repair or replace lift cylinder.
Squealing sounds when lifting
forks.
a. Oil level too low. Add oil to reservoir.
b. Lift linkage binding. Apply grease.
Forks do not lift to top. Oil level too low. Add oil to reservoir.
Weak, slow or uneven action of
hydraulic system.
a. Defective pump or relief valve. Check pressure. Adjust as neces-
sary.
b. Worn lift cylinder. Repair or replace cylinder.
c. Load larger than capacity. Refer to I.D.platefor capacity.
d. Defective lift motor solenoid. Replace solenoid (9, Figure 4-2 )
on electrical panel.
e. Battery charge low. Charge battery.
Forks do not lift, pump motor does
not run.
a. Battery is dead or discon-
nected.
Check and recharge if required.
b. Defective wiring. Check and repair as required.
c. Defect in electrical system for
operating pump motor.
Check lift switch in control head,
as well as the solenoid (9, Figure
4-2 ) on electrical panel. Replace.
Forks do not lift, motor runs. Defect in hydraulic system. Check the oil level in the reservoir
and the oil lines to the lift cylin-
der, and repair as required. If
normal, check the hydraulic
pump, and relief valve. Repair, or
adjust.
Forks lift, but will not go down. Defect in hydraulic system Check lowering control switch (6,
Figure 12-4 ) and lowering sole-
noid on valve assembly (11, Fig-
ure 12-17 ). Replace as required.
Load will not hold a. Oil bypassing internally in con-
trol valve
Replace valve assembly (11, Fig-
ure 12-17 ).
b. Worn lift cylinder. Repair or replace cylinder.