Big Joe PDI Series Operation Maintenance Manual & Parts List page 24

MALFUNCTION
Truck runs forward, but not in
reverse.
Truck runs in reverse, but not in
forward.
Truck runs forward and in reverse
at slow speed; will not run at
higher speeds.
Truck runs forward and in reverse
at second or third speed only.
Truck does not move when con-
trol is in first speed position.
Everything else is normal.
TROUBLE WITH BRAKING
Mechanical brake grabs when
steering arm is in operating posi-
tion.
TROUBLE WITH LIFTING OR
LOWERING
Oil sprays or flows from the top of
the lift cylinder.
Oil foaming from vent cap on
hydraulic reservoir.
4-2
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Table 4-1 Troubleshooting Chart - Continued
PROBABLE CAUSE
Defective speed control switch in
control head or defective contac-
tor.
Defective speed control switch or
defective contactor.
a. Defective second and/or third
speed solenoids or contactors.
b. Limit switch on mast defective
or out of adjustment.
c. Defective time delay.
Defective or open speed control
resistor.
Brake linkage over adjusted.
Defective packing in lift cylinder or
too much oil in reservoir.
Leak in suction line between the
pump and the reservoir or oil too
high.
CORRECTIVE ACTION
Check for positive dc voltage at
number 1 wire on reverse con-
tactor. If not present when steer-
ing arm is in operating position
and speed control is in reverse,
speed control switch is defective.
If voltage is present, contactor is
defective.
Check for positive dc voltage at
number 2-wire on forward con-
tactor. If not present when steer-
ing arm is in operating position
and speed control is in forward
speed, control switch is defec-
tive. If voltage is present, contac-
tor is defective.
Check coils for continuity. Replace
as required.
Adjust or replace.
Replace.
Check for clean, tight connections.
Check resistor for continuity and
replace as required.
Ajust brake.
Check hydraulic oil level. Before
further troubleshooting, fill
hydraulic reservoir so that oil is
to "FULL" mark on dip stick.
Tighten all electrical connec-
tions.
Overhaul lift cylinder and install
new packing, seal, and wiper
ring.
Check oil filter. Replace if neces-
sary. Tighten fittings. Inspect line
and replace if necessary.
PDI0404