Vestil CBS Series - Manual (Page 11)

06/08 21-126-122
V ESTIL M FG . C O . 11
T ROUBLESHOOTING G UIDE -- CBS
Warning: Before performing any task, always lower the forks fully to the floor and disconnect the power supply.
Consult the “power unit’s operation” page before attempting to remove any hydraulic valves.
Consult the factory for problems at time of installation, or for any problems not addressed below.
Problem: Possible cause(s): Action:
Power unit doesn’t run when “UP”
button is pressed.
Fuse is blown.
No supply voltage.
Upper-travel limit switch is engaged
or damaged.
Bad connection in control circuit.
Bad control transformer (AC units).
Open motor relay coil.
Battery voltage low (DC units).
Test with meter; replace if bad.
Test with meter. Check fuses,
breakers, and overloads to
determine the cause.
Inspect and test switch. Replace if
bad.
Test all parts of circuit with meter.
Check for 24 VAC; replace if bad.
Test with meter; replace if bad.
Test with meter. Charge battery if
low (is motor relay LED on?)
Motor runs properly, forks don’t
raise. Motor and pump not noisy.
Motor rotation is wrong.
Pump has failed.
Fluid level is low. Verify motor shaft rotates CCW.
Consult factory for replacement.
Ensure reservoir is filled.
Motor or control enclosure hums,
chatters, or buzzes, or some type
of squeal can be heard; the forks
do not move, or the forks move
only slowly..
See above, for when the forks don’t
raise.
Excess voltage drop to motor, or
bad (high-resistance) connection.
Motor is “single-phasing” (three-
phase units only).
Pressure relief opening at full
pressure.
Contamination holding open the
lowering valve or the check valve.
Same as above.
Loosen and clean all wire
connections, including at the
battery. Check incoming AC
voltage while motor is running.
Determine cause of loss of voltage
on one phase; correct.
Check for structural damage or
binding of the guide rollers, etc.
Check for overcapacity condition.
Remove and inspect. Clean per
procedure on the “power unit
operation” page in this manual.
Forks raise, then drift down. See last paragraph, above. Same as above.
Forks lower too quickly. See last paragraph, above.
Flow control spool is stuck.
Same as above.
See next item, below.
Forks lower too slowly. Flow control spool is stuck.
Pinched hose.
Velocity fuse locking (forks only
slowly creep down).
Remove lowering valve from its
port; push on flow spool to ensure
it is fully pressed into the cavity.
Check pressure, supply, and return
hoses for kinks.
Same as for jerky forks motion,
below.
Forks won’t lower. Velocity fuse locking.
Control transformer fuse blown.
No supply voltage.
Valve solenoid is bad.
Bad connection in control circuit.
Physical blockage of the structure.
Solenoid valve or suction hose
screen plugged.
Same as for jerky forks motion,
below.
Test with meter; replace if bad.
Test with meter. Check for cause of
power loss.
Check the solenoid with a
multimeter (on diode-check
function for AC -- reading for
ohms will not provide an accurate
test of an AC solenoid coil.)
Test all parts of circuit with meter.
Inspect for foreign material or
objects that might block the forks
or the fork carrier’s guide rollers.
Remove and inspect. Clean per
procedure on the “power unit
operation” page in this manual.
Spongy or jerky forks motion. Excessive air in the hydraulic
cylinder.
Bleed air per procedure on the
“power unit operation” page in
this manual.