Rev. 9/10/2020
EHLTP-4864-2-60-D2 MANUAL
Copyright 2020 Vestil Manufacturing Corp. Page 10 of 12
TROUBLESHOOTING GUIDE
Identify all potential hazards and comply with applicable safety procedures before
beginning work.
Remove all loads from the platform and install the maintenance props before beginning
any inspection or service on the lift table.
Only qualified individuals trained to understand mechanical devices, electrical and hydraulic circuits, and the
hazards associated with them, should troubleshoot or repair this equipment.
for any problems not addressed in this manual. ALWAYS have the product serial
number or model number on hand when calling the factory.
PROBLEM
POSSIBLE CAUSES
ACTION
Power unit doesn’t run when “UP”
button is pressed.
Transformer fuse is blown.
Test with meter. Replace if bad.
No supply voltage.
Test with meter. Check fuses, breakers,
and overloads to determine the cause
Upper-travel limit switch is engaged or
bad.
Inspect and test switch. Replace if bad.
Bad control transformer.
Check for 24 VAC at secondary. Replace if
bad.
Bad motor relay coil.
Test with meter. Replace if bad.
Bad solenoid start switch (DC units).
The green LED on motor relay will be off,
or will turn off when the UP pushbutton is
pressed.
Battery voltage low (DC units).
Test with meter. Charge battery if low (is
the motor relay LED on?)
Motor runs but platform doesn’t
move. Power unit not noisy.
Motor rotation is wrong (AC-powered units
only).
Verify the motor runs CW, opposite the
shaft end.
Pump is failing to produce pressure.
Consult factory.
Motor hums or pump squeals, but
the platform does not move, or the
platform moves only slowly.
Pump is failing to produce pressure.
Consult factory.
Excess voltage drop to motor, due to
power wire size too small, wire run to
long, or incoming voltage too low.
Check the power installation for adequacy.
Check the incoming voltage
while the
motor is running
. Correct any problems
found.
Motor is “single-phasing”.
Determine and correct cause of voltage
loss on phase.
Pressure relief opening at full pressure.
Check for structural damage or binding of
the scissor legs, etc.
Check for platform overload condition.
Contamination holding open the lowering
valve or the check valve.
Remove and inspect valves. Clean per
instructions in the “Inspection and
Maintenance” section.
Platform raises, then drifts down.
Contamination holding open the lowering
valve or the check valve.
Remove and inspect valves. Clean per
instructions in “Inspection and
Maintenance” section.
Spongy or jerky platform
movement.
Excessive air in the hydraulic cylinders.
Bleed air per procedure described in the
“Inspection and Maintenance” section.
Platform won’t lower.
Perimeter toe guard actuated.
Check for a toe guard extrusion or rubber
corner that is stuck. Adjust if necessary.
Perimeter toe guard switch or wire broken. Inspect visually; check with multimeter.
Repair as needed.
Solenoid coil is bad.
Check with multimeter using the diode-
check function. (Reading for ohms will not
provide an accurate test of the coil).
Replace if bad.
Physical blockage of the mechanism.
Inspect for foreign material or objects
blocking the scissors or the rollers.
Solenoid valve, flow control, or suction
hose screen plugged.
Remove and inspect valves. Clean per
instructions in “Inspection and
Maintenance” section.
Platform lowers too slowly.
Solenoid valve, flow control, or suction
hose screen plugged.
Remove and inspect valves. Clean per
instructions in “Inspection and
Maintenance” section.
Velocity fuse locking (indicated by
platform only slowly creeping down).
Check for air in hydraulic system. Bleed air
as needed.
Flow control valve spool sticking.
Remove and inspect valves. Clean per
instructions in “Inspection and
