- 14 -
T
ROUBLESHOOTING
:
If the unit does not operate, check all of the electrical connections. In particular, examine the connections at the
battery, the motor, and all points at which a wire connects to the chassis. Also check the quick-connect plug at
the end of the pendant control cord. If the connection is loose, push the plug into the socket.
At room temperature, a fully charged lead acid battery in nominal condition should hold 12.65 volts of electrical
energy. The battery is fully discharged when the voltage drops to 11.9 volts. Do NOT check the voltage unless
the charger has been turned off for at least 1/2 hour.
If the batteries don’t recharge, check the 115V supply circuit in the charger. Also measure the output from the
charger with a voltmeter. If the charger is in normal operating condition, determine the battery’s state of charge
with a hydrometer or a voltmeter.
Problem: Possible
cause(s): Action:
Power unit doesn’t run when “UP”
button is pressed.
Upper-travel limit switch is
engaged or bad.
Bad motor relay coil.
Battery voltage low.
Control cable connector is loose.
Test with meter; replace if bad.
Test with meter; replace if bad.
If LED on motor relay is not on,
check battery voltage with meter.
Check quick-connect plug.
Motor runs but deck doesn’t move.
Pump not functional.
Contact factory.
Motor hums or pump squeals, but
either:
1. the deck does not move; or
2. the platform moves very slowly.
Platform overloaded.
Pressure relief opening at full
pressure.
Verify that the load doesn’t
exceed the table’s capacity.
Check for structural damage or
binding of the scissor legs, etc.
Check for platform overload
condition.
Spongy or jerky deck movement.
Excessive air in the hydraulic
cylinders.
Bleed air per procedure
described in this manual.
Deck won’t lower.
Solenoid coil is bad or connector
is loose.
Solenoid valve or suction hose
screen plugged.
Physical blockage of the
structure.
Check with meter. Check quick-
connect plug.
Remove and inspect. Clean per
instructions in this manual.
Inspect for foreign material or
objects that might block the leg
set or its rollers.
Platform lowers too slowly.
Pinched hose.
Flow control spool sticking.
Velocity fuse locking (platform
only slowly creeps down).
Check pressure, supply, and
return hoses for kinks.
Remove plug from FC port; push
on flow spool to ensure it is fully
pressed into the cavity.
Same as for jerky deck
movement.
Platform rises but slowly loses elevation
(drifts down).
Contamination holding open the
lowering valve or the check
valve.
Remove and inspect. Clean per
instructions in this manual.