Vestil CART-23 & -24, ALL MODELS - Manual (Page 10)

11/13/02 08/17/05 CART manual, power unit operation.doc
10 of 12
T ROUBLESHOOTING G UIDE -- CART-23, -24
Warning: Before performing any task, always remove any load and lower the platform fully to the floor.
* Check the DC notes page for troubleshooting other problems specific to battery-powered units.
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 (DC
units).
Upper-travel limit switch is
engaged or bad.
Bad motor relay coil.
Battery voltage low.
Control cable’s 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, platform doesn’t
move (DC units).
Pump has gone bad. Consult factory.
Motor hums or pump squeals,
but the platform does not
move, or the platform moves
only slowly (DC units).
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 platform
movement.
Excessive air in the hydraulic
cylinders.
Bleed air per procedure
described in this manual.
Platform won’t lower. Solenoid coil is bad or connector
is loose (DC units).
Solenoid valve or suction hose
screen plugged (DC units).
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 platform
movement.
Platform raises, then drifts
down.
Contamination holding open the
lowering valve or the check
valve.
Remove and inspect. Clean per
instructions in this manual.