Autoquip DOUBLE PANTOGRAPH LIFT - Manual (Page 72)

72
PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift seems bouncy
during operation.
• Lower the lift to collapsed position and continue to
hold the “DOWN” button an additional 10-30
seconds to bleed air from the cylinder. Do not
confuse spongy or jerky operation with small surges
that may occur when operating on rough or uneven
floors
• Check for oil starvation.
Motor labors or heats
excessively.
• The voltage may be low. Check at the motor
terminals while the pump is running loaded, not at
the line source or while the pump is idling.
Inadequate wiring can starve the motor even when
the source voltage is ample.
• Most of Autoquip’s standard motors are rated for
intermittent duty (two minute run times with two
minute rests). If a single-phase motor is being run
more than 15 – 20 motor starts per hour, or a 3-
phase motor more than 200 starts per hour, the
problem may be motor over-heating.
• Running against relief pressure unnecessarily due to
over loaded lift or hitting physical stops.
• Failure to observe the wiring diagram on the
nameplate for proper voltage connections. Rewire.
•
The pump may be binding from oil starvation, which
develops high internal heat. Check for low oil level
or closed breather holes in the reservoir fill plug.
The pump can be irreparably damaged by oil
starvation and may have to be replaced.
TROUBLESHOOTING ANALYSIS