Autoquip FREIGHTLIFT FLT - Manual (Page 74)

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Unit lowers too slowly with a load.
• Check for a pinched hose or tubing.
• The down valve may be malfunctioning. Check
and replace control valve.
• The down valve solenoid mounting is loose
preventing the valve from opening completely.
Check and repair.
• Oil is extremely heavy for the application or low
temperature is causing a thickening of the oil
(see Oil Recommendations in the General
Maintenance section).
• The down valve solenoid may be weak and not
pulling in completely (it will usually chatter). Also,
check the control voltage. Check and repair or
replace.
• Check for a partially blocked or malfunctioning
flow control valve.
Unit raises, then lowers back
slowly.
• The “DOWN” solenoid valve may be energized in
the “open” position. Remove the solenoid coil
and recheck. If the lift does not hold with the
solenoid coil removed, replace the down valve
cartridge.
• The oil line, hose, or fitting may be leading.
Check and repair.
• The hydraulic cylinder rod seal may be leading.
Check to see if hydraulic oil is running down the
outside of the cylinder barrels at the rod end.
Repair as necessary.
NOTE: A small amount of oil at the bottom of the
rod is normal and desirable for proper lubrication of
the cylinder. A lead would cause oil to flow from the
rod area when the lift is in the raised position.
The unit does not raise
completely to the upper level
(press “emergency stop” button
to stop motor.)
• There is some sort of interference with the
platform carriage. Check and correct.
• The load exceeds the capacity of the unit. Lower
the unit, unload, and try again.
• The oil level in the reservoir may be too low.
Check and replace. Determine cause and repair.
TROUBLESHOOTING ANALYSIS