Autoquip DOUBLE PANTOGRAPH LIFT - Manual (Page 71)

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PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift will not remain in
Raised position.
• The cylinder seals may be leaking.
• The "Down" solenoid may not be seating. Remove
the solenoid coil and check again. If the lift does not
hold with the solenoid coil removed, the down valve
cartridge should be removed and cleaned or replaced
as necessary.
• The oil line hose, or fittings may be leaking. Check
and repair if necessary.
• The “check valve” in the pump assembly may not be
seating. This is indicated by the pump shaft and
motor turning backward on their own with no power
applied. Generally, this condition can be heard.
Replace the pump assembly.
• The Deltatrol regulator is not seating. (Vertical PU)
• The Deltatrol check valve is not seating. (Vertical PU)
• The return filter may be clogged. (Vertical PU)
TROUBLESHOOTING ANALYSIS