Autoquip SERIES 35 SCISSORS LIFT - Manual (Page 44)

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PROBLEM POSSIBLE CAUSE AND SOLUTION
Lift Raises, Then Lowers
Slowly. Down solenoid may not be seating. Remove solenoid coil and
check. If lift does not hold with solenoid coil removed, remove and
clean down valve cartridge or replaced as necessary
.
Oil line, hose, or fitting may be leaking. Check and repair if
necessary.
Check valve in pump assembly may not be seating. This is
indicated by pump shaft and motor turning backward on their own
with no power applied. Generally, this condition can be heard.
Replace pump assembly.
Lift Lowers Slowly.
Down solenoid is not operating properly due to debris or damage.
Check for pinched tubing or hose. Where pipe is used, check for
obstruction in line.
Thick oil due to low ambient temperatures. Add or replace with
lower weight oil that stays thin in cold conditions (5W-15, etc.)
If foam is visible in tank oil, check for loose connection in suction
line between pump and tank. Tighten connections.
Lift Does Not Raise. Motor rotation for a 3-phase motor may be reversed. Reverse two
motor electrical leads.
Check for line or hose leak.
Check for low oil in reservoir. Add specified oil as necessary.
Load may exceed rating. See the Specifications section. Remove
excess load.
Suction screen may be clogged, starving pump. Remove and
clean screen. Drain and replace oil.
Suction line may be leaking air due to a loose fitting. Tighten as
needed.