Autoquip P-25-005 Manual De Instalación, Operación Y Servicio página 41

PROBLEM
Lift Raises, Then Lowers
Slowly.
Lift Lowers Slowly.
Lift Does Not Raise.
POSSIBLE CAUSE AND SOLUTION
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.
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.
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.
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