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41
2. Make sure platform is on the ground. Remove
lowering solenoid valve (FIGS. 41-1 and
41-2). Push on the plunger in the valve by
inserting small screwdriver in the open end
(FIG. 41-3). If the plunger does not move with
a smooth, spring-loaded action (approximately
1/8”), replace the valve cartridge. Reinstall
lowering solenoid valve. Torque valve car-
tridge to 25 - 30 lb-in and hex nut to 15 - 45
lb-in.
CHECKING SOLENOID VALVE
FIG. 41-3
Keep dirt, water and other contaminants
from entering the hydraulic system. Be-
fore opening the hydraulic fl uid reservoir
fi ller cap, drain plug and hydraulic lines,
clean up contaminants that can get in
the openings. Also, protect the openings
from accidental contamination during
maintenance.
CAUTION
REMOVING SOLENOID VALVE
(GRAVITY DOWN POWER UNIT)
FIG. 41-1
VALVE
CARTRIDGE
COIL
NUT
VALVE CARTRIDGE
1/8”
3. Check the hydraulic cylinder. With the plat-
form at vehicle fl oor level, remove the hy-
draulic line from the LOWER port on the cyl-
inder (FIG. 41-4). Hold the control switch in
the “RAISE” position for two seconds while
you watch for hydraulic fl uid at the LOWER
port. A few drops of hydraulic fl uid escaping
the port is normal. However, if fl uid streams
out, piston seals are worn. Replace seals.
FIG. 41-4
LOWER PORT
RAISE PORT
REMOVING SOLENOID VALVE
(POWER DOWN POWER UNIT)
FIG. 41-2
NUT
COIL
VALVE
CARTRIDGE
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