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34
1. See the CHECKING HYDRAULIC FLUID procedure. If necessary, add hydraulic fl uid.
2. Use voltmeter to verify the battery shows 12.6 volts or more.
3. Check for structural damage and poor lubrication. Replace worn parts.
4. Check the hydraulic cylinder. With the platform on
the ground, remove the breather plug or vent line
from the vent/down port of the cylinder (FIG. 34-1).
Raise the platform even with the bed. Allow pump
motor to run two seconds more while you watch for
hydraulic fl uid at the vent/down port. A few drops
of hydraulic fl uid escaping the vent/down port is
normal; however, if it streams from the vent/down
port, piston seals are worn. Replace seals.
5. Check fi lter in the pump reservoir. Replace fi lter if
necessary.
6. Check for dirty pump motor relief valve. Clean if
necessary. Replace any worn out relief valve parts.
NOTE: In most cases, you can avoid having to bleed the hydraulic system by
correctly positioning Liftgate platform before opening hydraulic lines.
Refer to following procedure. Save time on the job and prevent accidental
fl uid spills and hazards.
Keep dirt, water and other contaminants from entering the hydraulic system. Before
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
PLATFORM RAISES PARTIALLY AND STOPS
FIG. 34-1
VENT/DOWN PORT
PRESSURE
PORT
TROUBLESHOOTING
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