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42
4. Check for dirty raising relief valve (FIGS.
42-1 and 42-2). Clean or replace relief
valve, if necessary.
PLATFORM RAISES PARTIALLY AND STOPS
1. Lower the opened platform to the ground. Do the
CHECKING HYDRAULIC FLUID procedure in
this manual. If necessary, add hydraulic fl uid.
2. Use voltmeter to verify the battery voltage is
12.6 volts or more under load from pump motor.
3. Check for structural damage and poor
lubrication. Replace worn parts.
TROUBLESHOOTING
CHECKING THE RAISING RELIEF VALVE
(GRAVITY DOWN POWER UNIT)
FIG. 42-1
RELIEF
VALVE
ADJUSTMENT
COVER
RESERVOIR
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
CHECKING THE RAISING RELIEF VALVE
(POWER DOWN POWER UNIT)
FIG. 42-2
ADJUSTMENT
COVER
RELIEF
VALVE
RESERVOIR
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