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39
PLATFORM WILL NOT RAISE, BUT MOTOR RUNS
1. Do the CHECKING HYDRAULIC FLUID
procedure in this manual. If necessary,
add hydraulic fl uid.
2. Check for structural damage and replace
worn parts.
3. Check pump oil fi lter in the reservoir
(FIGS. 39-1 and 39-2). Clean or
replace fi lter, if necessary.
4. Check for dirty raising relief valve (FIGS.
39-1 and 39-2). Clean or replace relief
valve if necessary.
CHECKING THE RAISING RELIEF VALVE
(POWER DOWN POWER UNIT)
FIG. 39-2
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
(GRAVITY DOWN POWER UNIT)
FIG. 39-1
ADJUSTMENT
COVER
RELIEF
VALVE
RESERVOIR
RELIEF
VALVE
ADJUSTMENT
COVER
RESERVOIR
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