11921 Slauson Ave.  Santa Fe Springs, CA.  90670  (800) 227-4116  FAX (888) 771-7713
48
1. With platform at bed height, check oil level 
in the pump reservoir (FIG. 48-1). To add 
oil, pull out fi ller cap (no threads) (FIG. 
48-1). Add hydraulic oil in reservoir to the 
level shown in FIG. 48-1.
2. Reinstall fi ller cap (FIG. 48-1).
STEP 8 - CHECKING HYDRAULIC OIL
CAUTION
Keep dirt, water and other contaminants from entering the hydraulic system. 
Before opening the hydraulic fl uid reservoir fi ller cap, drain plug and hydrau-
lic lines, clean up contaminants that can get in the openings. Also, protect the 
openings from accidental contamination. 
FILLER CAP
RESERVOIR
PUMP RESERVOIR
(GRAVITY DOWN POWER UNIT SHOWN)
FIG. 48-1
2-1/4” +/- 1/4” (GD)
2-3/4” +/- 1/4” (PD)
3. Bolt on the pump cover as shown 
in FIG. 48-2. Torque the bolts (cap 
screws) to 10 - 14 lb-in.
BOLTING ON PUMP COVER
FIG. 48-2
+50 to +120 Degrees F - Grade ISO 32  
 Below + 70 Degrees F - Grade ISO 15 or MIL-H-5606
NOTE: Liftgate is shipped with ISO 32 oil. Use correct oil for climate conditions.
See TABLES 49-1 & 49-2 for recommended brands of ISO 32 & ISO 15 oils. 
NOTE: Hydraulic oil level must be mini-
mum of 1-1/2” above the bottom 
of reservoir to operate Liftgate.
POWER UNIT
(REF)
PUMP COVER
CAP 
SCREWS
(5 PLACES)
FLAT
WASHERS
(5 PLACES)
PUMP MOUNT
PLATE