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Gearcase Lubrication
2007 HUV 4421 Gasoline and Diesel Vehicle Owner’s Manual Page 39
OIL VISCOSITY
Choose the viscosity according to the temperature as shown in the appropriate oil viscosity chart (Figure 29
or Figure 30). See following NOTE.
NOTE: Use engine oil with API classification SJ for gasoline engines and CF for diesel engines.
Using multi-grade oils (5W-20, 10W-30, and 10W-40) will increase oil consumption. If multi-grade oil is used,
check the oil level more frequently.
GEARCASE LUBRICATION
NOTE: Dispose of used oil according to the environmental laws and regulations for your area.
LUBRICATION LEVEL CHECK FOR FRONT DIFFERENTIAL, TRANSMISSION, AND
REAR DIFFERENTIAL
Each gearcase component is equipped with two oil port plugs (1 and 2) (Figure 31, Figure 32, and
Figure 33). When the vehicle is on a level surface, use the level indicator hole (upper plug) (1) as a lubricant
level indicator. Lubricant level should be even with the bottom of level indicator hole (1).
LUBRICATION CHANGE FOR FRONT DIFFERENTIAL, TRANSMISSION, AND REAR
DIFFERENTIAL
Use the lower plug (2) for drainage (Figure 31, Figure 32, or Figure 33). Remove both plugs to allow the
lubricant to drain faster. See preceding NOTE.
Front differential:
Clean and install the drain plug (2) and washer before filling the front differential with new lubricant
(Figure 31). Tighten the drain plug to 9 ft-lb (12 N·m). Use a funnel when filling the front differential through
the lubricant level indicator hole (1). See Periodic Lubrication Schedule on page 32. Tighten the level indi-
cator plug to 10 ft-lb (14 N·m).
Figure 29 Oil Viscosity Chart – Gasoline Vehicles Figure 30 Oil Viscosity Chart – Diesel Vehicles
SAE 5W-30
SAE 10W-30
SAE 30
SAE 10W-30/SAE 10W-40
SAE 20
SAE 30
SAE 10W