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Gearcase Lubrication
Page 40 2007 HUV 4421 Gasoline and Diesel Vehicle Owner’s Manual
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) may 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 32, Figure 33, and
Figure 34). 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 32, Figure 33, or Figure 34). Remove both plugs to allow the
lubricant to drain faster. See preceding NOTE. Use the lower plug (2) for drainage (Figure 32, Figure 33,
and Figure 34). Remove both plugs to allow the lubricant to drain faster. See preceding NOTE.
Metal particles may be discovered in the fluid or on the magnetic drain plug when changing the differential or
transmission fluid. These particles are normal and expected for the first few fluid changes. This is a result of
the gears being "net forged", meaning the gears are forged to a shape very close to the final gear size but the
teeth are not finish machined prior to assembly. The "finish machining" occurs when the gears make contact
under load during vehicle operation. The magnetic drain plug is included in the design to collect the metal par-
ticles generated from the gear break in process. This is an established process and is not detrimental to gear
service life.
Front differential:
Clean and install the drain plug (2) and washer before filling the front differential with new lubricant
(Figure 32). Tighten the drain plug to 9 ft-lb (12 N·m). Use a funnel when filling the front differential through
Figure 30 Oil Viscosity Chart – Gasoline Vehicles Figure 31 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