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Gearcase Lubrication
NOTE: Use engine oil with API classication 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.
SAE 5 W-30
SAE 10W-30/ SAE 10W-40
SAE 30
SAE 40
SAE 10W-30/SAE 10W-40
SAE 20
SAE 30
SAE 10W
213
Figure 28 Oil Viscosity Chart – Gasoline Vehicles
214
Figure 29 Oil Viscosity Chart – Diesel Vehicles
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 30, Figure 31, and Figure 32). 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 30, Figure 31, or Figure 32). Remove both plugs to allow the lubricant to
drain faster. See preceding NOTE.
Metal particles may be discovered in the uid or on the magnetic drain plug when changing the differential or
transmission uid. These particles are normal and expected for the rst few uid changes. This is a result of the gears
being “net forged”, meaning the gears are forged to a shape very close to the nal gear size but the teeth are not nish
machined prior to assembly. The “nish 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 particles 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 lling the front differential with new lubricant (Figure 30). Tighten
the drain plug to 108 in-lb (12 N·m). Use a funnel when lling the front differential through the lubricant level indicator
hole (1). See Periodic Lubrication Schedule on page 36.Tighten the level indicator plug to 120 in-lb (14 N·m).
Page 44 HUV 4421 Owner’s Manual