Hummer H1 (2006+). Manual - part 9

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General Information, Lubrication and Maintenance

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Axle and Geared Hub

Check axle and hub lubricant condition and level every 6,000 mi (9,700 km) or semiannually, whichever occurs first.

Geared hub level should be within 1/2 in. (12.7 mm) of fill plug opening when lubricant is cold, or to plug level when hot.

Axle level should be within 1/4 in. (6.4 mm) of fill plug opening when lubricant is cold, or to plug level when hot (Figures 1-25
and 1-26).

Change axle and hub lubricant when contaminated by water or foreign material.

The geared hubs use GL-5, SAE 80W-90 or 75W-90 gear lubricant only.

For the axles, use only HUMMER H1 Synthetic Gear Lube  75W-90 with friction modifier.

Figure 1-25:   Geared Hub Fill/Drain Plug Locations

Figure 1-26:   Axle Fill/Drain Plug Locations

LUBRICATION POINT

FILL PLUG

DRAINPLUG

LUBRICATION

 POINT

FILL PLUG

DRAINPLUG

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Geared Fan Drive

CAUTION: If the fluid level is checked when the unit is hot, some of the expanded fluid will run out and create a low fluid condi-
tion.

The fluid level in the reservoir must be checked every 6,000 mi (9,700 km) or semiannually, whichever occurs first and topped off
using HUMMER H1 Synthetic Gear Lube 75W-90 with friction modifier. Remove the fill plug when the unit is cold and ensure
that the fluid is even with the bottom of the fill plug hole  (Figure-1-27). The coupler shaft CV joints must be greased every 6,000
mi (9,700 km) or semiannually, whichever occurs first with a multipurpose, NLGI-LB grade chassis grease. The coupler shaft has
a CV joint at the GFD end and one at the engine crankshaft end. Each CV joint contains two grease zerks, although only one zerk
needs to be greased per joint. The second zerk is used to give an optional location depending on the position of the shaft when the
engine stopped. This should lessen the need to bar the engine over to gain access to the zerks. Grease should be applied, using a low
pressure grease gun, to the joint until old grease can be seen exiting around the sleeve on the shaft. Wipe the excess grease from the
shaft when finished (Figure-1-28). 

NOTE: It will be normal for some grease to exit the CV joint seals during engine operation, DO NOT replace the CV joints for this
condition.

Figure 1-27:   GFD Fill and Drain Plug

FILL

PLUG

DRAIN

PLUG

GEARED

FAN DRIVE

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General Information, Lubrication and Maintenance

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Figure 1-28:   Coupler Shaft Grease Points

Universal and Slip Joint Lubrication

Lubricate U-joints with a multipurpose, NLGI-LB grade chassis grease.

Lubricate propeller shaft universal and slip joints every 6,000 mi (9,700 km), or semiannually, whichever occurs first. Use a hand
operated or low-pressure air powered lubrication gun. If operating conditions are severe service at 1,000 mi. (1,600 km) intervals.

The rear propeller shaft U-joints have two grease fitting locations (Figure-1-29). The front shaft has four fitting locations (Figure-1-30)

Figure 1-29:   Propeller Shaft Lube Points

GREASE

ZERKS

GREASE

ZERKS

U-JOINT LUBE FITTINGS

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Figure 1-30:   Front Propeller Shaft Lube Points

Steering and Suspension Lubrication Points

Lubricate steering and suspension components every 6,000 mi. (9 700 km), or semiannually, whichever occurs first. If operating
conditions are severe, service at 1,000 mi. (1 600 km) intervals.

Figure 1-31:   Ball Joint/Radius Rod Lube Points

Suspension lube points include the upper and lower ball joints and the rear suspension radius rods (Figure-1-31). Steering lube
points include the tie rod ends, idler arm, steering arm, and intermediate steering shaft ( Figure 1-32  through  Figure 1-34).

Use a hand operated or low pressure air powered lube gun filled with a multipurpose chassis grease. NLGI-LB classification lubri-
cating grease is recommended.

LUBE FITTING

LOCATION

LUBE FITTING

LOCATION

RADIUS ROD
LUBE FITTING

UPPER BALL

JOINT FITTING

LOWER BALL

JOINT FITTING

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