> From Jeff Baudin
> Time/Date 02:22 PM 12/10/97.
> 
> 
> 
> Recently many have posted where all the grease nipples are located. Has
> anyone put together a picture that shows where these are? Is it in the
> service manual and I've just missed it?
> 
> I think a picture would make doing this a lot easier.
> 
> Jeff

Jeff:

There is a diagram (sort of) in the owner's manual. It shows many of the grease points, but not clearly where they are located on the truck. It may be of some help. It is the only diagram that I know of.

Here are some general guidelines, and how they apply to the Hummer:

Ball-type joints:

• 8 ball joints
• 4 tie rod ends
• 1 idler arm
• 1 steering arm
• 2 radius arm ends

U-Joints:

• 3 in front drive shaft
• 2 in rear drive shaft
• 2 in steering column

Slip / expansion type joints:

• 2 in front drive shaft
• 1 in steering column (not all Hummers)

Pivot / hinge type joints:

• 1 gas pedal pivot (NA Diesel and gas only)
• 1 idler arm (near frame)
• (the radius arms have this type of joint on one end, but they are not greasable in the Hummer)

Now, for some Hummer-specific suggestions: (BTW, mine is a '95)

The geared hubs are attached to the Hummer chassis in three places:

1. Upper ball joint (grease fitting)
2. Lower ball joint (grease fitting)
3. Steering linkage (front), or radius arm (rear) (grease fitting)

In the front, the steering linkage is composed of three primary pieces. These pieces form a continuous linkage between the two front hubs, and are used to steer the Hummer. These pieces are: 1,3) Tie rods (grease fitting at each end, total of 4 fittings)
2) Center link (no grease fittings)

The center link is attached to the truck in two places:

1. Steering arm (a.k.a. Pitman arm) (driver side) (grease fitting at center-link end)
2. Idler arm (passenger side) (grease fitting at each end)

In the rear, the radius arms look very much like the tie rods, except that they are fastened to the frame (instead of a center link). The ends of these arms at the geared hub have grease fittings. The ends at the frame do not.

Front drive shaft:

The front drive shaft is in two sections. There is a u-joint in the middle, and at each end. All three u-joints have a grease fitting. In addition, the front drive shaft has two "sliding parts" that allow the two shaft pieces to change length. Each of these parts has a grease fitting. It will be located on the side of the drive shaft, right where the shaft changes diameters. CAUTION: do not over-fill these fittings - too much grease will prevent the shaft from becoming shorter!

Rear drive shaft:

The rear drive shaft is a single, solid piece, with a u-joint at each end. These two u-joints both have grease fittings.

Steering column:

The steering column (the steering shaft actually) has two u-joints in it. One is located a few inches from the steering wheel (under the dash). The other is located near the steering gear, under the hood (within about a foot of where the steering shaft passes thru the fire wall). The steering shaft also has a "sliding part" which allows the shaft to change length. This joint is located near the u-joint inside the truck, under the dash. Some, but not all, Hummers have a grease fitting here.

Gas Pedal:

On my '95, I had the gas pedal recall work performed. This recall replaced the gas pedal and the linkage. There is now a grease fitting on this linkage, right after it exits the cab, above the driver's right foot. Access to this fitting is from underneath the truck. The turbo Hummers have a different mechanism for the gas pedal, and do not have this grease fitting.

Other places to look:

• Winch (some do, some do not - check your manual)
• "Roller fairlead" rollers (again, some do and some don't)
• Tire carrier pivot point(s)
• Can carrier pivot point(s)
• Swiveling pintle hook

I hope this helps. I know, pictures would be better. Well, if Santa brings me the Digital Camera (hint, hint Santa), I would be happy to provide them.

Dave Breggin
'95 Diesel Wagon