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The steering linkage consists of a steering (Pitman) arm, center link, idler arm, and left/right tie rods (Figure 8-3). The tie rods connect the center link to steering arms on the left and right side geared hubs. The idler arm stabilizes the center link and is attached to the vehicle frame. The steering arm connects the center link to the steering gear.
Steering Linkage Lubricant
STEERING (PITMAN) ARM REPLACEMENT
I just did this on my 1985 HMMWV. You need a ratchet with some sockets and a box end wrench. The only specialized tool I used way a gear puller. It was an old (and probably too small for the job) Craftsman puller with two hooks, a crossbar, and a threaded shaft in the center that you turn with a wrench.
Remove your cotter pins, unscrew the nuts, and pop those suckers off with the gear puller. It will take a lot of force, but I got mine all removed in about 2 minutes each- no damage to the parts, the tool, or my knuckles. This works for removing the pitman arm from the steering box as well. The rest is basic nut and bolt stuff. I used a humongous adjustable spanner for the pitman arm nut since I didn't have that large of a socket.
Make sure when you reassemble that you use all the right hardware. Someone had left a washer off of my HMMWV tie rod which allowed the nut to rotate off a few turns before it hit the cotter pin. This contributed to the 3 inches of toe-in free play I had when I got the truck. Now it has ZERO!
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