How to adjust worm gear - 1999 Chevrolet C/K 2500

Question edited for clarity.
Question move from Spanish car company 'Seat' category.

You can't adjust manually because they work on cogs and worm gears. Lots of help in the link. It seems to be a known issue.

https://www.google.com/search?q=2006+chevy+impala+lt+driver+seat+not+working

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I can't tell you the exact process but I can offer a few pointers.

A complete adjustment of a steering box is almost as complex as a lot of other gear work including the rear axle - much of the technique and technical principle is similar. A complete adjustment should not be undertaken lightly by the inexperienced. Careful examination of the components and accuracy of adjustment is essential.
Adjusting a worn steering gear can be counter-productive as the finished item can have "tight" spots resulting in over-correction of the steering by the driver with the characteristic weaving along the road.

A selection of shims will be needed, some (homemade) special tools, an accurate spring balance or a very accurate torqometer covering the range of 0 - about 20 inch-pounds and a repair manual.

There are different types of steering box - recirculating ball, worm-and-peg, worm-and-segment...
The former is the best but the most complex and is almost exclusively to be found on luxury cars and the latter type is mostly found in the vintage car parc and the worm-and-peg type is probably the most commonly found.

Mostly people only wish to adjust the "lash" of the steering gear to eliminate the free play at the steering wheel and the typically vague feel.

Many steering boxes have a screw and locknut on the cover in order to adjust the lash and preload the peg and worm, etc. but if significant wear has taken place, the steering will be too stiff in operation and the lash will still be present. For the inexperienced it is important not to use the "trial-and-error" method of adjustment but to disconnect the steering drag link and to make the adjustment while checking the preload using the prescribed method at the steering wheel.

For steering boxes without the adjusting screw it will be necessary to remove the cover and to select a shim to remove in order to adjust the lash.

As a matter of interest, excess lash is often caused or partly caused by the steering box retaining bolts loosening or the chassis weakening due to fatigue cracking or rusting. Closely inspecting the area of the mountings while an assistant loads the steering by turning the steering wheel left and right fairly rapidly by between a quarter and half a turn.

I hope this helps.

These will come out once you remove the bolts for the adjusters/ centralizers. Best doing it out of the vehicle.

The best thing to do is to go to Ford and bring your Gear. They are color coded (Blue, White, Yellow, Green, ect....). They are listed under the Transmission parts.... Knowing the name is not going to help you but the parts are replaced on a regular basis and they know the # at the Parts Counter... Just bring yours in and they are in stock at almost ALL dealerships.... Match it up and walk out,..

It's not a worm gear,just a small gear on the motor and a long
metal gear an the regulator. They are riveted in,if the door panel
cracked or a rivet came loose the gears may have slipped,have to
pull the door panel to see.

Yes there are Pitman shaft over-center preload and worm thrust bearing preload.There are special procedures and tools needed for both of these and the steering gear needs to be out of vehicle and drained.Hope this helps.

you might need to adjust the window position so everything will line up correctly again

1. THE STEERING GEAR SHAFT ADJUSTMENT TOO LOOSE OR SHAFT AND OR BUSHING BADLY WORN 2 .EXCESSIVE GEAR WORM END PLAY DUE TO BEARING ADJUSTMENT 3.STEERING LINKAGE LOOSE OR WORN. 4.FRONT WHEEL BEARINGS IMPROPERLY ADJUSTED. 5 STEERING ARM LOOSE ON STEERING GEAR SHAFT. 6. STEERING GEAR HOUSING ATTACHING BOLTS LOOSE. 7.STEERING ARMS LOOSE AT STEERING KNUCKLES. 8.WORKING PINS OR BUSHINGS. 9.LOOSE SPRING SHACKLES.THIS IS 9 POSSIBLE CAUSES THAT WILL CAUSE STEERING TO BE TOO LOOSE.

closest I have is 94 explorer. may be similar.




Item Part Number Description 1 3E501 Steering Gear Sector Shaft Seal 2 3524 Steering Gear Input Worm Gear and Rack 3 3647 Steering Gear Worm Ball 4 3523 Steering Gear Ball Return Guide 5 3A670 Steering Gear Worm Thrust Bearing Adjuster 6 — Locknut (Part of 3577) 7 3571 Steering Gear Worm Thrust Bearing 8 3575 Steering Gear Sector Shaft 9 3524 Steering Gear Input Worm Gear and Rack

the seat adjustment motor which is mounted in the foward part of the lower shroud of the seat has two drive worm gears which are made of a heavy coiled spring if either one of these become loose or the drive portion becomes damaged that side of the seat wont drive in either direction