Steering Gear

X

xelhan

Member

Hello,

I would like to know what kind of spline is used on the steering shaft marked #25 on the drawing?

I also need the length and size of the square on the sector shaft.

Thanks,
Chris
 

Attachments

Most Gemmer type steering shafts have a very shallow spline to fit the worm. It's only there to align the shaft properly with the worm and in turn keeps the steering wheel positioned correctly. The worm gear is a press fit on the shaft so special tooling must be used to perform a replacement. This would also require a good quality press. The sector shaft is very close to 1 1/8-inch in diameter so the square end is likely near 1-inch but I don't have one apart to check.

There is an early two tooth worm gear that uses a 9 roller type bearing on each end. Parts are not available for these. They have to be replaced with the later type worm and the 13 roller tapered bearings if they are damaged or excessively worn.
 

Thank you rotorwrench!

1.125 dia. seems right for the sector shaft and an inch about right for the square

Interesting regarding the input shaft. Do you know where can I find more information about how to do this job correctly?

Chris
 
I recently replaced the worm while rebuilding my AA steering gear due to rough bearing surfaces. It was quite a job and had I to do it again I would purchase the new worm and shaft assembly. I pulled the old worm with a large bearing puller set up. Lots of alternating heat, sweat, and penetrating oil. It is designed as a TIGHT press fit on a shallow tapered spline that partially cuts its way on.
The problem arises when pressing a new worm on as how to do it without bending the hollow shaft.
Luckily I have a friend with a well equipped shop who enjoys tackling these type problems.
We made a press by welding up scrap:
A heavy pipe with a cap welded on. The shaft with nut installed flush goes in here. We next packed the steering shaft tightly in the center of this tube with dry sand. Then brackets (heavy angle and thick base) were welded to the pipe to support an hydraulic jack to push the worm on. We warmed the worm, careful not to use enough heat to damage temper, and it was still quite a job!
Thankfully it went on without bending the shaft an steering gear is on the truck in fine order now.
 
Last edited:
You must log in or register to reply here.
Back
Top