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[date: 2015-09-15]
Today my 9 year old son helped me clean up the steering bolster.
Common problems with the steering bolster is wobbly steering and leaking oil.
Wobbly steering can be caused by a worn worm gear, or worn sector gear. I suppose worn bushings could cause this too but I have not seen instances of this.
Leaking oil is caused by a bad upper oil seal. Some people delay replacing the seal by switching to a thicker oil (90W to 140W) or even a thin grease (corn head grease).
Part numbers:
Worm gear:
Top:
Bottom: