GMC netters - I am working with a coach owner off-line, and she has posed
this question:
>Now for my question I hope I put it across right. I have 2 operating
manuals
>one is 7521A the other is 7821A I am guessing that one came out for a 1975
>and the other in 1978.
>For front wheel bearings 75 says (bearings sealed) replace if bad.
>78 says if wheel bearings bad replace if not repack with grease.
>From everything I had read everything refered to all wheels needing to be
>repacked at x amount of miles.I was assuming all 6. When I checked at a RV
>place who has his fathers 73 there they did his bearings and said you don't
>repack front as they are sealed. What is right sealed or not sealed for
>front. Did they make a change at some time ? Hope you understand what I am
>asking. Oh and also what kind of a chore is it to repacking only the back
>wheels do you need special tools? That's all for now .
I was able to handle the question re. repacking the rears, but this is the
first I've heard of sealed front bearings. I do have the 1977 owners
manual, and it mentions servicing the rears, but no mention of the front!
I also have the Maintenance Manuals & Supplements X-7725, X-7525A, & X
7525B. I find mention of cleaning, replace, or repacking the rears, but for
the front, I only find "Replace every 24,000 miles".
Were there model years that did have sealed non-serviceable bearings, that
are only replaced and not repacked? If so, when was the change made? I
just received a matched set from Cinnabar for my 1977, and they are not
sealed.
TIA for your help.
Chuck
77 Kingsley
North Idaho
this question:
>Now for my question I hope I put it across right. I have 2 operating
manuals
>one is 7521A the other is 7821A I am guessing that one came out for a 1975
>and the other in 1978.
>For front wheel bearings 75 says (bearings sealed) replace if bad.
>78 says if wheel bearings bad replace if not repack with grease.
>From everything I had read everything refered to all wheels needing to be
>repacked at x amount of miles.I was assuming all 6. When I checked at a RV
>place who has his fathers 73 there they did his bearings and said you don't
>repack front as they are sealed. What is right sealed or not sealed for
>front. Did they make a change at some time ? Hope you understand what I am
>asking. Oh and also what kind of a chore is it to repacking only the back
>wheels do you need special tools? That's all for now .
I was able to handle the question re. repacking the rears, but this is the
first I've heard of sealed front bearings. I do have the 1977 owners
manual, and it mentions servicing the rears, but no mention of the front!
I also have the Maintenance Manuals & Supplements X-7725, X-7525A, & X
7525B. I find mention of cleaning, replace, or repacking the rears, but for
the front, I only find "Replace every 24,000 miles".
Were there model years that did have sealed non-serviceable bearings, that
are only replaced and not repacked? If so, when was the change made? I
just received a matched set from Cinnabar for my 1977, and they are not
sealed.
TIA for your help.
Chuck
77 Kingsley
North Idaho
