| Re: [GMCnet] Good luck or Bad Luck??? (long) [message #92690] |
Tue, 20 July 2010 12:47  |
Bruce
Messages: 18
Registered: February 2004
Karma:
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Junior Member |
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I put in all new bearings when I bought the coach ... however I guess that
was 10 years and 45k miles ago...
Guess what is getting replaced this weekend?
Bruce
In a message dated 7/20/2010 9:39:44 A.M. Pacific Standard Time,
emerystora@mac.com writes:
Bruce
You have now found out that the "Old Wobble Test" is meaningless. The
only way to check the rear wheel bearings is to remove the hubs and check the
bearings. You don't say when they were last repacked. Do you know when it
was?
The GMC Maintenance Schedule and Maintenance Manual says that you should
clean and repack them every 24,000 miles. Part of the reason for this is
because the rubber seal on the inside bearing wears and will begin to allow
the entry of water into the bearing.
Over the years I have made it a point to repack mine at about that
mileage. I was planning to do it right after the GMCMI Spring Convention this
year but I have to go to Denver because of my daughter's broken leg. So I
finally got around to doing it last week. I had about 28,000 miles since the
last repack. Three of the wheels looked fine. The Mobil 1 grease was
still bright red except for a very thin film of it just inside the seals.
However on one wheel I found that the outside bearing had some severe
"etching" on two of the rollers and there was etching in one spot on the cup. This
could easily have led to a bearing failure on my next trip which is
planned to be about a 5000 mile round trip.
There was no sound, overheating or any other symptom of this. I have seen
or heard of several people losing their rear wheel and I sure don't want
it to happen to me. It usually takes out the spindle as well as the
bearings and possibly even parts of the fiberglass body and this involves major
work and expense to replace. Much easier to do preventative maintenance and
be safe.
Emery Stora
77 Kingsley
Santa Fe, NM
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