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Wheel Bearing Adjustment

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Wheel Bearing Adjustment
Wed Feb 18, 2009 7:14 am


Moderator Note. I have moved this subject to the technical form, since it is an important topic. Clifford's note below relates to a thread on the MAK board: http://www.busconversions.com/bbs/index.php?topic=11060.0

Jim

>>>>>>>>>>>>>>>>

Jim, here is the info on adjusting the bearing on a Prevost you can help the guy on the Mak board then delete it here.

raise both wheels 6 inches from the ground then lower vehicle approximately 2 inches to avoid entire weight of the axle being supported by the suspension air bellows and the shock absorbers

To adjust, tighten adjusting nut until the wheel binds, rotate the wheel while tightening so all surfaces are in proper contact.Back off adjusting nut approximately 1/4 to 1/3 turn to assure 0.001inch to 0.007 inch end play and to ensure the wheel turns freely.Replace lock rings and adjust nut dowel pin in one of the holes.The ring may be turned over if necessary to allow more accurate adjustment of bearings.


Tighten lock nut and re check bearing adjustment, this should get the guy going section 13 page 8 from the Prevost Manual

Or someone could post a link for him to this board telling him it's here

thanks Clifford
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luvrbus
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Hi Clifford. Thanks for the information.

This is an important subject. I am gathering some more information. Once that is done, I will make this subject a thread in the tech section and paste both your information and my information.

Jim
Jim Shepherd
Evergreen, CO
'85 Eagle 10 with Series 60 & Eaton AutoShift 10 speed transmission - not at all fancy, but fully functional
Bus Project pages: http://beltguy.com/Bus_Project/busproject.htm
Blog: http://beltguy.com/blog/
Email: jim@eaglesinternational.net (Please email me rather than use the PM process)
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beltguy
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Re: Wheel Bearing Adjustment
Sun Feb 22, 2009 10:18 pm


OK, I have now moved this thread to the tech forum since it has information that is important to Eagle Bus owners.

In the MAK thread (see first post on this thread), the subject of setting wheel bearing came up. The person starting the thread had put preload into the bearing. I discussed the fact that that process was not correct and cited the Eagle manual process:

>>>>>>pasted from the MAK thread>>>>

I just checked my Eagle (model 10) manual. The bearing adjustment is as follows:

1) tighten nut to 100 ft-lb and rotate both ways (sets the races)

2) back off nut completely and re-tighten to 50 ft-lb and rotate

3) back off nut 60 to 90 degrees

4) check for end play "must be in the range of 0.001 to 0.010 inches"

>>>>>>>>>>>end paste>>>>

I added that in truth, most mechanics do not perform step 4). The important point is that there should be some end play in the bearings.

Now for some new material not contained in the MAK thread. As background, I have agreed to write an article for Bus Conversion Magazine on the subject. As a result, I have been doing some additional research. One of the most interesting finds was that there is a quasi industry standard: http://autoam.timken.com/techseries/trb_pages/TRB%20Adjustment%20RP-618.pdf

Also left unsaid in the MAK thread, is the fact that too much end play in the front wheel bearings will quickly kill a set of tires. Even the 90 degree back off may be a bit too much. I would spend quite a bit of time being very careful to get no more than 60 degrees of back off.

If you are going to adjust your bearings, check your manual. I really don't think you will find any different numbers/procedures. The procedure I list above agrees with the Prevost information Clifford listed and the RP-618 "standard". However, it is always good to double check.

Jim
Jim Shepherd
Evergreen, CO
'85 Eagle 10 with Series 60 & Eaton AutoShift 10 speed transmission - not at all fancy, but fully functional
Bus Project pages: http://beltguy.com/Bus_Project/busproject.htm
Blog: http://beltguy.com/blog/
Email: jim@eaglesinternational.net (Please email me rather than use the PM process)
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