Topic: Installing rear wheel bearings CB750K4 - Need advice. Left or right first?

[CR125Honda]

Searched without an answer. Could not find an install DIY.. No help in the manuals, Honda or Clymer.

I'm installing new rear wheel bearings in my 1974 CB750.

Just found out after I seated the new right bearing (brake side), when I install the spacer it sits up higher than the seat for the left side bearing.

Looking for someone that know the correct install sequence.

Do I seat the left (sprocket) bearing first, tighten down the retainer, then press the right bearing in until it touches the spacer?

Or... Install right side bearing til it seats, etc....

I'll post a pic in a few minutes. Posting this now to see if I can get a quick reply & finish the project..

Ken

[flybox1]

install the smaller bearing first, and retainer if you wish.  i usually wait till the end in case i need to alter bearing depth.
insert the spacer, small side first, through the larger bearing side.
install the larger bearing.
you'll want very slight movement in the spacer.
dont wedge it between the bearings.
make sure the bearing surfaces are flush, with the hub where necessary.

[CR125Honda]

Both of my "wheel" bearings are the same size, 6304. The sprocket bearing is larger.

Here are some pics to help describe..

Right side bearing installed to it's seat.


Below flush.


Razor blade shows spacer height above left side seat when sitting on right side bearing.

[CR125Honda]

Think I may have figured this out (with flybox's help)..

With the right bearing pressed in to it's seat, I put the brake plate on the wheel and found while rotating, it would rub the outer edge of the drum. It should be resting on the right bearing. It didn't seem right.

Fortunately here is enough room on the outer race of the right bearing for me to tap it (thru the wheel hub) back out  a 1/4' or so.

Plan is to then install the spacer, install the left bearing til it seats, install the retaining ring, then tap the right bearing down til it touches the spacer again.

Ken

[Bodi]

The wheel position is set by the bearing with the retainer ring. The other bearing floats in its bore, and gets forced against the spacer when you tighten the axle nut. You may have some rotating friction at first, but unless the bore is super tight on the floating bearing it will self-align after some riding.
Seat the retained bearing fully (use a tool that only hits the outer race). Tighten and stake the retainer ring. Slip the axle through the bearing, put the spacer on the axle, put the floating bearing on the axle. The axle helps align the bearing in the bore so it doesn't get jammed crooked. Tap the bearing in with the same outer ring tool, supporting the rim not the end of the axle.If you can push up on the axle with one hand white tapping with the other, stop when you feel the tapping in the axle: that means the bearings are aligned.

[CR125Honda]

Project complete..

For anyone else that searches "installing rear wheel bearings" or similar, for a CB750 and could not find a reply -

The correct sequence is -

Install left (sprocket side) bearing first.
Install retainer ring.
Install spacer.
Install right bearing - pressing it in until it just touches the spacer.

Install bearing / retainer ring in sprocket hub.

Ken

[grepper]

I just did this last week, I put the axle through so the spacer stay lined up.  I also used an old head bearing race that had a lip the just touches the outside edge of the bearing, so when I tapped it in, one side then the other, the pressure was just on the outside edge.  You don't want to put any pressure on the inside or the seal, just the outer edge of the bearing.