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Sleeve gear bearing movement

Submitted by william_fussell on Tue, 08/03/2022
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Commando

Hello all,

Commando 1970 Desert Sled

I was in the process of replacing the sleeve gear seal and found that the sleeve gear and bearing slide side to side some, a lot to me.  I am guessing this is not normal but I did not see any retainer for the bearing in the parts listings.

So is there a fix for this like using bearing mount to secure it to the case or does it mean it is time for a new case?  Or possibly just new bearings will do the trick?

I attached photos one slid in and one slid out.

Thank you for the help,

Bill Fussell

Arizona High Desert 

Attachments
sleeve gear movement_Moment 1.jpg
sleeve gear movement_Moment 2.jpg

Submitted by peter_holland1 on Tue, 08/03/2022

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Hi Bill,

Are you seeing end float of the sleeve gear? As you pull it out, it will normally abut the inside of the sleeve gear bearing. The bearing should stay still and the sleeve gear slides over the mainshaft and through the bearing inner.

As you push, the sleeve gear will slide the other way until it clonks with the 3rd gear pinion.

When the gearbox sprocket and nut are in place and secured, the sleeve gear will not move through the gearbox bearing at all. It will be clamped solid.

I suggest you replace the sprocket and securing nut and satisfy yourself that the sleeve gear, sprocket and nut are indeed immoveable in and out. All is then well. If there is lateral movement of the sleeve gear in this condition, you do indeed have a bearing floating in the crankcase. I'd suggest this is extremely unlikely.

Peter Holland

 

Hi there Peter,

It is indeed the bearing floating in the case rather than the gear in the bearing.  If you look closely at the photos you can see the difference position of the bearing in the case. 

Any suggestions?  

Thank you sir,

Bill

 

Submitted by peter_holland1 on Wed, 09/03/2022

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The old fashioned fix for a loose bearing was to get a flash of copper plate put on the bearing outer diameter. Hope you find what has caused this.

Peter

Submitted by philip_hannam1 on Wed, 09/03/2022

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Fixing a loose Gearbox main Bearing was a question asked of John Hudson many years ago. His solution being a thin line of bearing fit/lock, inside the bearing housing.

Submitted by dan_field on Thu, 10/03/2022

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Have a look at the loctite web site, there are various different types of bearing lock. I think I used 638 on some main bearings with similar play. 

Dan

Submitted by john_reeve on Sun, 13/03/2022

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Hi before you try Locktite check that the case is not cracked between the two bearings

John

 


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