Generator question

Bob from Northport

Bob from Northport

Well-known member
We have an AA truck in the shop for repairs. The pulley on the generator had screws(4) holding the pulley together. When I went to remove the pulley, the main shaft in the generator pulley forward about 5/8". It moves back and forth. Anyone have an idea of what the problem might be before we look harder?? Maybe like a front main bearing??
 
Hi Bob -

You didn't mention what year generator, but there should be a retaining ring on the generator armature shaft that stops the armature from moving forward. See attached drawing - part callout 20
 

Attachments

I appreciate the drawing. The AA truck is a 31'. I think the generator is original to the truck. 31 generator. The retaining ring is on the shaft and is visible when the shaft comes forward
 
Bob -
There are two retaining rings... another identical to that one sits directly behind the front bearing, locking the front bearing to the armature.
Look again at the drawing I attached and you will see the rear retaining ring.. also part number 20
The bearing is held captive in the front end plate by the bearing retaining plate.
 
Those rings are not spring steel.. just a maleable ring. It very likely just came out of it's groove and slid backwards.
 
Shims are offered to remove end play in the armature shaft , I think that Bratton offers them . I used them when I overhauled my generators and starters .
 
GRutter has got it. You will need to pull generator apart and replace or re-install that inside #20 retainer. My rebuild kit came with external split rings but I thought the original c clips fit better after I squeezed them together a bit.
 
Mr Rutter and others. You were right, The inner ring was not there. Apparently broke into pieces or fell away. I will order parts tomorrow. Thank you again!!!
 
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