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Old 12-05-2020, 09:07 PM   #1
Bob from Northport
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Default Generator question

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??
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Old 12-05-2020, 09:38 PM   #2
GRutter
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Default Re: Generator question

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
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File Type: pdf ModelAGeneratorAssy-7018.pdf (154.9 KB, 43 views)
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Old 12-05-2020, 10:14 PM   #3
Bob from Northport
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Default Re: Generator question

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
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Old 12-05-2020, 10:17 PM   #4
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Default Re: Generator question

Here is a photo
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Last edited by Bob from Northport; 01-24-2022 at 09:39 PM.
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Old 12-05-2020, 10:21 PM   #5
GRutter
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Default Re: Generator question

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.
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Old 12-05-2020, 10:22 PM   #6
Bob C
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Maybe the retaining ring behind the bearing has moved.
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Old 12-05-2020, 10:25 PM   #7
GRutter
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Default Re: Generator question

Those rings are not spring steel.. just a maleable ring. It very likely just came out of it's groove and slid backwards.
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Old 12-05-2020, 10:43 PM   #8
Purdy Swoft
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Default Re: Generator question

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 .
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Old 12-05-2020, 10:53 PM   #9
David R.
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Default Re: Generator question

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.
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Old 12-05-2020, 11:32 PM   #10
Bob from Northport
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Default Re: Generator question

Thank you all very much. We'll see on Monday
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Old 12-08-2020, 05:20 PM   #11
Bob from Northport
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Default Re: Generator question

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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