303M HydraMatic rebuild

[rustystud]

That's the problem. The TM only mentions the bushing in one short paragraph .
I knew about the bushing since I rebuilt the HydraMatic transmissions in civilian cars too.

 

[m1010plowboy]

By George I might have this figured out. Is your close-up pic the inside of shaft Q (7411533) ?

That would mean shaft N (7084954) gets shoved inside shaft Q....and the infamous 'slop' occurs between the boy shaft N and the receiver hole in shaft Q.

Is that right?




The description you posted from the TM 9-8025-2 the 301MG and 302M Hydra-matic transmissions manual helped a lot.

Were they sleeved from factory or is that something that happened when they went for maintenance the first time?

 

[rustystud]

Thats the shaft. The bores are already bored out on all the 303M shafts I've seen so far. Though only two where actually to the proper size. The rest I had machined out to the correct size.
So it appears this is a factory problem and not a rebuild problem. Though if the mechanics who rebuilt these transmissions knew of this bushing they would have had them installed I'm sure. Since there is just that small paragraph and little diagram mentioned in "TM 9-825-2" I can see how they would miss it.
That passage the bushing fits into is a "main" pressure galley. All that pressure just "spurting" out around the input shaft would eventually cause severe wear since no pump could keep up with that kind of pressure lose for long. Also the wear on the pump itself. That would also explain the high failure rate of the front pumps on the 303M transmission.