Transmission

dboger

New User
I'm working on a 1939 H ihc the gears are rounded. None have broken teeth. The trans has never before come out of gear. I changed oil in the gear box and the main shaft seal started leaking. I think I need to change seals and bearings but was wondering about gears. In a road vehicle I would be afraid to run these gears. I don't intend in working the tractor again such has plowing may be in a parade and to mow pasture. Slim chance of a tractor ride. What is other peoples opinion on gears for an 80 year old trator?
 
May not find any that are in much better shape and since fiat
cnh doesn’t support equipment that’s 20 years old I highly
doubt they’ll have any new gears for you
 
I would suspect the gears that change from 4th to 5th are rounded.

I do not know about replacement gears.
 
You will probably find that the piece that goes into the front seal is grooved and needs speedy sleeve. What weight of Lubricant did you use?
 
I would not be worried, that's the nature of the design, a crash box with no syncronizers.

As long as there are no broken teeth it will last many more years, especially not being worked.

Keeping the clutch adjusted properly, returning the engine to slow idle before shifting, and keeping the trans oil level full (the oil acts as a brake to stop the spinning quicker), and being patient with the shifting, it will out live most of us.
 
(quoted from post at 07:41:43 07/05/20) You will probably find that the piece that goes into the front seal is grooved and needs speedy sleeve. What weight of Lubricant did you use?
I used 80/90 weght
 

As previously stated . New seals , new bearings , set clearances , new springs ,
New detent balls , 50wt motor oil and good to go .
 
I think it's Steiner Tractor Parts that is having CNC machined billet steel replacement transmission
gears made. Not cheap but not junk. The ends of the gear teeth that engage the mating gear were "Rounded"
during manufacturing. It was an additional set-up on a special machine specifically to help the gears
mesh better. Even the 5th gear direct coupling had the tiniest bit of metal removed to aid engagement.

All too often people operating these old tractors just push the clutch in and instantly try to shift
into gear grinding the teeth. It only takes a second pause to shift into gear without grinding and
eliminate that damage. Not a "Machine defect", it's an "Operator Defect". I was HYPER sensitive about
it, that might have something to do with the fact my Super H that I put most of the hours on after we got
it in May of 1968 and the gears look like new. I was a production scheduler in a gear machining dept for
a year, I know what those gears looked like when new!
 

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