Major gearbox oil into transmission

Timcla · Apr 16, 2019

Hi
My 16 year son has got a 1956 major to learn all about tractors,he s done a good job on it up to now but has noticed the seals on the trumpets are leaking milky oil and the gearbox oil has dropped considerably.
I m guessing it s leaking into transmission oil tank but how many seals can it leak through and is there a way of fixing it without splitting the tractor as that may be too much for his knowledge.
I ve been told it is probably the pot seal but not sure how to identify or fix this and then was told it could be gearbox seal which is more involved.
Can you drain the transmission fluid so level drops then keep topping up with gearbox oil or will this problem need fixing ASAP.
He was hoping to show it in a show in June and is afraid to drive it in case things get a lot worse.
I m no mechanic and my lads 16 but would welcome any advice you can offer.many thanks.

SkipperII · Apr 18, 2019

If Differential oil is going into the transmission, it is the PTO seal, if it is going the other way, it is the upper seal.

To replace the PTO seal, you will need to drain both gear boxes. The rear end holds about 20 gallons if I remember correctly.
You will need to pull the pto shaft back, remove the pto shift cover, remove the pto mounting bolts, pry the gearbox forward, and drop the
back end down. It is heavy, I used to lay on my back and balance it on my knee. Replace the seal,and be sure to replace the large O
ring.

I always cleaned the recess in the rear housing real well with gasoline, and coated the recess with Hi tack, then put the O ring in place.
Put the gearbox up into place, front end first at a slight angle, then tip the rear up, being careful not to knick the O ring, put rearward
pressure on the gearbox by using a round drift in the front or rear bolt holes, and make sure the middle, shouldered bolts go into place
easily, pull them up most of the way before you put in the other 4 bolts, then tighten them all. I used to put the PTO in gear, then put
the shift cover on, aligning the shift fork, reinstall the pto shaft, then shift it out of gear, and make sure the shaft will turn by hand.

To drive it in a parade, probably won't hurt anything, I wouldn't use the hydralics though, there won't be enough oil to cool them.

Timcla · Apr 20, 2019

Hi
Thank you for the info,my son took it for a short drive this afternoon and engaged the pro shaft whilst driving and when he came back we went to check the gearbox oil and when we took the filler but off the oil was rising and overflowing out the gearbox filler hole.we left it an hour or so and the oil level had dropped a little in the gearbox but was still very full.Does this meannits probably the pto seal as opposed to the rear seal if the transmission/gearbox is filling up when pto is engaged?

(quoted from post at 10:21:46 04/18/19) If Differential oil is going into the transmission, it is the PTO seal, if it is going the other way, it is the upper seal.

To replace the PTO seal, you will need to drain both gear boxes. The rear end holds about 20 gallons if I remember correctly.
You will need to pull the pto shaft back, remove the pto shift cover, remove the pto mounting bolts, pry the gearbox forward, and drop the
back end down. It is heavy, I used to lay on my back and balance it on my knee. Replace the seal,and be sure to replace the large O
ring.

I always cleaned the recess in the rear housing real well with gasoline, and coated the recess with Hi tack, then put the O ring in place.
Put the gearbox up into place, front end first at a slight angle, then tip the rear up, being careful not to knick the O ring, put rearward
pressure on the gearbox by using a round drift in the front or rear bolt holes, and make sure the middle, shouldered bolts go into place
easily, pull them up most of the way before you put in the other 4 bolts, then tighten them all. I used to put the PTO in gear, then put
the shift cover on, aligning the shift fork, reinstall the pto shaft, then shift it out of gear, and make sure the shaft will turn by hand.

To drive it in a parade, probably won't hurt anything, I wouldn't use the hydralics though, there won't be enough oil to cool them.

Major gearbox oil into transmission

Timcla

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SkipperII

Well-known Member

Timcla

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