Case Ih 1255 synchro help needed

banjo

Member
Location
Back of beyond
Just a question, in the book it sais 8 litres of gear oil in the back axle, is that one side ( 16 litres total in both sides )
Or is it 4 litres in each side 8 litres in total, it was a bit confusing in the book so I have done the latter, any idea ?
 

big ag

Member
Just a question, in the book it sais 8 litres of gear oil in the back axle, is that one side ( 16 litres total in both sides )
Or is it 4 litres in each side 8 litres in total, it was a bit confusing in the book so I have done the latter, any idea ?
I have a Marshall 100 with a similar zf back end and it took nearly 8ltrs each side up to the level plug
 

banjo

Member
Location
Back of beyond
I have a problem fella's and its doing my head in.
Both the rear trumpet housings are leaking oil out of the little hole underneath the bearing in the wet part of the housing into the dry part.
I've put new seals in and it's still doing it.
You have the dry part where the drum brakes and handbrake pads are then a seal, then a bearing. The wet part that has the sun gear in holds 8 litres of oil and the seal is suposed to stop it at the shaft from entering the brake assembly, but it isn't, it is running through the bearing and out of the drain hole into the brakes until the level has dropped below the shaft !
I've replaced the seals and it's still the same, I'm flummaxed on it, anyone else had this problem !
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
You’ve mentioned the level and quantity before, does it actually need to be above the shaft? You’re usually aiming for a 1/3 full minimum to 1/2 full max as a rough guide for any gearbox. Could it be overfilled?
 

Mursal

Member
The trumpet where the oil is will have a vent at the top, its more than likely blocked.
So any change in temperature pressurizes the casing and the seals have no chance keeping the oil in.
But I don't know where the breather is on the trumpet of an international, some of the other members will know.

Usually oil level will be just below the bottom edge of the oil seal.
So the seal really only has to deal with splash

Hope this helps
 

banjo

Member
Location
Back of beyond
You’ve mentioned the level and quantity before, does it actually need to be above the shaft? You’re usually aiming for a 1/3 full minimum to 1/2 full max as a rough guide for any gearbox. Could it be overfilled?

Yes that's origionally what I thought I was doing, the book said 8 litres, I filled one side with 8 litres and it's dead on level with the level plug and a chap replied before saying he thought 8 litres was correct.
I put a camera in the one side today and the oil level has dropped below the shaft ( I'd imagine through the bottom of the bearing drain hole )
New seal on today exactly the same dripping oil out the hole at the bottom!
Trouble is when it does this the oil smeared all over the brakes and covers the drum so they dissapear, no footbrake at all !
Any ideas !
 

banjo

Member
Location
Back of beyond
The trumpet where the oil is will have a vent at the top, its more than likely blocked.
So any change in temperature pressurizes the casing and the seals have no chance keeping the oil in.
But I don't know where the breather is on the trumpet of an international, some of the other members will know.

Usually oil level will be just below the bottom edge of the oil seal.
So the seal really only has to deal with splash

Hope this helps
Do you think it's possible I've got the outer wet trumpet housings on upside down? I'm sure they are correct but the vent hole is deffo on the bottom.
When I had them delivered they were all apart on a pallet so I might of made a mistake.
I'm sure I put then on correctly but I will look tomorrow, you got me thinking now !
 

Mursal

Member
No I'm sure you are correct, there will need to be a hole at the bottom of the brake casing to let any oil the leaks out. Hold tight for others to comment to see where the wet part of trumpet is vented
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
Yes that's origionally what I thought I was doing, the book said 8 litres, I filled one side with 8 litres and it's dead on level with the level plug and a chap replied before saying he thought 8 litres was correct.
I put a camera in the one side today and the oil level has dropped below the shaft ( I'd imagine through the bottom of the bearing drain hole )
New seal on today exactly the same dripping oil out the hole at the bottom!
Trouble is when it does this the oil smeared all over the brakes and covers the drum so they dissapear, no footbrake at all !
Any ideas !

Was there any markings on the shaft where the seal runs? Any visible damadge to the old seal? Doesn’t really make sens does it.
 

Gapples

Member
Seems an odd one, any chance you can post a few photos of the seal set up & the shaft ?
I have had a couple of these apart but that was probably 30 years ago & only to sort the brakes, replaced the seals but can't remember any issues afterwards
 

Gapples

Member
Seems unlikely that both sides would be damaged and leaking?
I can take a photo of my trumpets if that any use?

If both are leaking something's not right, have you tried the seals on the shaft for size before assembly ?
Any photos or info may help us & bango get to the bottom of the problem.
 

banjo

Member
Location
Back of beyond
The seal is in the correct way, I'm sure it's something I've done wrong because it's on both sides, or the oil level is to high 4 litres not 8 litres a side ?
I will post a few picks later if I can, cheers for your advice fella's as this has got me stumped !
 

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