B275 Hymatic type s15 linkage control and isolation

[TwoShortPlanks]

Hi, I am hoping some of you knowledgeable foke can assist me.

I have a b25 with a Hymatic type s15 linkage control and isolation. It is badly leaking round the isolation valve.

I have tried replacing the o rings with "best fit" from my generic box of of o rings. This worked ok for about a 10hours of workthen failure .

I have tried to locate a o ring set but from a couple of vintage tractor people and they only seem to have parts for a varimattic (from memory) block, which I think was on slightly later models.

I have tried measuring and selecting a series of o rings from bearingboys. ok for about 20hours of work now failure again. I measured OD and ID of surfaces and then selected a O ring that was a little bigger / smaller.

I am getting to my whits end as it's such a simple thing causing much hassle.

Does anyone have a good source of part for Thai block or know if anyone? I have e tried tractor parts.co.uk and one other place I forget off the top of my head neither was able to help unless it was a varimattic.

Alternatively does anyone have a good method of sizing unknown o rings sizes?

 

[TwoShortPlanks]

Edit: vari touch valve (NOT varimattic as in my post) is the valve everyone seems to offer parts for whiles mine is hydomatic

 

[Tractortech]

Now Then...
In order to get maximum help here, it's a good to include maximum information in your question/post..
I may be a little bit 'slow' here,,,,,, but just exactly what is your 'B25'?? (Tractor/plough/loader/bomber/etc)
Also, what make, age and hours would help others to assist you..

 

[AftonShepherd]

Now Then...
In order to get maximum help here, it's a good to include maximum information in your question/post..
I may be a little bit 'slow' here,,,,,, but just exactly what is your 'B25'?? (Tractor/plough/loader/bomber/etc)
Also, what make, age and hours would help others to assist you..

Although post says B25, title says B275

 

[TwoShortPlanks]

Ahh sorry slippy fingers. Yes IH b275. 1959 I believe. Hours, well replacement cable is on todo list shamefully.

 

[reinger32]

Hi, I am hoping some of you knowledgeable foke can assist me.

I have a b25 with a Hymatic type s15 linkage control and isolation. It is badly leaking round the isolation valve.

I have tried replacing the o rings with "best fit" from my generic box of of o rings. This worked ok for about a 10hours of workthen failure .

I have tried to locate a o ring set but from a couple of vintage tractor people and they only seem to have parts for a varimattic (from memory) block, which I think was on slightly later models.

I have tried measuring and selecting a series of o rings from bearingboys. ok for about 20hours of work now failure again. I measured OD and ID of surfaces and then selected a O ring that was a little bigger / smaller.

I am getting to my whits end as it's such a simple thing causing much hassle.

Does anyone have a good source of part for Thai block or know if anyone? I have e tried tractor parts.co.uk and one other place I forget off the top of my head neither was able to help unless it was a varimattic.

Alternatively does anyone have a good method of sizing unknown o rings sizes?

While Hymatic may not be actively producing parts for this specific model anymore, they might be able to point you towards a distributor with old stock or recommend a suitable replacement.

Look online for service manuals or parts diagrams for your B25 Hymatic S15. These resources might list the specific o-ring size or part number. Try searching for "[B25 Hymatic S15 parts manual]" or "[B25 Hymatic S15 service diagram]".

Look for companies specializing in hydraulic parts for vintage machinery. They might have the specific o-ring or be able to identify it based on your measurements.