Tw15 valve stack

[JAC FARMING]

Tw15 series 1 has blown the orimgs between the hydraulic remote valve stacks twice this year. What would cause the issue. Figured maybe old orings sitting on the shelf from cnh too long? But twice

 

[TheOldHokie]

Tw15 series 1 has blown the orimgs between the hydraulic remote valve stacks twice this year. What would cause the issue. Figured maybe old orings sitting on the shelf from cnh too long? But twice

Improper assembLy? Warped or damaged valve body or cover?

A little more history might help - e.g. did this start on its own or after work was performed? How many orings and where?

TOH

 

[Jim.ME]

Are the replacement O-rings the correct material and durometer?

 

[Bern]

Tw15 series 1 has blown the orimgs between the hydraulic remote valve stacks twice this year. What would cause the issue. Figured maybe old orings sitting on the shelf from cnh too long? But twice

About the only thing I can think of other than defective or wrong orings would be either improper torque sequence of the cover, or else the pressures are in excess of rated specs. For the latter to happen there would have to be a stuck closed relief valve, which is pretty much unheard of. Easy to check for though, just stick a pressure gauge in any remote coupler and pull the handle back. Going from memory, you shouldn't see much more than 2500 PSI.

 

[JAC FARMING]

I replaced them about 2 years ago when i put a new hydraulic pump and rebuilt the pto. They lasted till this spring where the blew out spraying oil everywhere. And they just did it again. I would like to put a gauge on but i cant use either remote as it sprays oil everywhere from both levers. I used grease to hold the orings in place to reassemble.

 

[TheOldHokie]

Sounds likre that valve stack has more thsn oring problems....

TOH

 

[JAC FARMING]

Sounds likre that valve stack has more thsn oring problems....

TOH

Thats what im trying to figure out…

 

[TheOldHokie]

Thats what im trying to figure out…

I dont know squat sbout the TW15 but when a valve leaks like a sieve its usually worn out.

TOH

 

[Bern]

Thats what im trying to figure out…

Start with a pressure check, rule that out.

 

[JAC FARMING]

Start with a pressure check, rule that out.

I would but its blowing oil everywhere which ever remote i use

 

[TheOldHokie]

I would but its blowing oil everywhere which ever remote i use

Where izthe leak? Does it leak if you dont operate the remotes?

 

[paul]

Do these use the o ring and that harder backer ring as well?

Paul

 

[Bern]

I would but its blowing oil everywhere which ever remote i use

Some pictures with arrows drawn in by yourself would be nice about right now.

 

[TheOldHokie]

Do these use the o ring and that harder backer ring as well?

Paul

Those orings are static face seals - no backup rings. Backup rings are anti-extrusion devices intended for dynamic seals.

TOH

 

[JAC FARMING]

Some pictures with arrows drawn in by yourself would be nice about right now.

Its leaking in between the 2 remote valve bodys under the cab. Theres 3 orings per stack and the cover. So when i pull the levers its sprays oil out from where it blew the orings. I suppose ill have to throw another set of o rings at it and take a pressure test. The first set lasted about 2 years the second set lasted about 6 months

 

[JAC FARMING]

Do these use the o ring and that harder backer ring as well?

Paul

Thats for the coupler itself i think your thinking of. My issue is between the valve bodys under the cab where the bolt the stack together. Its leaking between the 2

 

[TheOldHokie]

Thats for the coupler itself i think your thinking of. My issue is between the valve bodys under the cab where the bolt the stack together. Its leaking between the 2

With a leak like tha8t a pressure test is basically meaningless. I also csn't imagine this sort of static seal failure from over pressure. Those seals are pretty stout and I expect something else would probably fail first.

Check the face of the sections for flattess - no more than a couple thousandths out.

Check the glands for damage.

Check the tie rods and threads to make sure they are not pulling out under pressure.

Check the protrusion of the new orings when installed in the glands. Depending on the cross section of the o-rings it should be .010 or more.

Cast iron sections are also easily cracked if they are clamped down unvenly - e.g with contamination on the face or when warped.

TOH