Remote Hose Has Slow Leak - Fixable??

[wjb-49]

Hi everyone!

Well, here I am again with another crazy problem on my Ford 4610. For some time I have noticed a slow fluid leak at the coupling on one of my hydraulic remotes. We thought it could be a defective quick-connect coupling and removed the coupling, it continued to slowly leak. I downloaded the parts list and diagram from New Holland and now realize finding the problem could be a very tough job.

Dose anyone have a suggestion for diagnosing this leak or what the most common problem is?

Thanks for any suggestions!

 

[Jay4200]

You'll likely have to replace the coupling. Or, you could just let it dribble and put a cup under it when you park. That's what I would do

 

[bigbull338]

my brain is old an slow so not sure if i understand what your saying but lets see.1 of your hydro remotes is leaking.if so you can get new guts from your NH dealer to fix it.the guts cost about $60 ea.you prolly want to change both of them.if you dont think you can change them out the shop can do it for you.

 

[Zebrafive]

Two ideas to diagnose the leak:
1 get a male quick coupler, put a plug in the end of the coupler and install in the female quick coupler.
2 remove the female quick coupler and install a plug in it's place.

Then see if the leak is gone.

 

[wjb-49]

Thanks to all of you for your replies.

I may have not been clear in my OP - I have removed both couplings (female) and one of the remote hoses continues to leak. Could the problem be in the control valve? If that is the most likely source of the problem, is a rebuild kit available (o rings, etc.) and is a rebuild a big job?

 

[Tx Jim]

Only repair that can be performed on a spool valve is external leakage. Internal leakage requires replacement of spool & valve body as a set.

 

[J_J]

Exactly where is the leak?

spool shaft

valve port

hose fitting

 

[wjb-49]

The leak is at the quick-connect end of one (it appears to be only one) of the remote hoses. We removed the quick-connects to check if the leak continued, and it does. This occurs with the remote control valve turned off. I tied a plastic bag around the ends of the hoses and after about three hours of operating the tractor the bag has approx. 1/2 cup of fluid in it.

Thanks.

 

[J_J]

The QD is probably attached to an NPT fitting.

NPT fittings are not designed to be used many many times, because the threads deform with each use.

If the fitting has not been used a lot, then I would use pipe dope on the threads and tighten it up and recheck. If the QD and fitting still leak, then replace the QD and the fitting.

With the valve in neutral, there should be no pressure on the QD, except the pressure caused by increase temp.

If you think the valve work ports spools are leaking, a good QD should stop all fluid flow.

 

[wjb-49]

The QD is probably attached to an NPT fitting.

NPT fittings are not designed to be used many many times, because the threads deform with each use.

If the fitting has not been used a lot, then I would use pipe dope on the threads and tighten it up and recheck. If the QD and fitting still leak, then replace the QD and the fitting.

With the valve in neutral, there should be no pressure on the QD, except the pressure caused by increase temp.

If you think the valve work ports spools are leaking, a good QD should stop all fluid flow.

This may sound like a totally dumb question: If I replace the leaking QD with another and the leak stops, if it is continuing to leak from the valve, would it not eventually fill the hose and cause a problem? I'm thinking the hose would eventually completely fill with fluid and cause a problem at the valve end of the hose.

Thanks for your reply.

 

[Tx Jim]

The hose is filled the moment you move the valve lever to operate a hyd cylinder. If after replacing QD leak persists then there's a problem with the hose or hose fitting.

 

[wjb-49]

The hose is filled the moment you move the valve lever to operate a hyd cylinder. If after replacing QD leak persists then there's a problem with the hose or hose fitting.

I may have not been very precise about the leak, it leaks when the control lever is in off position when no equipment is connected to the QD. Therefore, it leaks at any time the tractor is operating. As I said in an earlier post, we removed the QDs to determine if they are the problem or if the control lever\valve is the problem and it leaks with the QDs removed. Sorry if I was not clear about the problem.

Thanks.

 

[Tx Jim]

You were very clear in your statement. I must not be answering your question very well. Once the hose in question is filled with oil being it oil from operating a cyl or valve leakage the oil stays in hose unless it "leaks out". If valve leaks internally when QD is good and you still have a leak replacing hose or stopping threaded area from leaking are your only choices to fully stop leak.

 

[wjb-49]

You were very clear in your statement. I must not be answering your question very well. Once the hose in question is filled with oil being it oil from operating a cyl or valve leakage the oil stays in hose unless it "leaks out". If valve leaks internally when QD is good and you still have a leak replacing hose or stopping threaded area from leaking are your only choices to fully stop leak.

Are you saying there is no way to repair the valve if it leaks internally?

Thanks for your patience with my questions!

 

[Tx Jim]

YES there's no way to repair an internal leak on a spool type valve. The sppol & valve housing are a machined fit and once either one or both components have wear then it's time for replacement of complete valve .Some external leaks can be repaired

 

[wjb-49]

YES there's no way to repair an internal leak on a spool type valve. The sppol & valve housing are a machined fit and once either one or both components have wear then it's time for replacement of complete valve .Some external leaks can be repaired

I may begin looking for a "recycled" valve and hope it does not also leak. If I choose to replace the QDs, will the internal leak cause a problem?

Thanks.

 

[Tx Jim]

No the only thing the internal leak could do is cause cylinder rod if cyl is attached to QD to extend or retract depending on what part of spool was internally bypassing

 

[Tx Jim]

No the only thing the internal leak could do is cause cylinder rod if cyl is attached to QD to extend or retract depending on what part of spool was internally bypassing. Do you ever use the rear remotes on your 4610??

 

[wjb-49]

No the only thing the internal leak could do is cause cylinder rod if cyl is attached to QD to extend or retract depending on what part of spool was internally bypassing. Do you ever use the rear remotes on your 4610??

Only occasionally. Primarily to mow hay.

 

[J_J]

wjb-49 , You said:

This may sound like a totally dumb question: If I replace the leaking QD with another and the leak stops, if it is continuing to leak from the valve, would it not eventually fill the hose and cause a problem? I'm thinking the hose would eventually completely fill with fluid and cause a problem at the valve end of the hose.


Don't think so.

You can observe if your valve spools are leaking by removing the work port hoses and see if any fluid comes out the work port with engine running.

Do not touch the levers with hoses removed from the work ports.