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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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 02-17-2002, 05:49 Post: 35660
TomG

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 hydraulic fitting size

I've got a question, and I'd be very surprised but also very happy if anybody has a definite answer. The question is what are the size and threads on an elbow fitting between the priority valve and the power steering line? The dealer has a part number but the parts guy doesn't know the size and threads. It seems a shame to order a NH part when a generic fitting probably would work.

What I actually need is a t-fitting so I can hook a hydraulic gauge into the PS line. The elbow is just a backup, because I learned some hard lessons as a kid. My rule is 'never remove a fitting unless there's a new one handy.' I guess a related rule in this would be: 'don't even pick up a wrench until there is certainty that the gauge or adapter also will go onto the t-fitting.

Well, guess I can order the elbow and t-fitting from NH (there's a part number for the t-fitting as well). I still wouldn't know if the threads on a gauge or available adapter would go onto the t-fitting. Nothing's easy I guess, and I don't imagine that I can order the gauge from NH as well. I planned to use a welding bottle gauge.

I need to do this in order to adjust the relief valve on my PS. At least that's the simplest version of what the problem might be. Fortunately the steering is adequate until I start doing heavy loader work, and it will at least be warmer then.






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 02-17-2002, 09:56 Post: 35665
Roger L.



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 hydraulic fitting size

Tom, the welding gauge will work, although I use a fluid-damped one myself.
As for the threads, fluid thread types is a universe all its own. There are lots of competing "standards". For example, even though there is a metric thread specifically for tapered pipe fittings, it is rarely used. Instead, many of the Japanese manufacturers are still using the old British Standard Tapered Pipe specification complete with the 55 degree included angle and with the pitch in "threads per inch"!
I haven't the slightest idea what the European metric manufacturers use. BTW, where was that NH loader made? Last I looked, some of European fluid containment mfg. was using an ultra fine metric thread not found anywhere else except for aviation.
Bottom line on hydraulic fittings is either get ready to do a lot of self-education or just buy the part.






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 02-18-2002, 05:01 Post: 35687
TomG

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 hydraulic fitting size

Roger: Thanks for the reply. I think I've reconciled myself to buying the fittings from NH for the reasons you gave. For those reasons, I also don't really blame the dealer for not being able to identify the threads.

The main part is a t-fitting adapter that allows a gauge to be hooked into the PS line. Unfortunately, I probably can't solve the problem of hooking the gauge to one of the t-fitting legs until I actually get the fitting. It'll probably remain a mystery to be solved by self-education.

I'm guilty of not being too clear. My problem is the PS rather than the loader. It's fairly weak and pulses when turning the wheels while the tractor is stationary. There is a manual procedure for adjusting the PS relief valve, which might be the problem, but a gauge is required to set the correct pressure. The priority valve is another possibility, but I'd probably need a gauge for testing it as well. I'm reluctant to increase the relief valve adjustment without a gauge, because I might end up disguising a mechanical steering problem with abnormally high pressure.

Of course, I could be wrong and all sorts of ways of sorting out the problem may be common that don't require testing. I appreciate all advice I receive. Thanks.






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Discussion Boards > Active Subjects > Messages as Posted > Tractor Engine Repair Rebuild Forum

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