Hydraulic Fitting Style???

   / Hydraulic Fitting Style??? #1  

cannuck

Bronze Member
Joined
Sep 9, 2021
Messages
79
Tractor
M-F 1440
Will ask same on M-F forum, and did so on hydraulic forum...

Need to pull engine and steering cylinder on my 1440V (rusting under chrome plate of ram) so grabbed a JIC 3/8 cap and plug. Duh....they don't quite fit! What standard are the hydraulic fittings made to? BPS???? and if so, why??
 
   / Hydraulic Fitting Style??? #2  
No help here on anything M-F specific, but most cylinders for other USA brands are ORB or NPT.

Here's a size table for ORB, you probably already know the numbers for NPT:

1726715229135.png
 
   / Hydraulic Fitting Style???
  • Thread Starter
#3  
Barely anything in a M-F dealer inventory is any longer made in North America. this tractor was made in Japan 20 years ago.

Best I can tell after spending an hour looking at things is the steering cylinder is 1/4 BSP (i.e. 0.513" x 19 tpi). Assuming that the male flare is on the hose side and female seat on the male thread fitting for BSP fittings.

The fitting taking 12mm tube to steering box looks to be a 45 degree flare with 20 x 1.5 thread. 10mm Tube coming along frame and under engine to hydraulic pump is same apparent flare angle with 16 x 1.5 thread.

I am assuming the flare fittings are some kind of JIS standard, but really look to be 45, not 30something degrees.
 
   / Hydraulic Fitting Style??? #4  
I am assuming the flare fittings are some kind of JIS standard, but really look to be 45, not 30something degrees.
There are 30, 37, and 45 degree variants of flare fittings, between SAE, AN, and JIC. Although I had it all memorized 25 years ago, I honestly can't keep them straight anymore, and usually have to look it up. I think 45 degrees is SAE J512.

No familiarity with BSP stuff, I avoid it as much as possible, as I always need to pull out the dirty paper when I'm faced with anything British.
 
   / Hydraulic Fitting Style???
  • Thread Starter
#5  
My hose supplier sent a very long list of fitting styles and specs, so pretty much verified my BSP assumptions for the steering cylinder. Grabbed some caps and plugs and in they went. Only scary bit was I had to assume the 19tpi thread pitch by using metric equivalent - since none of my thread gauges included 19tpi. Disastrous visit, though. The guy I have dealt with for last 43 years just up and retired!

The 20mm feed line to steering and 16mm to other side was a little more difficult. I was able to buy 16x1.5 and 20x1.5 nuts so just made some HDPE studs that I parted off into cap and plug lengths. These are not so much to stop leakage as to keep dirt out while apart. I still have to figure out how to effectively drain the tank and large lines to tractor hydraulic pump. I will continue to look for the JIS spec for flares, we be pleased if anyone can find it.
 
   / Hydraulic Fitting Style???
  • Thread Starter
#6  
No familiarity with BSP stuff, I avoid it as much as possible, as I always need to pull out the dirty paper when I'm faced with anything British.
This hurts a bit to have to say but BSP probably is accepted by most of the world outside of NA as the prevalent standard.
 
   / Hydraulic Fitting Style??? #7  
This hurts a bit to have to say but BSP probably is accepted by most of the world outside of NA as the prevalent standard.
Yeah, I'd believe it. Even my Italian espresso machine has some BSP fittings in it. Why they go British, and not German, I'll never understand... but there it is!

Whether it's plumbing, mechanics, or electronics, British engineering is full of unnecessary tedium to be avoided at all costs.
 
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