(800) 853-2651
SHOP NOW

JIC hydraulic fittings and wrench sizes

J

JDemaris

Well-known Member
I ought to know this, but I can't remember.

I'm trying to ID some hydraulic hoses on a machine I have parked 1000 miles away. I want to prebuy some spares.

I have an IH tractor/backhoe - 3414 tractor with a 3120 hoe. I took a quick look at one my neighbor has that is similar, trying to figure out hose sizes and ends.

All are 1/2" hoses with swivel ends that I assume are JIC 37 degree flare-fittings. Some take a 7/8" wrench size, and others take a 1" wrench size.

Anybody know what those wrench sizes translate to - in JIC sizes? Anybody know if JIC is the standard used on these hoes? MY IH parts book only gives me IH numbers and no specs.

I know this much.

3/8" JIC uses 9/16" X 18 threads.
1/2" JIC uses 3/4" x 16 threads.
5/8" JIC uses 7/8" X 14 threads.

I'm guessing that the 7/8" wrench size is a 1/2" JIC and the 1" wrench size is a 5/8" JIC. Anybody know if I'm correct?
 
I don't think it's that easy. I've had hoses made and the new ones have needed different sized wrenches. I think it depends on the mfg of the fitting. HTH Jf
 
The 3/8" JIC takes a 11/16" wrench, the 1/2 JIC takes the 7/8" wrench.

Just bring 2 cresent wrenches and you will be fine.
 
We had some 5/8 inch hose ends that took a 15/16 wrench and some took a 1-1/16. This is with the same brand of fittings back when we made and sold fittings. Also for some slow moving steel fittings we would spec them out and they would go out for bid, they would comeback with our trademark, but we did not make them. Sometimes they were different in hex size as well.
 
I think you'd be money ahead to buy your hoses when you get to where the old hoe is located... I know you want to be prepared.... but I've got to agree with some of the other sentiments. I've seen various hex sizes on any given nominal size fitting. It would vary between the brands and even the series of the same brand. I often use Gates replacements.... and they'll be different than the Aeroquip or Parker that I'm removing. Sometimes they're different than the Gates that I'm removing....
That doesn't even beging to account for someone else's buggering over the years where they adapted something else to fit... or welded fittings up to make adapters and so on.
Best to wait until you get there I think...

Rod
 
JIC might be an industrial standard for the
flare end and threads, but different makers
don't always follow it for the HEX that you're
going to wrench on. I've seen different HEX
sizes on the same machine, on different brands.
 
I wish it was a Deere. Deere Company, on their parts website, gives all the specs for their parts. But, this is an International Harvester, and all OEM parts come from Dresser now. All they have is old part #s with no specs.
 
Thanks for the replies. I was hoping maybe somebody else out there had an IH hoe.

I'm well aware of how screwy and odd-ball some hose ends can be. My 1964 Ford backhoe has all British hose ends which are close to impossible to find locally. So, I bought special adapters.

But, I'm not familiar with these IH backhoes. Appears to use JIC swivels, but I'm just guessing. I wish I had it here to take apart. I guess I could go to my neighbors machine, and take one of his hose ends off, drip oil all over his yard, and get his wife ticked off at me.

Buying the new generic premade hoses is not a problem. Just the adapter fittings. I've found that buying premade hoses with male pipe thread ends is often 1/4 the cost of having special hoses made. Just have to figure out what adapter fittings I'd need to make them fit. I know they are 1/2" hoses and also know the lengths. Just the ends are the issue here.

Many tractor companies give full specs for their parts now, on line. But not IH industrial, which comes from Dresser or Komatsu now. All they use is the old IH catalogs with part #s only.
 
I think you should wait until you get where your
backhoe is parked. Then buy your hoses there if any are needed or if you just want spares. If you're uncertain you can pull the hose, but I think most hydraulic hoses will have the size on the covering. I made this No5 5/16 hose as a spare for my garden tractor using reuseable ends.
The swivel nuts need a 5/8" wrench and the hose is from Aeroquip. Hal
m7mus.jpg
 
My 3414 with a 3140 hoe. 5/8 jic and 5/8 o-ring boss is the standard exept the swing, stabilizers and steering which are mostly 3/8jic and orb. I would pick up some SAE10 male orb x sae 10 jic male adapters and sae 10 male 90 degree jic elbows. alot depends on the ser. no. range. I don't have e-mail. you can call me at 906-446-3560. I have measurements and end configurations on a list for mine.
 
Where ever you purchase hose's--make sure that
they are clean inside before installing them.
Dirt and debris from cutting them with a chop
saw or other device can quickly ruin a hydraulic
pump. I always blow hoses out and often shoot
some starting fluid through them, and blow them
out. You'd be supprised at the dirt that comes
out.
A mechanic, at one implement shop where they
NEVER clean new hoses says the boss told him
"Dirty hoses helps sell new pumps"
 
JD, I got a 2606 with case backhoe. Don't go assuming they are 1/2" hoses. My 2606 has a #12 or 3/4" coming off of the main pump. I assumed the hose coming off the secondary pump for the power steering was 1/2" as that is what it looked like till I bought some fittings and found out it was a 5/8" or #10. The flow divider used ORB/O ring boss fittings and the hoses were JIC. A #12 or 3/4 JIC used a 1 1/16" wrench. Don't plan on a crescent wrench getting into some of those tight spots. I ended up buying a wrench.
 
You must log in or register to reply here.

Similar threads

H
Hydraulic line specs
Replies
12
Views
917
Scott 730
Scott 730
Horsez2
Buying a Torque Wrench... First Time!
2
Replies
24
Views
989
jaoneill
J
F
The cost of hydraulic hoses
Replies
8
Views
660
caterpillar guy
C
P
Hydraulic fittings
Replies
15
Views
987
Paint Horse
P
C
MF Power Steering
Replies
1
Views
520
Mduncan60
M
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top