Hydraulic hose fittings on a CAT 426 backhoe?

Billy Mac · Jun 2, 2020

Hello, I am new to working on backhoes and to this forum. My friend bought a CAT 426 backhoe and I am helping him replace some very worn hydraulic lines. I am looking for good price hoses for him. The hose that is very bad is the left stabilizer hose. It is a 1/2 inch hose. I found a hose on the Surplus Center website and they have either JIC 8F Swivel or a JIC 10F Swivel fitting. The hoses seem very reasonably in price. I figure the 8 and 10 are the size in 1/16 inch increments. The backhoe is 4 hours away from us up at his mountain farmhouse. Does anyone know what size and type fittings are on the CAT 426 Backhoe?

Thanks.

kshansen · Jun 2, 2020

Okay now that you are in the right place I guess the first thing I would ask is what is the S/N of this 426? S/N's are very important when trying to find information on most machines and very helpful for Cat equipment.

A general answer would be that there is a very good chance that those lines are NOT JIC Swivels. Very likely ORFS fittings, also referred to a flat face seal fittings. Where a JIC fitting has a tapered end on it or 37º and seals by a metal to metal connection. Where a ORFS fitting the mating surfaces are flat and they have a groove in the fitting for an oring to seal the joint.

JIC fitting to the left and the ORFS on the right. In both images the hose would be connected to the end facing to the left!

Billy Mac · Jun 2, 2020

Here are the machine id tags:

I think you should be able to see them. The machine is old.

Billy Mac · Jun 2, 2020

Here are some pictures of the hose. I don't think you can tell unless they are decoupled, but maybe you know.

heymccall · Jun 2, 2020

Every hose on that machine can be identified in a parts diagram, linked to a part number, which can then be broken down into length, style fittings, and pressure rating.
Using your serial number, I picked a segment at random.

heymccall · Jun 2, 2020

You need #10 & #11 for each stabilizer.

Billy Mac · Jun 2, 2020

I think I getting the hang of this. I was looking around the CAT Parts website and came up with:
https://parts.cat.com/en/foleyinc/9R-1183
This is the same thing you came up with. Many thanks for pointing me in the right direction. You guys are good!

Delmer · Jun 2, 2020

Kshansens pictures are obviously TOP and BOTTOM, the thread style on the right on both fittings is O ring boss.

Discounthydraulichose .com has a thread id download that will show almost all possible thread styles and the thread count and diameter. So all you need is a caliper and thread gauge to tell what nearly any fitting is. If the Cat sites can't get you the info, or for any other fitting.

heymccall · Jun 2, 2020

9R-1183 is the short one with a 90° fitting on one end. The Orings are a 6V-8397, which indicates that the fittings are -6 ORFS.

Billy Mac · Jun 2, 2020

Thanks Delmer, good stuff!

Billy Mac · Jun 2, 2020

Thanks, now I need to figure out how to give you guys likes!

edgephoto · Jun 2, 2020

@Billy Mac I have the same machine just a little older. 7BC1596 for mine so not too far apart.

All the fittings are ORFS (O-ring face seal). I have replaced those hoses on my machine along with every other hose so far except steering hoses and swing cylinder hoses. Have not got to those, yet.

I found a local hose shop that will make them up for a fraction of the cost of Caterpillar. So far every hose has a matching size fitting. In other worlds a -8 (1/2") hose takes a -8 fitting. All the hoses have female ends. There are a few -10 hoses on the machine too.

If you need any help let me know. I am no expert but have been working on my machine for a few months now trying to get her in top shape. I have the HIS program which comes in handy. SOme of the hoses on my machine were way too long or two piece and the detail for each part number hose helped me get things squared away.

heymccall · Jun 3, 2020

My dealer lists that 9R1183 at $70.

edgephoto · Jun 3, 2020

heymccall said:
My dealer lists that 9R1183 at $70.

My dealer lists that hose for $72.73. My local hose would charge me no more than $25. I have 7 hoses made a couple weeks ago. 4 of them are fairly long as they are for the hoe. $130 for all of them. If I had bought them from my Cat dealer they would have been over $1000. I did the math.

Cat hose is supposedly a bit better than the aftermarket hose but I figure for a homeowner these hoses will be fine. Lots of equipment guys use this shop.

You can buy reusable fittings and hose. Then you can make them yourself if you are so inclined. Just use a metal cutoff wheel to cut the hose.

heymccall · Jun 3, 2020

I only listed the CAT price to inform the original poster. Myself, I'd grab the 471TC-6, 1JS43-6-6, and 1J943-6-6 off my shelf and use my Parkrimp 2 to assemble them.

Welder Dave · Jun 3, 2020

edgephoto said:
My dealer lists that hose for $72.73. My local hose would charge me no more than $25. I have 7 hoses made a couple weeks ago. 4 of them are fairly long as they are for the hoe. $130 for all of them. If I had bought them from my Cat dealer they would have been over $1000. I did the math.

Cat hose is supposedly a bit better than the aftermarket hose but I figure for a homeowner these hoses will be fine. Lots of equipment guys use this shop.

You can buy reusable fittings and hose. Then you can make them yourself if you are so inclined. Just use a metal cutoff wheel to cut the hose.

They make special blades for cutting hydraulic hose and the hose needs to be thoroughly cleaned out before installing.

Billy Mac · Jun 3, 2020

heymccall said:
My dealer lists that 9R1183 at $70.

edgephoto said:
My dealer lists that hose for $72.73. My local hose would charge me no more than $25. I have 7 hoses made a couple weeks ago. 4 of them are fairly long as they are for the hoe. $130 for all of them. If I had bought them from my Cat dealer they would have been over $1000. I did the math.

Cat hose is supposedly a bit better than the aftermarket hose but I figure for a homeowner these hoses will be fine. Lots of equipment guys use this shop.

You can buy reusable fittings and hose. Then you can make them yourself if you are so inclined. Just use a metal cutoff wheel to cut the hose.

Good to know. I will see what I can find, if prices are high maybe I will ask for your shop's info. Thanks!

Billy Mac · Jun 3, 2020

heymccall said:
I only listed the CAT price to inform the original poster. Myself, I'd grab the 471TC-6, 1JS43-6-6, and 1J943-6-6 off my shelf and use my Parkrimp 2 to assemble them.

I just looked at used Parkrimp machines, very pricey I must say.

mitch504 · Jun 3, 2020

The special blades for cutting hose are only worth it if you are going to cut a lot of hose, abrasive cut off wheels work fine.

You do need to get the rubber dust out, no matter what you use. Well, not neccessarily, when I was young I saw many a hose cut in the woods with a sharp axe, and good skills. No dust made that way.

heymccall · Jun 3, 2020

We're a private contractor. I wouldn't begin to know how to bill an outside sale

Back in the heyday, we started with all Komatsu, and, naturally, no one but the Komatsu dealer stocked Komatsu only hose ends, hence the machine being purchased.

Hydraulic hose fittings on a CAT 426 backhoe?

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