Case/Davis trencher backhoe

[Eugen]

Good eye . Yes they sure do look like that . Just need to source the right type and size hose .
@Eugen I have done these before . i can walk you through the dos and don't if you like .

Dave, do you think the fellow in Hillsdale might have the right hose?

[Eugen]

There's hose that's spec'd for using them. Yes if you can reuse them you should save some bucks, bulk hose isn't too bad compared to made up lines.
I don't know how they are with that across the border shipping and fees but I used Discount Hydraulic hose.com last year when I was doing the selector valve, very reasonable. I like the local Carquest, they usually have what I need and make it while I wait but Discount was a third the price and spot on. Four days from out east.

Tried to figure out what type of hose is spec'd for these last night. Can't say I was successful

The old hose has written on it "Aeroquip - 1509 - size 6 - HP - 4Q79 - 1" and the fitting is stamped "1107" and under it "6". One thing is clear to me is that it's dash 6, that is ID 3/8. Did quite a few searches for the Aeroquip and the other things that are written on the hose, came empty.

Going at it logically, I'm thinking it has to be hose that is double steel mesh reinforced and to hold at least to 4000 psi, and the ID has to be 3/8. The thing that's a bit of a mystery is what OD it should be.

The number "1509" on the hose does seem like a type of hose from Aeroquip, as they do have for instance 1503. But 1509 doesn't come up much, so maybe it's an old type of hose. Found some specs for it with OD of 0.84". Went and measured the old hose, indeed it is 0.84 outer diameter. Yay!

Maybe a coincidence, but the 100R2 hose which is double steel mesh reinforced and operating max pressure of more than 4000 psi also has OD 0.84. At this point I'm thinking that's the type of hose to use, but it would be nice to be 100% sure. I would not buy and use hose with such uncertainty. This one needs more digging

[Eugen]

Well, it turns out that not all 100R2AT hose is outer diameter 0.84, the one at discounthydraulic.com is 0.75 OD.

Screenshot 2023-04-03 at 11.03.44.png (4 KiB) Viewed 4752 times

[Timj]

There's hose that's spec'd for using them. Yes if you can reuse them you should save some bucks, bulk hose isn't too bad compared to made up lines.
I don't know how they are with that across the border shipping and fees but I used Discount Hydraulic hose.com last year when I was doing the selector valve, very reasonable. I like the local Carquest, they usually have what I need and make it while I wait but Discount was a third the price and spot on. Four days from out east.

Tried to figure out what type of hose is spec'd for these last night. Can't say I was successful

The old hose has written on it "Aeroquip - 1509 - size 6 - HP - 4Q79 - 1" and the fitting is stamped "1107" and under it "6". One thing is clear to me is that it's dash 6, that is ID 3/8. Did quite a few searches for the Aeroquip and the other things that are written on the hose, came empty.

Going at it logically, I'm thinking it has to be hose that is double steel mesh reinforced and to hold at least to 4000 psi, and the ID has to be 3/8. The thing that's a bit of a mystery is what OD it should be.

The number "1509" on the hose does seem like a type of hose from Aeroquip, as they do have for instance 1503. But 1509 doesn't come up much, so maybe it's an old type of hose. Found some specs for it with OD of 0.84". Went and measured the old hose, indeed it is 0.84 outer diameter. Yay!

Maybe a coincidence, but the 100R2 hose which is double steel mesh reinforced and operating max pressure of more than 4000 psi also has OD 0.84. At this point I'm thinking that's the type of hose to use, but it would be nice to be 100% sure. I would not buy and use hose with such uncertainty. This one needs more digging

I'll do some looking later too. I know when looking at different hose I had ran into "approved for field repairable ends" I'm thinking it just needs the thick rubber outer jacket for the coupler to thread onto, not the thinner reinforced outer that is common today.

[Eugen]

I'll do some looking later too. I know when looking at different hose I had ran into "approved for field repairable ends" I'm thinking it just needs the thick rubber outer jacket for the coupler to thread onto, not the thinner reinforced outer that is common today.

To make it a little more complicated, the Eaton 1509 seems to be a military spec hose and an equivalent hose is the Eaton 2766, also military spec and the outer diameter is 0.84-0.87. The popular double steel braid hose now is the SAE 100R2AT which has outer diameter 0.75 If these fittings were really made for the 0.84 diameter hose I would be worried using them with 0.75 OD.


For the record, here are pics of the markings on the fittings, which I could find nothing about though.

There are two types, identical in size but different markings.
1.

2.

[thebuildist]

Uh...

What's the OD of the hose that's currently attached in there?

Bob

[Eugen]

Uh...

What's the OD of the hose that's currently attached in there?

Bob

exactly 0.84, just like the spec says for the eaton 1509-6 hose which is marked on it. I'm tempted to get a length of 100R2AT and use it on the loader for testing.

[thebuildist]

That seems reasonable to me. I'm not speaking from experience, but it seems like any two wire hydraulic hose with the 0.840D is going to work just fine.

And if I recall correctly 100 R2AT is rated for 8,000 PSI. You won't be running above 3,000, so you'll be way way within its limits.

Bob

[thebuildist]

Do you have a thread pitch gauge handy where you could tell me the The thread pitches on both the smaller visible thread and the larger internal thread inside that collar?

Bob

[Eugen]

Sorry guys, I probably confused you all. Let me try to explain a little clearer.

The reusable fittings came installed with Eaton/Aeroequip 1509 hose, which seems to be in their military/marine catalog, and has 3/8 ID and 0.84 OD. Obviously this hose is not easy to find. Apart from the larger outer diameter it seems to have similar specs to the most widely used hydraulic hose, the SAE 100R2AT. Which is two wire braids and around 4000 psi operating pressure, for the 3/8 ID.

The problem is that the SAE 100R2AT hose has an outer diameter of 0.75.

Can't find any details about the fittings. If the fittings were correctly used with the right hose for them, I'm worried that a hose with smaller diameter might not provide proper coupling with the fittings. What's the chance that the fittings were spec'd for 100R2AT and they used thicker hose because that's what they had on hand?