backhoe and FEL hose reeplacement Question...

I have what seems to be a 19-105 loader and a 1168/F9 backhoe on the tractor. Pretty much every hose needs replaced some sooner than others.

I have replaced hoses on the skid steer and they don't require bleeding the air out, they just cycle the air out of the lines pretty quick on its own. This FEL and backhoe Im not sure about.

When I replace a couple hoses, do I have to do anything special to bleed out the air in the new lines and in the cyls that get air in them on the F9 and 19-105? Or do I just put the new ones on and cycle the cylinders in and out until the air is gone?

Some of the longer hoses are going to make a lot of trapped air.... I don't want to screw it up. Thanks!
 
No need to worry about bleeding any air. Cycling the cylinders repeatedly will work all of the air out of the system.
 
I got another one...

Some of these lines on the backhoe are linked with iron pipe.... looks like standard black iron water pipe. Is that how they were made, or did somebody put those in there instead of hard hydro lines?

Are they safe? Or should I replace those lengths with new rubber line?
 
These are the iron pipes on the boom, I don't know if these are the way its made or something somebody rigged on here in place of actual hoses or hydro hard lines. The one pic of the base of the cyl that lifts the boom up and down has those 2 elbows, which are iron pipe elbows. I'm thnking they should be actual hydraulic line 90s not pipe maybe...


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schedule 40 black pipe (3/4") has a rated working pressure of 1080 pounds. 1/2" is a bit higher. Burst pressure is considerably higher.

Dunno what your machine had on it originally, the loader on my 4500 has steel lines considerably less robust than black pipe, but the materials and engineering make all the difference.
 

Knowing the operating pressure of the backhoe and the FEL would be a good thing to know. I imagine that depends on the pump they are using. This tractor has a pump on the PTO and a pump on the front of the engine.

Maybe that data is on the pumps... I'll have to take a close look.
 
(quoted from post at 21:26:02 12/10/20)
Knowing the operating pressure of the backhoe and the FEL would be a good thing to know. I imagine that depends on the pump they are using. This tractor has a pump on the PTO and a pump on the front of the engine.

Maybe that data is on the pumps... I'll have to take a close look.

The control valves for both the loader and backhoe should have their own pressure relief valves built in. The maximum pressure of the pump should be in the 2800 to 3000 psi range, but the relief valve on the backhoe should be set at around 2400 psi and the one on the loader should be set around 2200 to 2300 psi. So those iron pipes should never see anything above 2400 psi.
 
So those iron pipes should never see anything above 2400 psi.

Which goes back to the question.... are they safe? The parts book doesn't specify what they are just "1/2 NPT tubes". The drawing of the elbows seems to be just what is on it.
 
I put the new hoses on this backhoe today. It went pretty smooth, no problems or leaks.

Those iron pipe joints.... the elbows and connectors on the ends were literally only finger tight, and they were not leaking. Go figure.

The system must not be under that much pressure I guess.

those old hoses were as hard and stiff as iron pipe.... good thing I replaced em.
 

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