How do I clean out used hydraulic hoses?

[Willl]

most if not all tractors have a relief valve to protect the whole system. They are not just on valves.

OK, this part confuses me.(see how easy that happens)

I believe I was told just the opposite about my JD 790. That it had no relief between pump and Power Beyond circuit and to never run with 'loop' disconnected or bad things would happen to the earths rotation.
Consulting my tech manual also shows no relief untill rock shaft valve and the PB circuit is before it.(if I'm reading it correctly)

Is the 790 the odd ball ?

 

[rmg]

Wow! Y'all know alot more about this than I do. What's a PB? I don't really know what all I have. I do know that I have a Kubota M9540 with two ports/valves on back that I plug the two hoses from my batwing mower into. Just today I realized that apparently there are two more ports/valves to the right of these. What are they for? I'm guessing the Danuser PHD that started this post apparently has been used only a handful of times by the look of it. Today I called the dealer I bought the unit from and he said the hoses should be fine, just clean the ends and plug them in. Well I'm a little leary of what could be in the hoses. Might be water, an incompatible hydraulic fluid, or whatever. After all, the unit and hoses were just laying in the grass when I first saw them.

 

[kennyd]

OK, this part confuses me.(see how easy that happens)

I believe I was told just the opposite about my JD 790. That it had no relief between pump and Power Beyond circuit and to never run with 'loop' disconnected or bad things would happen to the earths rotation.
Consulting my tech manual also shows no relief untill rock shaft valve and the PB circuit is before it.(if I'm reading it correctly)

Is the 790 the odd ball ?

Well, maybe I am confused on the location of the relief valve...but that discussion is getting this post far off topic for the OP isn't it?

 

[Willl]

Wow! Y'all know alot more about this than I do.

Ya, sorry about that. Hydraulic systems are my least understood subject and I sometimes get overly curious.

PB = Power Beyond.

 

[SPYDERLK]

Wow! Y'all know alot more about this than I do. What's a PB? I don't really know what all I have. I do know that I have a Kubota M9540 with two ports/valves on back that I plug the two hoses from my batwing mower into. Just today I realized that apparently there are two more ports/valves to the right of these. What are they for? I'm guessing the Danuser PHD that started this post apparently has been used only a handful of times by the look of it. Today I called the dealer I bought the unit from and he said the hoses should be fine, just clean the ends and plug them in. [[[Well I'm a little leary of what could be in the hoses.]]] Might be water, an incompatible hydraulic fluid, or whatever. After all, the unit and hoses were just laying in the grass when I first saw them.

That other pair of remotes is for plugging your choice of hyd implement into. Remote setups from the mfgr are always protected by a relief valve.
[[[It worries me to worry so much.]]] Fluid incompatibilities are very low level if they exist at all. Themain worry is water. Press in the connector ball or poppet to get a little fluid out. If the fluid is clear or near so, OK -- milky, flush.
A real issue is that remotes stop flow between the output ports when the valve is centered- -no relief valve here. Hydraulic motors are abused by this because the motor must stop instantly if you quickly center the valve. Since the PHD motor is driving a small mass rather than a big flywheel you should be ok even in the long term. Just idle down before you turn the motor off and try to ease the valve lever to center rather than flicking it. Should you get heavy into motors you will need to use a control valve with a motoring spool, or use a cushion relief valve in the motor lines.
larry

 

[rmg]

So there may come a time when I will need all 4 ports? Where is this relief valve? If it pops, do I need to reset it? The hoses have leaked a little fluid in the back of my truck (where they have been since I got them last week) and the fluid appears to be hydraulic fluid only, no milk. Glad you brought up idling down and easing the valve lever. Contacted Danuser and hope to get an owers manual soon so I can properly and safely operate PHD. Guy I bought PHD from reminds me of others in my past who've said, "Just plug it in, it'll be ok."

 

[kennyd]

So there may come a time when I will need all 4 ports? Where is this relief valve? If it pops, do I need to reset it? The hoses have leaked a little fluid in the back of my truck (where they have been since I got them last week) and the fluid appears to be hydraulic fluid only, no milk. Glad you brought up idling down and easing the valve lever. Contacted Danuser and hope to get an owers manual soon so I can properly and safely operate PHD. Guy I bought PHD from reminds me of others in my past who've said, "Just plug it in, it'll be ok."

You do not need to reset the relief valve, it's spring loaded.

 

[gabby]

Chances are, the hydraulic motor has a check valve on the outlet to protect against back pressure if the hydraulic lines are hooked up backwards. The hydraulic motor on my water wagon pump has this.

Regarding flushing the old lines, if everything looks in good order I wouldn't worry about it.

 

[SPYDERLK]

Chances are, the hydraulic motor has a check valve on the outlet to protect against back pressure if the hydraulic lines are hooked up backwards. The hydraulic motor on my water wagon pump has this.

Regarding flushing the old lines, if everything looks in good order I wouldn't worry about it.

Virtually all hyd motors are reversable and just turn backward if the fluid flow is reversed. Dont see why they would need a check valve. Back pressure is no more harmful than front pressure.
larry

 

[gabby]

Virtually all hyd motors are reversable and just turn backward if the fluid flow is reversed. Dont see why they would need a check valve. Back pressure is no more harmful than front pressure.
larry

The hyd. motor on my centrifugal water pump can only pump water in one direction so I guess that's why it has a check valve.

If the motor on the auger in question is reversible that's good. Won't really matter how the hoses are hooked up, and you can always reverse the auger if it hangs a root and the 3ph can't raise it up out of the hole.