rmg
New member
Just bought a slightly used Danuser PHD with hoses. Everything was laying on ground. Do I need to drain and flush the hydraulic hoses? If yes, how would I go about doing that?
How do I clean out used hydraulic hoses?
- Thread starter rmg
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schmism
Super Member
some recomend you do.
simple to flush them, take the male end off of the QA hose, and cycle the ram to the end that will move pushing the old oil out.
replace end, swap hoses and repeat to cycle the other way.
doing this will also tell you if and how much blowby you have on the internal seals.
simple to flush them, take the male end off of the QA hose, and cycle the ram to the end that will move pushing the old oil out.
replace end, swap hoses and repeat to cycle the other way.
doing this will also tell you if and how much blowby you have on the internal seals.
kennyd
Advertiser
I will "assume" it is a hydraulic PHD since it has hose...So I would hook up only ONE line to your tractor, then remove the QD from the other hose and secure it into a 5 gallon bucket-then operate the remote lever on the tractor very slowly to push all the old fluid out into the bucket. Once it runs clean put the QD back on and check the fluid level in your tractor and add as necessary. I would guess you will need to have 1-2 gallons on hand to completely flush the motor on the PHD.
Just be very careful and go slow! The fluid will be under high pressure!
Just be very careful and go slow! The fluid will be under high pressure!
Willl
Elite Member
Ya think ?kennyd said:
He picks the wrong hose and he'll dead head his pump.
Rmg, quick disconnects on the hoses ?, just clean them up and go with it.
kennyd
Advertiser
He picks the wrong hose and he'll dead head his pump.
The ONE or less second the pump will be deadheaded before switching the lever will do no harm, that is exactly what the relief valve is for. Just in the normal course of operating a FEL the pump is deadheaded quite often for short periods of time.
That is bad advice...He has no idea what kind of fluid is in there or what condition it's in. Supposed it's full of water? He would then pump it right into the tractor!
Wombat125
Gold Member
I have to agree. No unknown fluids in my baby.kennyd said:
Gravdigr
Bronze Member
Wombat125 said:
Did anyone else have something totally different go through their head when they read this sentence?
Anyway I have to second flushing the lines for the above stated reason.
Willl
Elite Member
Does this not hook up to his Power Beyond circuit, where there would be no relief valve ?
Beings he said "slightly used" and assuming there's quick connects on the hoses, chances of contaminates are pretty slim, no ?
kennyd
Advertiser
First, we do not know for sure because the OP has not responded back. BUT a hydraulic PHD would hook up to a remote valve, NOT the PB loop since PHD's do not have valves built into them. If you hooked it into the PB loop it would turn whenever the tractor was running.
Second, most if not all tractors have a relief valve to protect the whole system. They are not just on valves.
But how old is it? It may be 10 years old...and "Everything was laying on ground". That would be plenty of time for water to accumulate in the oil. Is it really worth the risk for the price of one or two gallons of fresh oil?
Now, this may be a regular PTO driven PHD with a cylinder for down pressure, in which case we are just confusing the OP. Hopefully he will respond back and possibly post a picture.
EddieWalker
Epic Contributor
I would take off the hoses and clean them off on the outside real good with just about any decent cleaner. Then I would put a few gallons of diesel fuel into a five gallon bucket and soak the hoses in there. After a few hours, take an air compressor and blow out the hoses. It's messy, but do this a number of times and you'll have clean hoses.
When I rebuilt one of my hydraulic pumps and drive motors on my dozer, this is how I was told to do it.
Eddie
When I rebuilt one of my hydraulic pumps and drive motors on my dozer, this is how I was told to do it.
Eddie
Willl
Elite Member
OK, this part confuses me.(see how easy that happens)kennyd said:
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 ?
Last edited:
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
Advertiser
Willl said:
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
Elite Member
Ya, sorry about that. Hydraulic systems are my least understood subject and I sometimes get overly curious.rmg said:
PB = Power Beyond.
SPYDERLK
Super Star Member
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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.rmg said:
[[[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
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
Advertiser
rmg said:
You do not need to reset the relief valve, it's spring loaded.
gabby
Gold Member
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.
Regarding flushing the old lines, if everything looks in good order I wouldn't worry about it.
SPYDERLK
Super Star Member
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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.gabby said:
larry
gabby
Gold Member
SPYDERLK said:
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.
