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Old 04-11-2020, 12:29 PM   #29
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If you can, put a vacuum cleaner on the fill port to pull a vacuum. It'll slow or possibly stop the oil coming out the suction line (the big one to the pump) and probably completely stop flow from the drain plug, if it has one. That gives you time to plug/cap the hoses or add a drain hose to the drain port.



Hi Tom & Jeri
That was a thought I had....looking into the fill spout of the reservoir it looks as if it would suck up the hydro oil into the vacuum hose.... Mine is visible at the top of the fill spout. A friend of mine and myself were looking at that possibility but we thought it might suck up the oil so we gave up on that thought. It is a great idea, but not sure if that will work??I'm thinking that there should be a ball-valve on the bottom of that reservoir for this kind of issue. That is a thought I think i will install a ball-valve on the bottom of that reservoir so I can shut off the oil flow to that hose. that will make it possible for me to change the hose's.

Thanks.
Frank.
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Old 04-11-2020, 01:59 PM   #30
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Hi Tom & Jeri
That was a thought I had....looking into the fill spout of the reservoir it looks as if it would suck up the hydro oil into the vacuum hose.... Mine is visible at the top of the fill spout. A friend of mine and myself were looking at that possibility but we thought it might suck up the oil so we gave up on that thought. It is a great idea, but not sure if that will work??I'm thinking that there should be a ball-valve on the bottom of that reservoir for this kind of issue. That is a thought I think i will install a ball-valve on the bottom of that reservoir so I can shut off the oil flow to that hose. that will make it possible for me to change the hose's.

Thanks.
Frank.
That’s your call, of course, as only you can see what you’re dealing with. But you only have to put enough suction on it to prevent the oil from flowing out the suction line on the bottom until you can get it capped or extended or whatever you need to do. Our mechanics do that routinely on large hydraulic tanks, which on numerous machines in our charge don’t have ball valves on the suction lines (many pumps on a single tank).

Our own designs include ball valves on the suctions, but they have to be locked open and checked daily before starting. Running a pump with the suction closed will trash it pretty quick.

If you put a ball valve on the suction, make sure to use a full-flow valve. Standard ball valves have a smaller passage than the pipe at either end, while full-flow valves have what amounts to a full-sized through hole so you don’t get added restriction. High suction line restriction can damage the pump through cavitation, especially when the fluid is cold.
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Old 04-12-2020, 09:41 PM   #31
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That’s your call, of course, as only you can see what you’re dealing with. But you only have to put enough suction on it to prevent the oil from flowing out the suction line on the bottom until you can get it capped or extended or whatever you need to do. Our mechanics do that routinely on large hydraulic tanks, which on numerous machines in our charge don’t have ball valves on the suction lines (many pumps on a single tank).

Our own designs include ball valves on the suctions, but they have to be locked open and checked daily before starting. Running a pump with the suction closed will trash it pretty quick.

If you put a ball valve on the suction, make sure to use a full-flow valve. Standard ball valves have a smaller passage than the pipe at either end, while full-flow valves have what amounts to a full-sized through hole so you don’t get added restriction. High suction line restriction can damage the pump through cavitation, especially when the fluid is cold.

Hi,
Yes i was thinking that sinaerial too. So I'm looking at using a line clamp so it is impossible for the valve to be closed unless it is closed intentionally. The line clamp has a locking device just for that purpose... I didn't think about the full- flow ball valve. good call. I'll have to check on getting a full-flow. How much vacuum do you apply to the reservoir to keep the hydro from flowing from the hose? I'm thinking I might have hydro oil in my shop vac if I use it to apply vacuum pressure to the hydro reservoir. ??

My other source to apply vacuum is my vacuum pump? But I didn't think it would be strong enough to pull a vacuum?? I think I'll give it a try?



Thank you for your assistance.. I appreciate it.

Frank.
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Old 04-13-2020, 07:54 AM   #32
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If the fluid is too close to the top of the reservoir, risking pulling fluid into the vacuum if air bubbles come in the bottom, then get a length of clear vinyl tubing and siphon some, or for that matter, all of the fluid out. With clear tubing you can see when there's enough in there to start the siphon, without getting a mouthful.

If you're real lucky, the suction line is directly below the fill/vent and you can get the siphon hose into the suction line and pull most of the fluid out of it before doing anything else.

But you don't need to pull such a hard vacuum that it starts bubbling out the top - you just need to pull enough that it doesn't flow out the bottom too fast, or at all depending on the size of the hose. That means you need a way to bleed air into the vacuum suction line to reduce and control the actual negative pressure it's pulling.
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Old 04-13-2020, 08:14 PM   #33
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the tank is vented on mine - neg pressure control would be how tight the vise grips I use to clamp the vent line off are....
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