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Hydraulics question

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Bob Perry
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Hydraulics question

Postby Bob Perry » Sun Mar 02, 2014 1:41 pm

I have a 12 volt hydraulic power pack, from an old dump trailer. I'm using it to extend a small cylinder. I believe it's a .625 rod, maybe 1" bore, (don't have access to it right now) but the problem I have is the cylinder extends way too fast for what I'm doing. I was thinking of putting one of these in-line with the "out" from the pump but not sure if it's the right thing to do:

http://www.northerntool.com/shop/tools/product_200336348_200336348

I like the idea of it restricting the flow in only one direction, because the return (by gravity) is about the right speed as it is now.
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Rick Prentice
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Re: Hydraulics question

Postby Rick Prentice » Sun Mar 02, 2014 2:04 pm

Bob, can you give more info on what you're lifting? One thing first off is if you install the flow valve in the pressure line to the cylinder, one of two things might happen, or both. If you only have one line going to the cylinder and you restrict it with a flow valve, it may squeal the relief valve in the power pack pump to achieve the speed you want. Also remember when you restrict the flow to raise the cylinder, it will also restrict the flow when reversed, which may take forever to retract.

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When I told my dad I've been misplacing things and doing stupid stuff----His reply---"It only gets better"

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Bob Perry
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Posts: 1866
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Zip Code: 02748
Tractors Owned: :

1949 Farmall Cub / FH

1951 Farmall Cub / IH mower

1964 International Cub Lo-Boy / Woods 59 mower

1967 International Cub / FH

1946 Farmall H

1949 Farmall H

a doodle bug

More than a dozen Cub Cadets running plus a few in the bone-yard

.
Location: Dartmouth, Massachusetts

Re: Hydraulics question

Postby Bob Perry » Sun Mar 02, 2014 2:30 pm

Thanks, Rick.

Well it's a small dump body, about 4' long by 3' wide.

That's what I was thinking too, if I restrict the flow, the relief valve would squeal.

As far as the return goes, the description of this particular product says "flow control and full shutoff in one flow direction, unrestricted flow in opposite direction."

Should I just try to find a smaller pump? Maybe give up on the "power pack" idea and run a small pump directly off the engine and keep the rpm's as low as possible.
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SONNY
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Re: Hydraulics question

Postby SONNY » Sun Mar 02, 2014 9:43 pm

Dont waste your time with the wimpy juice suckin battery killin electric stuff! go direct with a REAL hyd. pump!!!!---youll be glad you did! thanks; sonny

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Bob Perry
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1967 International Cub / FH

1946 Farmall H

1949 Farmall H

a doodle bug

More than a dozen Cub Cadets running plus a few in the bone-yard

.
Location: Dartmouth, Massachusetts

Re: Hydraulics question

Postby Bob Perry » Mon Mar 03, 2014 6:16 am

SONNY wrote:Dont waste your time with the wimpy juice suckin battery killin electric stuff! go direct with a REAL hyd. pump!!!!---youll be glad you did! thanks; sonny

Mostly because I try to use what I've got before I spend money! But I might buy a small pump because I can turn it slower.
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SONNY
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Re: Hydraulics question

Postby SONNY » Mon Mar 03, 2014 9:57 pm

I truly understand! LOL! BUT sometimes ya just cant cut corners!---A real small pump is not super costly!---the BIG guys are EXTREEEEMLY costly!
Also forgot to mention that I dont think you can restrict the flow on the electric units without damaging them! ---might want to check that out for sure before you put re-stricter on them! thanks; sonny

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Bob Perry
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Tractors Owned: :

1949 Farmall Cub / FH

1951 Farmall Cub / IH mower

1964 International Cub Lo-Boy / Woods 59 mower

1967 International Cub / FH

1946 Farmall H

1949 Farmall H

a doodle bug

More than a dozen Cub Cadets running plus a few in the bone-yard

.
Location: Dartmouth, Massachusetts

Re: Hydraulics question

Postby Bob Perry » Fri Mar 14, 2014 2:29 pm

I bought the item in the first post from Northern and it works great. Makes the speed adjustable, can adjust from slow to fast. And it has no effect on the gravity return, works just one-way. Perfect !
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Re: Hydraulics question

Postby SONNY » Sat Mar 15, 2014 8:53 pm

Way ta go Bob!!! glad it works for you!!!! thanks; sonny

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Re: Hydraulics question

Postby Jack fowler » Sun Mar 16, 2014 9:00 am

Bob Perry stated: I bought the item in the first post from Northern and it works great....


Thanks for the reply Bob, that really helps.

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Re: Hydraulics question

Postby Smokeycub » Sun Mar 16, 2014 9:26 pm

Gotta love it Bob! Glad that worked for you and a tidbit to store in the memory banks. The restrictors are usually for the other way, to slow things when going down on a single action cylinder, which is what most electric pumps are hooked up to. FWIW I think those pumps have flow a control mechanism built into them, it could be for the return rate, not sure right now, I know Meyers Plow pumps do. My son and I used an electric pump for a dump bed on his pickup truck and plumbed it into a control valve (spool) which operated a double action cylinder, it worked great. The only thing was we have to run the pump and operate the control valve at the same time. We fab'ed up the lift mechanism as well out of 2" heavy wall square tubing. It was a fun project and we used stuff I had collected over the years so it was a low budget project as well.
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Bob Perry
Cub Pro
Cub Pro
Posts: 1866
Joined: Sun Feb 22, 2009 3:30 pm
Zip Code: 02748
Tractors Owned: :

1949 Farmall Cub / FH

1951 Farmall Cub / IH mower

1964 International Cub Lo-Boy / Woods 59 mower

1967 International Cub / FH

1946 Farmall H

1949 Farmall H

a doodle bug

More than a dozen Cub Cadets running plus a few in the bone-yard

.
Location: Dartmouth, Massachusetts

Re: Hydraulics question

Postby Bob Perry » Fri Mar 21, 2014 9:29 pm

Thanks for all the help. I'll be finishing this project soon and will post a youtube video. Hydraulics work perfect with that item from Northern.
REMEMBER: Keep it correct or you may face the

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