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Farmall & IHC Tractors Discussion Forum
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snow plow hydraulics question.

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Brian in NY

01-31-2007 06:35:03




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I have a two way cylinder to lift the blade on my snowplow on the H.

Of course the H hydraulics are one way.

Is there an easy, cheap way to add a return line or even a vent line to allow this two way cylinder to lower my plow blade faster? Right now only one line hooked up and naturally the fluid is flowing back into resevoir through that line. It literally takes 30-45 seconds for the plow to lower when raised 6-8 inches.
Gets cold sitting on the tractor waiting for it to drop!

Can I just get a one way cylinder?
If so...anybody want to trade for this newer two way cylinder?

The plow is an ancient Meyer plow, and believe me it is plenty heavy enough to pull down this cylinder if it were operating correctly.

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Bob, seND

01-31-2007 13:22:05




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
Brian,
A little more expensive, but a very nice way to go is to mount a spool valve on your tractor, run the lift all line to it, and back to lift-all reservoir. Leave your hydraulic pump running continuously through the spool valve. Continue to use your two way cylinder, and you now will have two-way hydraulics to the blade. It should lift the front of your tractor right off the ground.
Bob

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Nat 2

01-31-2007 11:05:21




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
It could be that there is a restrictor in the pressure line that keeps the tractor hydraulics from launching the blade into orbit when it's lifted. This restrictor has the effect of making the blade drop VERY slowly because there's no pressure to force the fluid through the tiny hole.

A one-way cylinder is just a two-way cylinder with one of the hoses removed. If you traded, you'd be trading like-for-like. Back in the day, there were such things as one-way cylinders that were not designed to handle pressure on one side, but that's not the case anymore.

Just make sure the "down" hose is not capped off. If it is, remove the cap and drill a hole in it to make a vent, or buy a vent plug to replace it with.

Look at all the elbows in the pressure line. Take them apart and see if they're completely open. If one has a tiny hole, that's what is causing your problem.

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the tractor vet

01-31-2007 10:06:35




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
If the cylinder that you are using now is in good shap then all ya have to do is remove one hose and i am guessen that it is half inch pipe that it takes for a fitting all ya need is a half inch pipe plug and drill and 3/16 hole in it and put a cotter pin thur the drilled hole and bend it so it does not come out and you have a breather now the cylinder is a one way . Now if the packing in the piston is getting tired then she may leak .

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Janicholson

01-31-2007 08:30:38




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
Bob M may be on to something. Do put a vent in the end of the cylinder that is not connected. It needs to be pretty open, 3/8" hole or so to move air. The control rod has four positions on Our SH and H. Pull way out = lift
let in to stop on rod at bracket = Hold
Push in a little farther to a detent = lower slowly
Push in firmly to the bottom of travel Drop like a rock. I hope this is an answer of use. JimN

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Brian in NY

01-31-2007 09:28:02




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 Re: snow plow hydraulics question. in reply to Janicholson, 01-31-2007 08:30:38  
The one thing I do have right is the control rod settings...I do use the second detent which should be the fast drop.

I agree that my HY-tran is thick stuff...but the tractor is kept inside, and even when the fluid is nice and warm (summer), this cylinder is 90% as slow.

Now I am going to have to post some photos so you guys can tell me where to plumb in this vent.
The ram of my cylinder faces up, and the body is below, this runs vertical. There does not seem to be anything to tap into on the upward facing (where ram exits) part of the body. There is another fitting on the other side of the bottom of the body. How could I tap into that and not have fluid dumping on the ground? I assume I could rig up a short length of hose and route it upward with a vent cap on it...maybe?

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Janicholson

01-31-2007 14:58:38




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 09:28:02  
I agree with Bob M, This cylinder is probably set up to have both supply/return fittings on the "bottom" end. Attach a hose (even garden hose) to a fitting on the unused port, and run it up high enough to stay out of the primary dirt and/or snow. Loop it so that it faces downward, and put a lawnmower air filter on the end of it. (just the cartridge. Go for it. JimN



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Bob M

01-31-2007 09:33:44




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 09:28:02  
Brian - A photo of the cylinder would be helpful!

From your description it sounds like it has both the rod and cap end ports located on the bottom (cap) end.



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RustyFarmall

01-31-2007 07:56:52




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
What are you using for hydraulic oil? 30wt motor oil is pretty stiff in cold weather, and will result in slow hydraulic functions. You might consider changing to 20wt. You can even go to 10wt, but probably don't want to leave the 10wt in for warmer weather.



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Bob M

01-31-2007 07:28:19




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
Brian – The set-up you have should drop like a stone with the blade connected!

Could be the control valve (located inside the belly pump reservoir) is messed and not opening fully when the lever is in the “drop” position.

Also is there for a restrictor valve (combination check and adjustable needle valve) in the blade cylinder cap end port? If so it may need to be adjusted (opened) to let the oil out faster.

Good idea to put an elbow facing down and breather filter in the upper cylinder port to keep snow, etc from getting into the cylinder. Also suggest oiling the cylinder rod occasionally is it is otherwise “running dry” in your one-way configuration….

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Hayfarmer

01-31-2007 07:01:35




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
normally when you use a 2 way cylinder as a 1 way you would put a breather plug in the other end. You can buy those or make one. That allows the air to leave. If there is leakage in the piston it may also blow oil out. With weight on it the oil should flow back quite rapidly.



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gene bender

01-31-2007 06:57:30




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 Re: snow plow hydraulics question. in reply to Brian in NY, 01-31-2007 06:35:03  
just put a vent plug in the unused port. I do the same with my rear blade on the B as i just use the port that lifts the blade. I drilled a hole in the plastic plug then turned the hole down so as not to get moisture in the cycl.



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