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Farmall & IHC Tractors Discussion Forum
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Hydraulic Cylinders

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PAULIH300

01-05-2005 15:01:37




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On my 300U I raised the bucket about 5' off the ground and left it raised (engine off)(needed to take a look under the bucket itself),I then grabbed the bucket and tried forcing it downward(to see how solid it was).It moved down about 4" but sprung back up.It feels like a spring,and not solid hydraulics.Is there a problem with a valve (Hydra Touch lever?pressure valve?).I figured it would be rock solid.

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Hermit

01-05-2005 18:43:54




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:01:37  
Some single acting actuators will have a set screw in the shoulder that is used to let air out of the upper end. Makes it a whole lot easier if it's there.



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big fred

01-05-2005 15:24:24




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:01:37  
Paul, if that's the same loader I have, there's only one line going to those cylinders and it's at the bottom when installed. You won'd get the air out by cycling the system. You'll need to get that hose inlet to be the highest point in the cylinder and then cycle it a few times. Best way to do that is unhook (one side at a time will work) the top of the cylinder and lay the end something such that the top is lower than the bottom, then cycle the system. You'll need to push the cylinder by hand (or rig a spring or bungy setup on it) since it is single acting. Not a difficult task, but a pain in the rear nonetheless.

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Hugh MacKay

01-05-2005 15:05:47




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:01:37  
Paul: Sounds like you have some air in the system. Raise the loader all the way about dozen times, do the same with bucket tip. That should expell the air.



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PAULIH300

01-05-2005 15:08:43




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 Re: Hydraulic Cylinders in reply to Hugh MacKay, 01-05-2005 15:05:47  
Should the fill cap be off at the same time?



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Hugh MacKay

01-05-2005 15:44:20




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:08:43  
Paul: As Andy pointed out and I should have worded it differently, " Put every cylinder through the complete lenght of it's stroke about a dozen times." Ocasionally air can be a bit stubborn.

One problem common to that era of IH tractors was resovoir too small. If you find the loader getting jerky at or near full height, it is from lack of hydraulic oil. That lack of hydraulic oil also introduces air to the system each time that jerkiness happens. Most IH tractors of that era needed additional resovoir to operate a loader with hydraulic bucket. We had a Farmall 300 at home and added a 3 gallon resovoir. That more than doubles oil supply and makes system run much cooler and smoother. All you need is a tank that can run graviety into tractor hydraulic system, via pipe or hose. Your fill cap and breather then must be moved to top of added resovoir. I would only look at doing this if air seems to be a real niusance in the system.

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PAULIH300

01-05-2005 15:49:31




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 Re: Hydraulic Cylinders in reply to Hugh MacKay, 01-05-2005 15:44:20  
I have noticed where it has a problem at near full extension,however,I would have little use of the bucket that high in the air...so it will probably never see that height again.Yes...it did struggle to get to that near-vertical height.
The dump cylinder works great though (course its doing very little real work,unlike the lift cylinders).



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Andy Martin

01-05-2005 15:17:22




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:08:43  
The fill cap should be vented.

If it is not, and you have it off, you could blow some hydraulic fluid out while you are cycling the system.

I'm sure Hugh means raise it all the way up and all the way back down several times.



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Brian in Toronto, Ontario

01-05-2005 15:16:32




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:08:43  
Shouldn"t matter if the cap is on or off, the system should be able to breath somewhere to avoid pressure build up in the resovoir.



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PAULIH300

01-05-2005 15:19:37




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 Re: Hydraulic Cylinders in reply to Brian in Toronto, Ontario, 01-05-2005 15:16:32  
There is a breather under the seat.

I have cycled the lift a number of times since the last hose replacement,but maybe I need to cycle it more....



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Andy Martin

01-05-2005 15:21:25




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 Re: Hydraulic Cylinders in reply to PAULIH300, 01-05-2005 15:19:37  
It really is air. You might have to crack a connection if you are not getting the air back to the reservoir.



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PAULIH300

01-05-2005 15:28:41




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 Re: Hydraulic Cylinders in reply to Andy Martin, 01-05-2005 15:21:25  
There are quick disconnects going to the dump cylinder but the lift cylinders are hosed directly.So,its going to be a lot easier to bleed the one than the other two.



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