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Farmall & IHC Tractors Discussion Forum
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826 Hydro wants to go it's own way!

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Centaur Nut

05-19-2008 18:54:06




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Fellows, I"ve inherited an IH 826 Hydro that runs & works sweet, but when you shift from forward to reverse or vice-versa it wants to keep going the way it was going for a short distance before changing directions. I"ve noticed that if I stop in neutral and let the clutch pedal come all the way up it comes up real slow, and when I depress it and shift gears it takes off in the right direction right away. Any advice? The tractor sat parked for several years, but we"ve been running for several months. Thanks, Rick.

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Owen Aaland

05-22-2008 04:17:47




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-19-2008 18:54:06  
This is not a shuttle valve problem. The shuttle valve is used to allow make up oil to enter the high pressure loop of the hydro. It has to switch each time the hydro changes from pulling to holding back. Problems with the shuttle valve will cause free wheeling and no-go situations.

This problem has to be caused by slow response of the pump servo.
The servo is a hydraulic cylinder that controls the angle of the swash plate of the pump. It works by having oil enter the lower pivot end of the cylinder and having a controlled amount of leakage past the piston to the other side of the cylinder and then using a variable orifice to change how much oil leave the cylinder. The surface of the piston is smaller on the inlet side than the outlet side of the cylinder. If the oil going past the piston can not get out of the cylinder, the equal pressure on each side of the piston will cause the ram to retract because that side of the piston has the larger surface and thus exerts more force. If the amount of oil allowed to leave the cylinder is the same as the amount going past the piston, you will get get no movement of the ram because the forces exerted on the piston will the same on each side. To extend the ram requires that more leave the cylinder than is going past the piston. The pressure will drop on the outlet side and more force will be exerted on the inlet side and the ram will extend.

The variable outlet orifice is controlled by mechanical linkage. That is what the control rod does that enters the hydro housing. Problem with the linkage will result is loss of control rather than slow response. Excess leakage through the piston or blockage at the outlet orifice will cause the ram to retract and not extend. Excess leakage at the outlet orifice will cause the ram to extend and not retract. This is not the problem you are having so you can rule out leakage problems in the servo.

Slow response will be caused by lack of charge flow and/or pressure. The charge pressure is used to make up oil in the high pressure loop and to control the servos. It takes very little pressure to add make up oil since it is only add to the suction side of the high pressure loop.
1) Check the oil level. Check with engine running at least two minutes.

2) Check the filter. The one you are concerned about is the one in the screw on canister.
3) Time to use a Flowrator to check flow and pressure in the charge circuit.

4) Problems with the charge pump.

5) Internal leakage in the charge pump circuit,

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RR Mech

05-20-2008 20:43:27




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-19-2008 18:54:06  
On a hydro you should try to run it the way it was designed. You should not even push in the cluch to stop. But if the response is way too slow, the problem is probaly in the servo actuating pressure.



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Allan In NE

05-20-2008 04:01:51




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-19-2008 18:54:06  
Normal operation.

There is a certain amount ('bout 1 second) of "direction change" delay built into the control capsules. This keeps the heavy-handed cowboys from tearin' the thing up.

If you have good de-acceleration in both directions, your tractor sounds plumb okay.

Is the pedal gummed up from grease and dirt? Return spring? Maybe a good cleaning is in order?

Allan



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Chuck's Repair

05-19-2008 19:04:39




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-19-2008 18:54:06  
I believe the shuttle valve determines the direction. it may be sticking. Is the HY-TRAN good?



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Centaur Nut

05-20-2008 04:11:03




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 Re: 826 Hydro wants to go it's own way! in reply to Chuck's Repair, 05-19-2008 19:04:39  
This is more than normal delay. If you stop in forward & shift to reverse without releasing the clutch the tractor will move forward 5 to 6 feet before stopping and going into reverse. Hy-Tran is good, filters have been changed. Can the shuttle valve be cleaned?



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Nebraska Cowman

05-20-2008 06:42:54




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-20-2008 04:11:03  
yeah, a few inches maybe but 5 or 6 feet is unacceptable.



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Allan In NE

05-20-2008 05:14:35




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 Re: 826 Hydro wants to go it's own way! in reply to Centaur Nut, 05-20-2008 04:11:03  
Just so I understand you.

From an absolute "DEAD" stop? It will then move the "wrong" direction a bit before correcting?

Allan



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Centaur Nut

05-21-2008 19:23:29




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 Re: 826 Hydro wants to go it's own way! in reply to Allan In NE, 05-20-2008 05:14:35  
If I am going forward and depress the clutch and come to a full stop, place the shift lever in reverse and release the clutch the tractor will move forward 5 to 6 feet before stopping and going int reverse, and the same thing happens when shifting from reverse to forward. If I shift to neutral and release the clutch when changing directions the pedal comes up real slow, and when I place the shift lever in gear and release the clutch it immediately goes in the selected direction. I have 2 other 826 Hydros (My F-i-l LOVED them for hay baling!) and they don't pause anything like this one.

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