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Farmall & IHC Tractors Discussion Forum
:

URGENT HELP PLEASE, IH 756

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Huss

05-21-2007 23:21:34




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G'day

Hope all is well.

I am hoping that some one might have a copy of the flow diagram for the raising and lowering of the lift hydraulics. I am having a concern with the position lever. My work shop manual only has a complete flow chart not specific to the rear end.

The flow diagram could also be one for an IH 2756 or IH 766 as they are compatible.

It all started with the 3pl. While I was working away the linkage started to raise and lower automatically I new I had a leak. The linkage would try to pick the implement up but would drop again after half way. This would repeat over and over, I had the local mechanics haul it back as I had to go back to work.

It was obvious the oil was dumping and some of the orings needed replacing. The guys did that at the work shop & replaced any other orings that didn’t look right…..
All leaks stoped.

When it was reassembled the position lever would only allow you to raise the linkage when you put the lever in the low position and then pull it back all the way to the raised position. Once you attained the position you could stop it. How ever if you had implements on you could not raise the 3pl any further because you would have to lower it first. I mean you couldn’t lower the position lever because of the implements. I hope im making sense.

It’s hard to get a manual with a flow diagram that showed the lower & raise of the lift hydraulics.

The mechanic pulled out the cylinder assembly for the draft control, valve assembly for the drop control and the valve assembly for the draft control.

Any help would be appreciated

Huss

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Allan In NE

05-22-2007 03:44:18




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 Re: URGENT HELP PLEASE, IH 756 in reply to Huss, 05-21-2007 23:21:34  
Huss,

Is there any way you can put a heavy load or a gauge on one of the remotes to check your pressure?

If the remotes don't work either, then you've probably got a cover o-ring, pump or regulator problem to start with because low pressure will make that lift repeatedly "cycle" due to simple starvation.

Also, I’d really suspect this if the tractor just plain won’t lift a load.

I've never owned a 756, but I'm guessing that you should probably see somewhere around 1800 lbs at high engine idle.

Allan

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Huss

05-22-2007 05:16:53




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 Reply to Allan. A role model for many. in reply to Allan In NE, 05-22-2007 03:44:18  
Hi Allen,

As always you take the time to help other, You are a role model for many.

Thank you for your reply. I havnt checked the pressure as I had replaced the 12gpm pump with a new 17gpm pump and assumed it was fine. I guess not will look at that tomorrw. Will also do the same with the regulator.

It is actually lifting fine. The problem is that if i want to raise the position lever any more it is not just a matter of pulling it up a inch or two. I have to lower the raise position lever all the way back down and start to pull it up again. This is the problem.

Thank you again Huss

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Nat 2

05-22-2007 06:04:16




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 Re: Reply to Allan. A role model for many. in reply to Huss, 05-22-2007 05:16:53  
I think you're probably only going to find what you're looking for at a CaseIH dealership, back in the shop. Heck, they probably have a service manual that walks you through troubleshooting the problem. The hydraulic system is pretty much the same right from the 1964 '06 series right up through the 1975 '66 series.

The challenge is getting access to these manuals. If you've got a good rapport with the mechanics, you can probably borrow the manual from them.

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Allan In NE

05-22-2007 05:54:49




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 Re: Reply to Allan. A role model for many. in reply to Huss, 05-22-2007 05:16:53  
I dunno,

IF YOU HAVE GOOD PRESSURE and from the way you describe it, the problem has got to be in that drop check. Either that, or that sensing linkage is loose or way out of time with itself.

Hope you get 'er figured out.

Allan



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