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Farmall & IHC Tractors Discussion Forum
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Hot H hydraulics

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Doug

04-25-2004 21:39:39




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Just got an H running after 30 years and took it down the road about 1 mile to the guy who gave it to me to see for the first time. When I got there we were looking it over and noticed the two hydraulic lines and the pump where very hot. Like too hot. I filled the reservoir with tractor fluid from Napa and cleaned everything out the best I could when I restored the tractor. I removed the cylinder the guy was using and am just recycling the oil through the pump and then back to the reservoir. Also, the other day when I fired it up it spewed about 1/8 quart of hydraulic oil out the vented cap on the hydraulic fill cap. Is there air in the reservoir or pump??? Why would that make the pump and hydraulic lines so hot. I'm afraid it will blow the lines running that hot. This hydraulic system was added back in the 1950's but was bought from the dealer. Is the hydraulic oil too thin??? Suppose there could be a little water in the system but can't be much. Thanks for the help.

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Bob M

04-26-2004 08:24:29




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 Re: Hot H hydraulics in reply to Doug, 04-25-2004 21:39:39  
Doug - Sounds like the hydraulic control valve has stuck in either the lift or drop position. This loads (dead heads) the pump so flow is bypassed continuously thru the relief valve. It will heat up the entire hydraulic system VERY quickly.

Check to see if the remote valve is stuck – it should center by spring action from both extremes of travel.

If the tractor has a remote 4 way (“Christmas tree”) valve with hoses running to a coupler at the rear of the tractor, it is indeed stuck and you don’t need hydraulics, you can connect the two hoses together to take the load off the pump. Or if it has a belly pump you can simply remove the pump drive shaft (a 5 minute job) to disable the pump.

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Joe Evans

04-26-2004 06:53:07




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 Re: Hot H hydraulics in reply to Doug, 04-25-2004 21:39:39  
I concur with SGT K. If the pump is under continual load, the tractor would crank over hard when starting, and the engine would idle at a lower RPM than normal. Are any of these conditions present?



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SGT K

04-26-2004 06:22:05




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 Re: Hot H hydraulics in reply to Doug, 04-25-2004 21:39:39  
Doug,
I'm not the most experienced guy to answer your question, but it sure sounds to me like your pump is under a constant load.
Paul



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Doug

04-26-2004 08:54:06




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 Re: Re: Hot H hydraulics in reply to SGT K, 04-26-2004 06:22:05  
This hydraulic pump mounts on the cam drive gear and then the mag is driven from the hydraulic pump (was added later from the dealer). I only have the two hoses from the pump back to the reservoir. No controls or other remote lines are attached. I hear the motor puill down and the pump changes pitch when I engage the hydraulic lever so was assuming that the pump was out of gear. I know the guy I got the tractor from has the piece that the mag used to mount to. Am considering removing the hydraulic system all together. Have a 3 point system to mount but don't want to fight the hydraulic pump too much.

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Bob M

04-26-2004 09:48:36




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 Re: Re: Re: Hot H hydraulics in reply to Doug, 04-26-2004 08:54:06  
Doug – Sounds like the hydraulic pump is still partially loaded even when the valve is in neutral. Otherwise there is no way for the pump/system to get hot while running (it should be only slightly warm).

Don't be too hasty about removing the live pump! It’s a pretty handy thing to have – especially with a 3 point.

Suggest working the valve handle around to try to find the true neutral position. By listening for changes in idle speed/pump sound you should hear it load/unload as you move the handle. Could also be there’s something wrong inside the valve itself so the tank return port is partially blocked even when the valve is in neutral.

I presume your reservoir/valve is the standard Farmall “Liftall” unit?

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SGT K

04-26-2004 09:26:11




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 Re: Re: Re: Hot H hydraulics in reply to Doug, 04-26-2004 08:54:06  
I wish I was smart enough to help you more, I still think your pump is under a load, but I'm not sure what to tell you to do. Don't just take the pump off, hang in there. Some one here will give you the right advice.



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Doug

04-26-2004 21:11:12




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 Re: Re: Re: Re: Hot H hydraulics in reply to SGT K, 04-26-2004 09:26:11  
Thanks guys. I'll keep at it. I do want that 3 point to work so better stick with it. Been at it on this old H since November 14 and am getting a little tired. Just have a couple more minor problems to solve and she should be ready for another 30 years. Thanks again.



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