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Farmall & IHC Tractors Discussion Forum

IH 784 hydraulics question

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Author  [Modern View]

03-09-2016 18:58:37

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I got my 784 ready today and took it for a work out. It runs and pulls great but the hydraulics have an issue. Once it got hot the lift seemed to vibrate when I picked up the harrow. The entire tractor vibrated. The vibration lessened the longer I ran it but it didn't go away. I changed the filter last week and I could've done something wrong there but it appeared fairly simple. I'm going to run it another hour or so to see if it clears. Any suggestions on what might cause this?


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03-11-2016 11:13:09

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 Re: IH 784 hydraulics question in reply to scott2013, 03-09-2016 18:58:37  
5 gallons extra appears to have done the trick. I had read about this but thought its for hydro only.



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03-11-2016 13:34:58

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 Re: IH 784 hydraulics question in reply to scott2013, 03-11-2016 11:13:09  
Scott, the trans/diff has multiple chambers and there is a small transfer pump that is supposed to keep the hydraulic oil level in all chambers so the main hydraulic pump doesn't suck air. So over filling fixes that problem.
BTW nice looking 784.


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03-10-2016 16:54:59

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 Re: IH 784 hydraulics question in reply to scott2013, 03-09-2016 18:58:37  
I. Just changed the filter and fluid. I put in about 10 gallons and I have another 2.5 gallon jug that I'll put tomorrow. I will report back the results.



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03-10-2016 16:36:44

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 Re: IH 784 hydraulics question in reply to scott2013, 03-09-2016 18:58:37  
Hi Scott, is it sucking air from around the filter? Is there plenty of HyTran in the transmission. Check HyTran level with transmission warm and tractor at fast idle at about 1500 RPM. Level should be above hash marks on transmission dipstick. Overfilling by 5 gal is always recommended.

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03-10-2016 04:40:52

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 Re: IH 784 hydraulics question in reply to scott2013, 03-09-2016 18:58:37  
Quoting Removed, click Modern View to see

Chattering check valve? It lifts quick and holds.


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03-09-2016 20:41:01

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 Re: IH 784 hydraulics question in reply to scott2013, 03-09-2016 18:58:37  
Was it lifting it up properly, not lagging or anything as it was being raised. Not sure but it sounds like it didnt have enough pressure built up

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