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Case Tractors Discussion Forum
:

1370 jumps backward when inching pedal pressed

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RGMartin

05-31-2020 15:40:18




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One of my long term projects is an early 1370. I have fixed a few problems, but am thinking I have a powershift problem. I know to really diagnose it I need to put gages on it...

Anyway, when the inching pedal is pushed in, it will lurch backward a bit, even if you are hard on the brakes. It has always felt weak in the field compared to my 1175, even when making lots black of smoke and boost. I am thinking I have something dragging in the powershift. Am I off base?
I need an engine for another project, and don't want to dive into another powershift repair.

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1370rod

06-01-2020 15:16:52




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
As Mel mentioned C2 and C4 are required to make reverse. By depressing clutch we want C2 to drop off to stop the tractor. C2 can remaining engaged because there is hydraulic pressure or mechanical drag problem in the clutch pack. If it was a mechanical drag it would want to keep backing up all the time the pedal is depressed and you would be grinding gears trying to shift the 4 speed. You did not mention if either of those are occurring. Hydraulic problem could be C2 retard set to tight, simply back off retard screw a turn or two to check. Could be C2 pilot spool sticking or even inching pedal out of adjustment. The easiest place to start after checking retard is put a pressure gauge in C2 test port and watch if pressure drops off with the pedal depressed. If it does, it is mechanical problem, if not check the hydraulic possibilities. Let us know what you find. If the tractor seems weak compared to the 1175, as others have mentioned the first thing I would check is inlet air system. There can be other causes of course but in my trade area a air problem was by far the most common for excessive smoke and low power. You must have a problem for sure, the 13 should be able to kick butt on the 1175. Rod.

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MEL

06-01-2020 05:23:36




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
RG, the issue you mentioned with the backward motion when depressing the clutch is not unheard of, the powershift uses a combination of C-2 and C-4 to make a reverse in the powershift. When you push the pedal C-4 engages and if C-2 is still partially engaged the reverse combination is briefly activated. When the pedal is depressed do you have trouble selecting the 4 speed without grinding, If so you have a clutch drag issue with C-2 such as clutch plate warpage but if the surge is very brief I kinda doubt it. Hoping 1370 Rod jumps in on this post as he is probably more experienced in the larger tractors than I, I would like to talk to him about the possibility of C-2 retard being set a bit to tight but I would think you would notice that as a surge on upshift from 1st range to 2nd range powershift. If C-2 retard is keeping the clutch from disengaging quickly enough it would contribute to the issue you are having, I may just call him when I am sure he is around as they are an hour behind us here in Pa.

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Case Nutty 1660

06-01-2020 06:32:44




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 Re: 1370 jumps backward when inching pedal pressed in reply to MEL, 06-01-2020 05:23:36  
mEl,, as you said if the retard set too tight will indeed do this,, there is also a screen in the RPS valve that if blocked will cause the same issue,, if it will stop pulling after say 15 to 20 seconds with pedal depressed I have seen the screen be the issue as it will not let the oil bleed off fast enough ,, I have also seen deeper PS damage cause the dragging hard to be sure without seeing it do it in person for me,, I can normally tell where the issues are if the machine is at hand,, Rod is busy on the farm at the moment but may check in and see the post

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dwag

06-01-2020 15:35:51




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 Re: 1370 jumps backward when inching pedal pressed in reply to Case Nutty 1660, 06-01-2020 06:32:44  
Screen in RPS valve?



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Case Nutty 1660

06-01-2020 20:52:24




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 Re: 1370 jumps backward when inching pedal pressed in reply to dwag, 06-01-2020 15:35:51  
yup



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dwag

06-02-2020 07:00:19




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 Re: 1370 jumps backward when inching pedal pressed in reply to Case Nutty 1660, 06-01-2020 20:52:24  
Where, that's a new one on me, got a picture/part#?



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RGMartin

05-31-2020 18:34:38




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
Quoting Removed, click Modern View to see

Yes, new filters too... it makes lots of boost, wouldn't boost with a lack of air.



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BarryfromIA

05-31-2020 18:25:18




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
Have you checked the air intake pipe for nests.



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RGMartin

05-31-2020 18:22:44




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
Quoting Removed, click Modern View to see

Thanks but the theory was to save the cost of a rebuild(have a couple much loved 451BDTs here) and recover some of the investment from the 1370.



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097Clint

05-31-2020 16:54:46




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 Re: 1370 jumps backward when inching pedal pressed in reply to RGMartin, 05-31-2020 15:40:18  
Hello RG,good evening,not sure where your located,but I have a 504 needs a rebuild,out of a 2090.if your interested

Clint



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