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John Deere Tractors Discussion Forum
:

Well its not

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svcummins

09-15-2020 19:51:49




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The rockshaft leaking oil . Capped the supply line and no change . Guess the brake valve and steering valve next




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svcummins

09-19-2020 20:23:44




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
Shimmed the valve still no change . Have to pull the rockshaft housing and find the check valve



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Tx Jim

09-20-2020 06:10:28




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 Re: Well its not in reply to svcummins, 09-19-2020 20:23:44  

If that 4020 was under my supervision I would perform some more diagnostics before removing RS housing to inspect check valve.



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svcummins

09-20-2020 09:48:06




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 Re: Well its not in reply to Tx Jim, 09-20-2020 06:10:28  
What else should i do ? Im all ears all ive got is time ? Need to make it work its not my hobby tractor and i need to know what it needs to fix it . I worry about not enough oil going to lubricate the transmission or something else before i hook it to the plow for the next two months



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Tx Jim

09-19-2020 04:49:51




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
I think oil exiting hose attached to rockshaft return oil port originates from trans oil pump which shouldn't affect overall hyd system performance



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svcummins

09-19-2020 12:23:50




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 Re: Well its not in reply to Tx Jim, 09-19-2020 04:49:51  
Ok



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Tx Jim

09-19-2020 03:33:36




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
SV

If I was diagnosing your tractor & the weather temp's were above freezing & hyd filter had relatively low hrs of use I would shim the hyd filter relief valve very snug for a experiment. I would also re-check output in GPM's of trans pump.
IIRC you did state when you disconnected your new FEL 3 spool valve return line then start engine with all 3 spools in neutral & NO OIL exited open hose?????

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svcummins

09-19-2020 04:07:18




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 Re: Well its not in reply to Tx Jim, 09-19-2020 03:33:36  
No oil coming through the new valve not even a drop . One thing I forgot was there is some oil coming up the hose from that valve which is where my return oil is plumbed in . I will shim the valve and see what hspoene . Wonít be until later today sometime



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Scott 730

09-18-2020 07:31:13




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
Quoting Removed, click Modern View to see
The plug shown on JD parts for an early 4020 looks different that yours.



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svcummins

09-16-2020 17:58:55




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
Got the valve off . Im guessing there should be spring pressure against this valve



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svcummins

09-18-2020 07:37:41




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 Re: Well its not in reply to svcummins, 09-16-2020 17:58:55  
Its the same plug its had since 1967 . I really donít think this is the problem



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svcummins

09-17-2020 19:15:25




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 Re: Well its not in reply to svcummins, 09-16-2020 17:58:55  
I guess ill keep looking this turned out to be no luck either.

Looks like the spring has bounced off the plug a few million times over the last 53 years



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M-MAN

09-18-2020 02:54:57




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 Re: Well its not in reply to svcummins, 09-17-2020 19:15:25  
Did you check the parts file to see if there is supposed to be a plug on the other end of the spring?



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svcummins

09-19-2020 03:11:01




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 Re: Well its not in reply to M-MAN, 09-18-2020 02:54:57  
I canít see anything missing from my valve according to the parts breakdown. It does look like in the diagram the plug they show has a t!t on it for the soring to sit on and keep it centered. It would be interesting to know if that spring should hold pressure again that plug ?



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svcummins

09-16-2020 20:32:29




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 Re: Well its not in reply to svcummins, 09-16-2020 17:58:55  
Can someone find the length of the spring from the part number



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Tx Jim

09-17-2020 04:53:20




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 Re: Well its not in reply to svcummins, 09-16-2020 20:32:29  
JD has decided recently too much parts information was available on the internet so they either deleted parts spec's or relocated the info to where I can't access parts spec's. I looked in SM2038 for 3000 series & if spec's are listed for that spring I overlooked the spec's. Filter relief valve is designed to only open in "cold weather or clogged hyd filter" . Is valve free to move in housing?

SM does mention that a check valve in trans case could be at fault accessed by removing rockshaft

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svcummins

09-17-2020 09:45:57




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 Re: Well its not in reply to Tx Jim, 09-17-2020 04:53:20  
The valve is free in the housing. I may order a spring since its cheap just to see but my guess is thats not the issue either



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M-MAN

09-17-2020 10:41:12




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 Re: Well its not in reply to svcummins, 09-17-2020 09:45:57  
JD Parts wasn't any help other than to show that spring being used everywhere. that's why it's so cheap.

Not sure if I pulled up the correct diagram for yours so you need to double check it. I saw a plug on the end that you don't have in the pic. That would explain the spring being short???



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svcummins

09-17-2020 09:43:07




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 Re: Well its not in reply to Tx Jim, 09-17-2020 04:53:20  
Ya there is a check valve as well . The spring doesnít apear to be broke and it doesnít look to be compressed or distorted. Book really doesnít say



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svcummins

09-16-2020 20:24:01




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 Re: Well its not in reply to svcummins, 09-16-2020 17:58:55  
Any ideas



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Tx Jim

09-16-2020 03:45:20




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
I agree with wore out that a faulty hyd oil filter relief valve could be your tractors hyd problem.



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wore out

09-15-2020 21:11:20




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 Re: Well its not in reply to svcummins, 09-15-2020 19:51:49  
I don't recall if you've capped the suppliy to the SCV's?



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svcummins

09-15-2020 22:15:11




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 Re: Well its not in reply to wore out, 09-15-2020 21:11:20  
Yessir theyíre capped and are atill capped. Seemed ok after I capped off the rockshaft for a couple cycles then right bsck to not enough oil



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wore out

09-16-2020 03:15:13




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 Re: Well its not in reply to svcummins, 09-15-2020 22:15:11  
So you have to figure out where the oil is going that's supposed to be returned to the front pump.

This is a pre-side console tractor, IIRC?

Do you have the official SM2039 manual?

Have you checked the hydraulic oil filter relief valve... read the second paragraph below. Note that if something is wrong at the relief valve some oil would be dumped to the transmission case rather than going forward to the hydraulic pump.


Note how the function return oil and oil from the transmission pump combine at the filter, then are routed to the front pump, with the excess flow then flowing upward, filling the reservoir, then returning to the transmission.

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svcummins

09-16-2020 16:15:08




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 Re: Well its not in reply to wore out, 09-16-2020 03:15:13  
So where is the relief valve actually



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