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John Deere Tractors Discussion Forum
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Hydraulic pumps

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svcummins

10-10-2019 21:52:22




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Looking for options again or still ? Seems most of the aftermarket ones are around 970$ found a site with rebuilt ones for 650$ plus 300$ core seems like a decent price if they will credit you for the core ? Oem Is a lot of money probably canít go that route

The local hold em n screw em Is a little higher like always on the exact same part I donít plan on buying from them

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svcummins

10-12-2019 12:38:39




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
So with my trusty infrared thermometer and jumper hose I set out to do some am diagnostics I got the oil up to operating temp which took about an hour and I did get a little chatter at about 30 minutes in then it stopped and never anything else the remainder of the test



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Al Baker(pumpman)

10-12-2019 05:34:09




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
You might have two different things going on. I did a 4020 this spring that knocked really bad. When I pulled it off I noticed the spline was really worn. Nothing else looked bad in the pump. I installed a new shaft and coupler with seal kit and loud knock was gone. Maybe you have a problem with a remote, and a problem with the drive?? Easy to pop the drive coupling and see if the rubber bushings are good and the spline is tight. Al

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svcummins

10-12-2019 10:39:08




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 Re: Hydraulic pumps in reply to Al Baker(pumpman), 10-12-2019 05:34:09  
Al Iíll check that



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fdt860

10-12-2019 05:08:19




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
I would suggest to swap scvs if you have spares.

My 4020 did have a huge power loss from the pump. It was the detent valve roller pin. Repair cost 50 cents and diagnostic was obvious.



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svcummins

10-12-2019 10:41:05




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 Re: Hydraulic pumps in reply to fdt860, 10-12-2019 05:08:19  
I could swap scvs pretty easily . Going to drill today with the old power lift lz1010 so no hydraulics needed other than steering so weíll see what happens .



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Tx Jim

10-12-2019 03:27:29




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
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Many frt CC hyd pumps have been replaced only to determine that pump replaced wasn't the problem.
Does engine load while operating steering or 3 pt? If no engine loading with PS/3 pt operation something is wrong with scv poppet valve adjustments such as return valve clearances set ""too wide"" not opening quick enough to send oil to return path.

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svcummins

10-12-2019 10:38:35




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 Re: Hydraulic pumps in reply to Tx Jim, 10-12-2019 03:27:29  
Thanks Jim Iíll do a lot more testing before I throw a thousand dollar pump at it . Iím not a parts changer Thatís whatís nice about this page is you guys have given me a lot of things to check together with the manual weíll get er figured out. When I started this journey to become a mechanic i swore Iíd never be the guy who throws parts at something to try and fix it .

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fdt860

10-11-2019 22:05:41




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
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Cap the pump pressure line before going further. If pump is robbing power even with a cap, you are likely to have a few broken poppet valves seats and springs in the pump.

I found a place in Turkey that sold the individual parts of those pumps for cheap. You can get rebuilt kit without shaft for around 300 on fleabay.

Otherwise tractor is leaking big time.

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svcummins

10-11-2019 23:10:50




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 Re: Hydraulic pumps in reply to fdt860, 10-11-2019 22:05:41  
Itís only taking power when I use the remotes



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buickanddeere

10-11-2019 11:54:06




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
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Could be just the pump drive coupling .



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svcummins

10-11-2019 21:46:22




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 Re: Hydraulic pumps in reply to buickanddeere, 10-11-2019 11:54:06  
I wish that would be it but that pump is taking some serious power to turn



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Hay maker2

10-11-2019 10:39:27




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
I know they are not cheap.

Have you checked your supply pressure and volume?

I also know that there is nothing funner than to drop the front end on a 3020 or a 4020, but for the price of a new pump I would swap your pumps around form the 4020 to the 3020. As much of a PITA that this is, its much better than OWNING a new pump and that's not the problem.
I have also rebuilt the pumps too, you don't save much. I think your better buying a new one if that is truly the issue.

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svcummins

10-11-2019 10:56:55




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 Re: Hydraulic pumps in reply to Hay maker2, 10-11-2019 10:39:27  
By the time you buy the parts to rebuild one itís cheaper to get one with a warranty the last time I looked .



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Al Baker(pumpman)

10-11-2019 10:19:17




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
Ever thought of pulling your own down and repairing it?? I have done many over the years and found more times than not it wasn't a bad deal. Just mark all eight plugs and springs with pistons and keep them in order. Mark the housing and reassemble the way it came apart. Al



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svcummins

10-11-2019 21:45:27




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 Re: Hydraulic pumps in reply to Al Baker(pumpman), 10-11-2019 10:19:17  
Iím thinking about that actually



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Hay maker2

10-11-2019 09:55:09




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
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I assume that this is on your 3020, doesn't that have a farmhand loader on it?

the loader work ok, but the SCV does not?



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svcummins

10-11-2019 10:01:30




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 Re: Hydraulic pumps in reply to Hay maker2, 10-11-2019 09:55:09  
Yes 3020 powershift but no loader . The loader was on the 4020 right now the loader is in pieces in the garage waiting to be reassembled and reinstalled



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Hay maker2

10-11-2019 05:03:40




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 Re: Hydraulic pumps in reply to svcummins, 10-10-2019 21:52:22  
What exactly is wrong with your pump?



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svcummins

10-11-2019 09:35:03




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 Re: Hydraulic pumps in reply to Hay maker2, 10-11-2019 05:03:40  
It is knocking and it lugs the tractor down a lot when you cycle the scv lever



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