Go BottomJohn Deere 3520 Hydraulic Problems Moves Slow
 | wrankin
Join Date: Jan 2016 Posts: 4 Pauls Valley,OK 
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2016-01-28 194394
I have a 3520 with about 330 hrs had to the dealership twice change hydraulic oil and filter both times and put new pump on last time and still doing same thing and getting worse it take more rpm to make it go they cant find the problem getting pretty costly I only have about 3 acres and it about 3 years old have to run it at least 1800 rpm to make it go.
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
 | Chief
Join Date: Jul 2003 Posts: 4299 Southwest MiddleTennessee 
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2016-01-28 194395
Been a long time since I have traded posts with you. Besides your tractor problem, hope you are doing well. I noticed you have moved since.
You stated that BOTH filters were replaced. Actually there are 3 filters. The 2 external spin-on filters and the third filter is the suction screen inside the transmission that prefilters the suction filter oil. Was the suction screen removed and inspected/cleaned? ....
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
| wrankin
Join Date: Jan 2016 Posts: 4 Pauls Valley,OK
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2016-01-28 194396
I will have to check with my dealership and see. Thanks ....
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
 | DennisCTB
Join Date: Nov 1998 Posts: 2709 NorthWest NJ
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2016-01-29 194399
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Hi Chief good to see you on TP. Were you thinking of Mark with handle Drankin? I think he is still in Nevada and does not have that model Deere.
Dennis ....
Link: Drankin profile
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
| Chief
Join Date: Jul 2003 Posts: 4299 Southwest MiddleTennessee
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2016-01-29 194402
Hi Dennis,
About 10 minutes after I posted my reply I got to thinking and thought it was drankin and realized my mistake. Thanks for the note though. My memory is going to the dogs.....and even dogs have better memory than me. :) ....
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2016-01-30 194403
The fluid & pump are just 2 of 4 key parts of a hydrostatic system.
Just as important are the drive motor(s) and pressure control system. It's usually the pressure that's the issues on a machine with that few hours on it.
If you have some debris sticking the pressure relief valve open, a broken spring, a faulty quick-disconnect (QD) fitting, or even a bad remote valve it will affect the system possibly almost shut it down.
I don't know if your unit has an open-centre system or not, but if it did something as simple as a QD fitting not quite seated would cause exactly the symptoms you're describing.
I would have hoped the dealer would have checked pretty carefully before getting into a really spendy option like replacing a pump.
A little more testing and experimenting should narrow down the possible culprits.
Best of luck. ....
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Add PhotoJohn Deere 3520 Hydraulic Problems Moves Slow
| wrankin
Join Date: Jan 2016 Posts: 4 Pauls Valley,OK
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2016-01-31 194418
Thank you for your help. ....
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