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5020 has pto that quit


 
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gqjoe
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Joined: 09 Jul 2009
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PostPosted: Sat Jul 20, 2013 9:31 am    Post subject: 5020 has pto that quit Reply to specific post Reply with quote

Hi there, I have a 1967 John Deere 5020 that just had all its hyd oil flushed, rebuilt main hyd pump and cooler replaced with one that has a check valve up by the radiator. The other day i used it for harrowing and all of a sudden the tractor chattered as it had trouble lifting and dropping the harrows. The steering is beginning to act like there is air in the system too. Also now when i try the pto, it does nothing. Out of gear the shaft spins a little bit but while in gear, it turns really slow and theres no power it seems to it. Is it the gear pump? Can one fail so fast? I thought they gradually wear over time, not right away. Or do i need to try to adjust the pto engagement itself? Im at a standstill on this one and would appreciate any help.
 
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Tx Jim
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Location: Coyote Flats,Tx

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PostPosted: Sat Jul 20, 2013 10:26 am    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote


I'll suggest to check pto hyd valve operating pressure. I'd think 150-160#s would be sufficient pressure
 
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coonie minnie
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PostPosted: Sat Jul 20, 2013 6:06 pm    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote

I doubt the PTO problem is related to engagement, you questioned... given the other symptoms of wierd steering and poor performance with the hydraulic SCVs, I'd say you have a hydraulic issue somewhere. If I'm not mistaken, both PTO engagement and braking are done via the hydraulic system on these.

You mentioned the "gear pump"- I'm assuming you mean the transfer pump in the transmission that supplies oil to the main pump. When I had one of those fail, there was no hydraulics whatsoever.

I think you need to measure output from the main pump first, and then work back from there.

Checking the sump screen and filters would also be prudent before going too far.
 
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gqjoe
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PostPosted: Tue Jul 23, 2013 6:09 pm    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote

Thank you for the reply, I will start from the main pump and work backwards. I just hope that I find a forgotten rag plugging the sump screen when I take it out and all my problems will be solved!!
 
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gqjoe
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PostPosted: Tue Jul 23, 2013 6:14 pm    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote

Thanks for your reply, and to check the pressure at the pto
Hyd valve I place a gauge in the two plugs that need an Allen
wrench down beside the valve and filter area? I'm pretty sure I
know where you mean to check. Do you think that those
valves fail easily or are easy to adjust?

Thanks
Joe
 
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Tx Jim
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PostPosted: Wed Jul 24, 2013 3:40 am    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote


I'd suggest to check trans pump flow. It should be in the 5 gpm range.
 
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gqjoe
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PostPosted: Wed Jul 31, 2013 6:10 pm    Post subject: Re: 5020 has pto that quit Reply to specific post Reply with quote

Thank you for your help guys. So far, I thought I"d check on the sump screen and after I drained the oil I found that my sump screen was very clogged up, almost looks like a rag was left inside when the rear diff lid was off. I changed the tractor from a 3 point hitch to one without earlier this spring. I guess I have some flushing and draining and cleaning in my future. I"ll run it now for a couple hours then drain and clean again. And then I"m going to check my pto and pump outputs to see where I"m running at.

Would anyone happen to know if there is demand for a 3point hitch set up? I have this extra one now and I"d sure like to find it a new home!!

Thanks again
 
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