It does have fel. And yes power steering ans loader lines would be old and now mixed. I did do filter and the rear filter screen. You think the 1 year old remnant oil will have a meaningful impact on clutch slip ?
2320 Pto shaft is bogging down / slipping !!
- Thread starter mx125
- Start date
oldnslo
Super Member
The solenoid just vents the clutch pack or directs oil to the clutch pack. Is has nothing to do with pressure control.
On most tractors there is some form of pressure reducing or relief valve that controls pressure to the PTO clutch. Typical operation is solenoid off pressure is vented to reservoir. Solenoid energized flow - pressure is directed to the clutch pack. Could also be an orifice in line limiting flow rate to soften clutch engagement. I would be surprised if there is not some test port on that tractor but is possible there is not.
nisaacs
Platinum Member
- Joined
- Mar 9, 2020
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- 725
- Location
- Snowflake, Arizona
- Tractor
- 970 John Deere 4x2, 970 John Deere 4x4, 4320 John Deere, 995 Case/IH
Yes. I would change the oil, clean the screen again and change the filter. The oil has been compromised by the contaminated oil left in the system.
Ok. Interesting. Very helpful. I will do more research and look at oil flow schematic in service manual. I assume there is one. And will change oil and screen again if I can get to a possible solution. Given above I see that perhaps gasket fragment etc got into orifice.
Erik M
Silver Member
I had an internal leak in a hydraulic line in my 1840, it resulted in low pressure on PTO clutch and slipping. Had to split the tractor, replace the line with a hole worn in it and the clutch pack. You can test the pressure externally to verify if this is the likely cause. New line is slightly different so won’t reoccur.
This is a whole new line of learning for me. Very interesting albeit a challenge. I appreciate the knowledge passed along. In service manual there is some ambiguity. There is a photo/guide for “charge pump” pressure test and port that is 100psi. There are fwd/rev high pressure ports at huge pressure 3500psi. The theory of operation talks about hydraulic pump and motor. 21l/min. Not sure how those differ. There is schematic of “hydraulic pump” which is quite small … but has selenoid and relief valve etc. I assume this is what feeds pto clutch? There is also a spec for “pto clutch/brake test port” at 310psi….but no indication where I can find that test port?!
Questions if you aren’t yet tired of all this…..
Is this small pump likely the right place to start? If I remove senenoid might is find debris?
If I were to find this test port, would a debris clog show low pressure (because test port is just before clutch) or if it’s well before before the clutch it may show normal pressure and then be inclusive - ie may be clog somewhere…or may just be failed clutch?
The schematic shows strainer and cartridge filter. Is that simply the big screw on oil filter and cylinder in rear of transmission ? I guess hoping there is a smaller strainer in the pump lines that I am unaware of that could be clogged.
It certainly makes sense that after all the gasket scraping and 2x hydrostatic removal last week I introduced debris. Timing is odd for a failed pto clutch.
Again I appreciate all this.
Questions if you aren’t yet tired of all this…..
Is this small pump likely the right place to start? If I remove senenoid might is find debris?
If I were to find this test port, would a debris clog show low pressure (because test port is just before clutch) or if it’s well before before the clutch it may show normal pressure and then be inclusive - ie may be clog somewhere…or may just be failed clutch?
The schematic shows strainer and cartridge filter. Is that simply the big screw on oil filter and cylinder in rear of transmission ? I guess hoping there is a smaller strainer in the pump lines that I am unaware of that could be clogged.
It certainly makes sense that after all the gasket scraping and 2x hydrostatic removal last week I introduced debris. Timing is odd for a failed pto clutch.
Again I appreciate all this.
oldnslo
Super Member
Does service manual provide a schematic for PTO clutch? Can you post a copy of the schematic? Might help us armchair mechanics assist with diagnosis. Charge pump might be the same pump also used for brakes and PTO. Depending on test port location it could read 310 PSI all the time or only when clutch solenoid is energized. Do the brakes work properly? If yes that would indicate that the 310 PSI is available for brakes so would point towards problem in clutch circuit.
I will try to add as screenshot. I can’t seem to extract a page from the pdf. Let me know if these are readable. Yes brakes work as does steering and FEL and 3 point. And the pto worked for a while. Just started to bog and I shut down After a time it ran fine, on and off. But has done this twice And as noted don’t want to burn clutch if it’s another issue.
Attachments
oldnslo
Super Member
Mx
Item 7 is a priority flow control feeding oil to the PTO circuit. Item 8 is the PTO relief. The charge pump is feeding the PTO circuit. You should see 310 PSI in the PTO circuit when ever the PTO solenoid is energized. De- energized pressure should drop. Now the big question is where can you test this pressure?
Item 7 is a priority flow control feeding oil to the PTO circuit. Item 8 is the PTO relief. The charge pump is feeding the PTO circuit. You should see 310 PSI in the PTO circuit when ever the PTO solenoid is energized. De- energized pressure should drop. Now the big question is where can you test this pressure?
Thank you for this ! And yes ! As noted I saw a spec port in list. I will try to call a dealer.
So IF I was to test ….Would a clog show low pressure ? Or depending on placement of port I might still see 310psi and not know if it’s worn clutch or clog causing issue?
Maybe I should also take your advice on the repair path. IF for now I assume it’s a clog. (don’t want to split transmission without being sure) How do I address it ? Fluid and standard screen change feels like it won’t solve debris in the orifice etc. Can I remove selenoid ( or small pump….or other part) and look for/clean debris ?
So IF I was to test ….Would a clog show low pressure ? Or depending on placement of port I might still see 310psi and not know if it’s worn clutch or clog causing issue?
Maybe I should also take your advice on the repair path. IF for now I assume it’s a clog. (don’t want to split transmission without being sure) How do I address it ? Fluid and standard screen change feels like it won’t solve debris in the orifice etc. Can I remove selenoid ( or small pump….or other part) and look for/clean debris ?
