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Massey Harris & Massey Ferguson Tractors Discussion Forum
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65 Multipower pump pressure

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Warner Elliott

11-03-2020 03:38:54




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Rebuilding 65 Multipower transmission. Piggyback pump for clutch pack is relieving at 300psi when dead headed. Is this enough or should I try and increase the pressure by adjusting or shimming the relief spring? Pump seems to be in good condition when inspected. Thanks for any help.




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Dieseltech

11-03-2020 03:44:43




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 Re: 65 Multipower pump pressure in reply to Warner Elliott, 11-03-2020 03:38:54  
If I recall the shift valve spool relief valve is set for 175-200 PSI.



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Warner Elliott

11-03-2020 03:56:07




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 Re: 65 Multipower pump pressure in reply to Dieseltech, 11-03-2020 03:44:43  
Thanks, so 300 psi at pump should be OK?



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joe ferguson

11-03-2020 10:10:33




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 Re: 65 Multipower pump pressure in reply to Warner Elliott, 11-03-2020 03:56:07  
On my 1965 MF-135



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Warner Elliott

11-03-2020 13:58:26




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 Re: 65 Multipower pump pressure in reply to joe ferguson, 11-03-2020 10:10:33  
Thanks, I will assume from your pictures that my pump pressure is acceptable.



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joe ferguson

11-04-2020 08:21:28




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 Re: 65 Multipower pump pressure in reply to Warner Elliott, 11-03-2020 13:58:26  
You measured pressure dead headed... when Multi-Power or independant PTO clutch pack
is applied it may loose some pressure due to slight leaks in clutch packs.
When the oil is hot and thinner the pressure will be slightly lower.
I think that if the pressure is not lower than 200 PSI in all circounstaces it will be OK.

HTH

Joe



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joe ferguson

11-04-2020 08:27:58




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 Re: 65 Multipower pump pressure in reply to joe ferguson, 11-04-2020 08:21:28  
Sorry there was Multi-Power in the MF-65 but if my memory is good... not yet independant PTO

Joe



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Warner Elliott

11-04-2020 16:12:30




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 Re: 65 Multipower pump pressure in reply to joe ferguson, 11-04-2020 08:27:58  
Joe,thanks again. My clutch pack is shot so only can build around 100 psi when pump is connected to shift valve. Looks like retaining ring came loose in clutch pack housing letting the clutch components come apart. I just tested the pump to make sure it also does not need replacement as well. I disconnected the hose from the pump and connected gauge directly to pump outlet. It builds to 300 psi idling and you can see the relief open and pump starts dumping oil. At 2000 rpm the pressure is about 310 and noticeably more volume dumping. You are correct as my parts book does not show any option for an independent pto on a 65.

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