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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Re: MF 165 Hydraulic problems

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DavidP, South Wales

08-16-2013 14:21:46

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Hello Mike, how are you?
Taking your posting in stages;
The control spring plunger should be tightened until the spring is stiff to turn by hand. When checking this insert a punch or thin screwdriver into the pin hole so that it does not tighten.
When adjusting the control spring nut the DRAFT lever must be in the fully lowered position. Adjust the nut until endfloat just disappears. Any further and it will reappear.
When you go into the PRESSURE CONTROL part of the quadrant and cannot lower the lift arms, do you have any implement attached or just the empty arms. Pressure Control will vary the pressure from about 500psi to blow-off pressure. The system cannot work at zero pressure when in PC low. This pressure is around 1/6th of the available pressure. It takes far less than that to lift the empty linkage. 500psi was enough to lift my concrete counterbalance!
When the divertor valve is switched to the loader you have effectively sealed off the 3-point lift circuit. There may be some leakage past your DV but the bulk will escape past the seals/rings in the lift cylinder. This is quite normal unless it is falling in less than 3 to 5 minutes.
Partly drain the oil and remoce the RH side cover. Reaching inside and upwards you will find the PC adjuster barrel. It has quite sharp 'teeth' around the outside at the lower end. Do not turn it but check that it moves up and down when you operate the PC lever. The action is to increase the load on a spring and valve inside the housing.(When in the POSITION CONTROL quadrant the spring remains fully compressed at its adjustment. A pressure gauge would be a good investment as you will need one if you carry out the adjustment sequence. You will require a gauge to read to at least 3500psi.
Hope this helps. Let us know.
DavidP, South Wales

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08-19-2013 08:33:50

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 Re: MF 165 Hydraulic problems in reply to DavidP, South Wales, 08-16-2013 14:21:46  

Thanks for the pictures. They're better than the ones I had. That's what I meant by a picture (photo) telling the story.
When I could'nt feel the adjuster tube I compared it with this photo of my 135 which I took when I had it open.( Then I understood why I could'nt find it. - It's been removed! I assume the previous owner who used the tractor for "hauling taties" had problems and chose to have it removed instead of paying to have it fixed.
Is it possible that a relief valve has been fitted to the original pump or would the pump have to have been changed as well?
I borrowed a guage yesturday and although I did'nt have the right adaptor I managed to quickly measure the pressure at just over 2500 on constant pumping before spilling too much oil.

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DavidP, South Wales

08-19-2013 13:21:09

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 Re: MF 165 Hydraulic problems in reply to MikeNL, 08-19-2013 08:33:50  

Hi Mike,
As my late father used to say "I see it all now....some of it".
If the PC has been removed then that would explain it. If you look at item 84 on the attached parts page that is the relief valve which screws into the upper right hand corner of the back plate of the pump.
It is cylindrical, about 5/8" (16mm) in diameter and about 2 1/2" (60mm)in length. You should soon be able to see or feel it.
With the PC components removed the PC control lever will have no effect in the PC quadrant. You will have full hydraulic pressure as expected in the Position Control quadrant.
The pumps are the same, the PC one has a plug in place of the RV.
2500psi is correct essentially for round rear axle tractors.

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