mf35

[genewatson]

I am working on a MF35 1964 for a friend.He started the tractor with a rotary mower on it. He said the mower came up as usual than fell down and would not raise again
I pulled the tranny cover off and found a busted work cylinder split from end to end.The pump will pump but does not push fluid up the standpipe. I can put my finger over the outlet and feel nothing with the pump running.Ther seemed to be some agitation of the fluid.
I have the pump out and find nothing wrong. I am thinking the relief valve must have stuck open. I have ordered new rings and seals and a new relief valve. Am I missing something?

 

[Phil Tibbetts]

How did the cylinder get split? Sounds like the 3 point hitch lever was put in the constant pumping position by mistake. I am speaking from experience on my 135. It happened to me and there was a big bang when it let go.

 

[Anonymous-0]

Hi,
I had prblems with my hydraulics. I found a DVD on the internet that shows all the pump refurbishment and set-up and has a troubleshooting section. It had a slight home-made feeling to the film, but the technical content and description of how to repair the system was good. Found it at a website called vintagetractorengineer.

 

[DavidP,South Wales]

Hi,
There is no 'Constant Pumping' position as such on a 35. Continuous oil flow is achieved when the DRAFT lever is fully raised. Cylinders split through shock loading on the 3-pt linkage, bad adjustment or sometimes when removed and not tightened down squarely. Bad adjustment is the most likely due to the quadrant Position lever stop being moved to gain an extra inch or two. Maximum lift occurs when the linkage is locked up instead of leaving the correct amount of clearance between the max you can lift by hand and the max that the system will lift upwards.
If the pump has been stripped and nothing obviously broken or bent then I believe that the relief valve may have been partially blowing due to bad adjustment of the Position lever stop.
The oil can overheat and cause the control valve to stick. In the efforts to make the linkage work it the pump lever may have moved into the discharge position and remained there. Is the pump lever free now. If you connect a piece of plastic pipe into the pump outlet and blow down it you will feel resistance. As the pump lever reaches the discharge position that resistance will disappear. This is a simple bench test for the control valve operation.
DavidP

 

[genewatson]

thanks for the info. I am not familiar with this lift how should the draft levers be positioned for mowing?