MF-65 3 point height hard to adjust

[da.bees]

MF 65 lift will raise tandem disc and 6 foot cutter and doesn't oscillate up/down once set. Problem is when trying to set height, lift often doesn't respond or overshoots position. O-rings on stand-pipe looked pretty sad a few years ago when I lifted cover to adjust fingers rather than adjusting through side plate. Manual doesn't say what size O-rings to use. Anyone know the size # for O-rings?
Thanks

 

[Jim.ME]

You need two 195874M1 backup washers to go with the 195561M1 O-rings on the tube. Plus, there is one more 195561M1 O-ring that seals the block port to the cover port, separate from the tube. An online search using the part number make get you the sizes you need.

 

[da.bees]

Thank you Jim.

 

[MFEngineer]

Wear in the draft control spring/linkage can affect the position control. To test remove the top link, attach a chain in it's place connecting to the tractor on the long pin below the top link bracket so it's not connected to the draft spring. If the linkage behaves itself with this setup then you need to remove the draft spring, check and adjust then fit and install to the correct adjustment.

If the o-rings are leaking the implement will fall as soon as you stop the tractor.