Make sure those are set correctly for position control. It tells the settings for the lift to be in either draft or position control. Here is a link to a 135 operators manual. Hopefully it has just come disconnected & easy to fix. The brush cutter, it lifts when properly hooked to the 3-point arms, maybe too much weight for it to lift on a boom pole, even using just position control. They are here on the web somewhere I'm sure. I can't exactly picture your linkage and have no drawings. Still would need to have the draft control rod stabilized in the "disable" position somehow. You can probably fabricate one yourself since all it does is provide a solid place for the top link to anchor to rather than to the spring. MF sells a kit for doing that (at least for later models I use one myself) and I do not know about the 135. That means needing a way to attach the top link to the tractor chassis without it being attached to the draft control spring. If you do not need draft control (not plowing or tilling) then you should be able to disable the draft control entirely by disconnecting the connection to the top of that fat heavy spring underneath the rear of the seat. If you can push on the end of the draft control rod and get the 3pt to lift, it sounds like your linkage from the draft lever to that rod has become disconnected (?) I would check that first. When it is operating correctly, the draft lever needs to be at one extreme or the other (up I think) which in effect disables draft control. Not sure I can help but the old MF system of 2 levers - one for position control and the other for draft control - is old as the hills and still in use on MF tractors today.
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