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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF 135 lift arms issue

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08-09-2019 18:40:19

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Hi all, new to the forum and looking for advice. I just got a MF 135 that had been sitting in a friends barn for years. The lift arms didn't work. We discovered the pump was bad. We put in a new pump and the lift arms will work fine without any weight or with a 450 lb counter weight on them. When we put a rotary cutter on and lift it the arms will go up, but will not go down.
We took the side plate off and the quadrant levers don't move the lever inside the tractor. We can move it forward with a screwdriver and then the arms come down. We tried moving the adjustment screws with no success. Can anyone offer any advice? Thanks in advance.

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08-10-2019 03:39:58

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 Re: MF 135 lift arms issue in reply to Dave_Mitchell, 08-09-2019 18:40:19  
I think everything is working as it should. We used a shop manual to make sure everything was together properly. I'm not sure if I can post a video, but I can take a picture today of the quadrant lever down and up and how the control valve responds. Everything moves freely until under load, the quadrant levers then move, but the control valve lever doesn't.
I need to ask my friend again, but I'm pretty sure it has pressure control. The adjustment screw comes out the front of the pump lever. I believe the manual mentions adjusting it.
The arms work with 400 or so pounds on them. As long as the trailing wheel of the mower sits on the ground the arms go up and down. Once the entire mower is lifted, then it will not go back down.

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DavidP, South Wales

08-10-2019 07:48:43

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 Re: MF 135 lift arms issue in reply to Dave_Mitchell, 08-10-2019 03:39:58  
Are you still testing this with the RH side cover removed? If so, make sure that the response quadrant lever is in the FAST position. If not it won't matter.

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DavidP, South Wales

08-10-2019 00:10:47

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 Re: MF 135 lift arms issue in reply to Dave_Mitchell, 08-09-2019 18:40:19  
Hello, if you have moved the adjustment screws then you may have already prevented the system from working in addition to whatever is wrong. You have mentioned SCREWS. Does the tractor have pressure control? Raising the Position Control lever on the quadrant should allow the pump lever to move rearwards. When you lower it it will push the pump lever forwards. If this is not happening there is a problem in the internal linkage in the cover, seizure or a bent frame perhaps. Ensure that the pump lever (control valve) moves freely.
DavidP, South Wales

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Brendon Warren

08-09-2019 19:03:22

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 Re: MF 135 lift arms issue in reply to Dave_Mitchell, 08-09-2019 18:40:19  
Could your quadrant levers be on the wrong side of the roller on the pump?

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