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MF 90 WR Brakes Locking in Reverse

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Glen MacLean

07-14-2014 16:11:31

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Last week the right side rear wheel brake on my MF 90 WR Gas was sticking a bit, but only when I tried to back the tractor up. It was not an issue when I went forward. Today when I went out to move it to remove the front end loader, the right rear wheel will not release at all in reverse. It will still move forward. Any tricks to unlock this brake so that I can get the loader removed, and move the tractor into my shop so I can take off that wheel and repair whatever is wrong?

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07-14-2014 20:04:08

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 Re: MF 90 WR Brakes Locking in Reverse in reply to Glen MacLean, 07-14-2014 16:11:31  
Back off the adjusting nut and tap the rod in. The actuator unit inside may have one or all three return springs broken and rusty ramps and balls will cause trouble also.

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Brendon Warren

07-14-2014 16:16:42

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 Re: MF 90 WR Brakes Locking in Reverse in reply to Glen MacLean, 07-14-2014 16:11:31  
It might not be the brakes but the planetary. My super did that and gears were all tore up inside.

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Glen MacLean

07-14-2014 16:30:38

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 Re: MF 90 WR Brakes Locking in Reverse in reply to Brendon Warren, 07-14-2014 16:16:42  
I suppose the planetary gears could be the issue. I'm trying to visualize how the wheel would rotate in the forward direction if these gears were all mangled to the point it was locked in reverse. Maybe I don't understand enough about how the planetary gears work.

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07-14-2014 18:04:41

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 Re: MF 90 WR Brakes Locking in Reverse in reply to Glen MacLean, 07-14-2014 16:30:38  
i had a super 90 diesel w/ perkins. disconnect brake actuator rod so you have no brakes. if you still have problems it is probably internal. however i would also remove axle and inspect b4 tear down of other components.

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Glen MacLean

07-14-2014 18:17:52

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 Re: MF 90 WR Brakes Locking in Reverse in reply to jim_uny, 07-14-2014 18:04:41  
Disconnecting brake actuator was looking like the thing I would try next, unless somebody else had experience with something they knew would be better.

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