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MF 65 brakes

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J.O.

06-15-2003 09:08:00




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My friend has a MF65, The brakes would never stop it. Now the left brake is hanging up??
I unhooked the linkage and he is moving now.
Is there anything I should do before tearing this thing the whole way down? How can a brake not stop
it with the pedal,but hang up by itself?

Thanks for any input J.O.




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Big Dean

06-16-2003 07:29:16




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 Re: MF 65 brakes in reply to J.O., 06-15-2003 09:08:00  
The MF65 has disc brakes not like the disc brakes on a car though. These have two round disc one on each side of the actuator the actuator is to plates that have 5 steel balls between them that set in holes that have a taper groove into the hole the balls set in. The linkage is hook to the actuator plates so when you apply the brakes one moves one way & the other moves the other way. This cause the steel balls to move up into the taper grooves spreading the plates apart squeezing actuator plates against the disc and forces the disc out against the contact area in the axle housing and the carrier plate. If the disc get worn enough the steel balls will move out onto the flat part of the actuator plate and the returns spring cannot pull the plates back together causing the brakes not to release. Broken return springs will cause them to not to release also.

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Dusty

06-15-2003 14:02:05




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 Re: MF 65 brakes in reply to J.O., 06-15-2003 09:08:00  
If it works like the 135, and I think it does, The brakes have probably been adjusted incorrectly in the past and you will need to start over. Most people will adjust the brakes at the linkage, effectly making it longer. These brakes work like some automotive drum brakes. There is an adjuster inside the drum that you access through an oblong hole that faces the rearend housing. The adjuster will be spun up or down, moving the brake bands closer to the drum. Between the bands is an oval shaped piece that pushes the bands apart and aginst the drum when the brake pedal and rod are applied. What happens when the brakes are adjusted at the linkage instead of at the hub is the spreader gets constant contact with the brake bands and when the brakes are applied the spreader is pushed beyond normal range and may not be able to return to its regular position, locking up the brake. This may be difficult to understand without seeing the layout of the pieces mentioned, but once you do, it makes sense. The owners and/or service manual will do a better job of putting this procedure into words, but it couldn't tell you that improper brake adjusting can cause your brakes to lock up altogether. Sorry if my description was hard to follow.

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Ali, fae Crieff.

06-15-2003 13:09:03




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 Re: MF 65 brakes in reply to J.O., 06-15-2003 09:08:00  
J.O. Funny thing coincidence is! my 65 has developed the very same thing although the right brake locks up if I press the pedal too far.
I can release it by reversing but If I don't it is on so hard the tractor stalls.
I have not investigated it yet but it has been suggested that it just needs adjusting up as the brakes work on a cam which is probably going past it's proper position, but hopefully someone else can confirm or suggest something else.
'Cheers' Ali.

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