MF265 Brakes issue

satchmo

New User
Nearside brake stays locked when used. Jacked it up and checked linkage, all that is fine. When pedal pressed it locks it, sometimes allowing it to go forward but then not back. Freed it off on adjuster nut. I checked the oil in the hubs and the one that is locking hardly had any in, so filled it to the level plug as per the other one. Hoping this may sort it. But anyone have any other suggestions or some exploded diagrams of what is actually in there please?
 
I am assuming your 265 is built in USA so although it has a square rear axle it possibly still has dry brakes? What is happening is that the expander in the brakes is worn and the 3 balls which seperate the 2 parts have worn into a square and thus it is sticking.....Wet brakes can also stick on for the same reason but not often...The wet brakes run in the transmission oil, chech the level on the dipstick by your right heel, beside the diff lock pedal....use super universal 15W30 oil. The hubs are seperate oil and use 90 gear oil........Sam,
 
Hello,
To add to Sam's valuable advice;
I actually refitted the LH axle housing to a MF 175 with dry brakes yesterday morning. This tractor had the same problem where the LH brake would not free completely when in reverse. All linkage was free and a new actuator and discs were fitted about 18 months ago. On seperating the actuator discs it was clear that excess heat had been generated by the slight dis-colouration of the balls. No wear was apparent on the ball ramps. To ensure that there was no wear step the ramps were cleaned with a very light application of a Dremel electric grinding tool and stone. They were finished with a Dremel emery cylindrical bit.
If you look inside the axle housing there the actuator locates it has to slide slightly as it expands. There was rust on the contact surface and I believe that this caused the brake bind. By removing the rust and build-up and smearing a little copper grease on the contact areas this cured the problem with this tractor. Only a small amount of grease should be used to ensure that it does not reach the disc faces. This 'clean and grease' procedure has been successful on MF, International and Leyland tractors.
Let us know what you find.
DavidP, South Wales
 
Hi both and thanks,

It is a UK tractor so I was assuming wet brakes and that was what the oil in the hubs was? But perhaps not then, how do I tell?
 
Hello again,
Stand behind the tractor and look at the control beam where you attach the top link. Either side at that level where the axle housings are bolted to the centre housing you will see 5 notches in the axle housing on each side. These notches are present if you have oil immersed brakes. If you have dry brakes each axle housing will have a double flange and no notches. The inner flange is the disc which separates the oil in the centre housing from the dry brake discs next to it. As Sam has said having problems with the oil immersed brakes is very rare. Is there any chance that the tractor has been run VERY low in oil and the brakes used enough to cause them to overheat and possibly warp the discs? There are 5 sintered brake discs with metal inter-plates. If these have warped it will have the same effect as applying the brakes.

DavidP
 
Hi Dave and thanks,
Had a quick look and not quite sure what I am looking for. There are some indentations where the axle meets body, I can see 3 need to clear out behind the hitch lever to have a proper look. Anyway I can send you a photo somehow?
Tractor does not get much use, hardly any over winter and transmission oil is fine and never run low.
 
Hi, this view is of the right hand side. The number of notches signify the number of brake discs that are fitted. This is from a 265. The rod is part of the automatic hitch linkage that we have in the UK in the main.

DavidP
a228537.jpg
 
Thanks Dave, that is exactly what I have. So wet brakes, with one sticking. Looks a lot of work to get to it as cab is bolted to the axle and it doesn't look like bolts will clear unless cab removed. Anything I can try to loosen things up at all??

Geoff
 
Hi, before you go into the axle housing I think it would be worth looking at the epicyclic unit. I suspect that your oil loss may be connected to the problem. I suspect that the cage of a roller bearing may have collapsed. This could well allow the axle to turn in one direction but lock in the other. The hub is heavy so be careful. Remove the wheel that may show something when you turn it by hand. Just to confirm that it is the left hand side. If you remove the axle the diff may come with it so make sure you leave it behind.

Wet brakes rarely give any probs so I think that you will have to look elsewhere. Let us know what you find. Regards David P
 

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