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MF202 / MF35 brake pedals

C

Caryc

Well-known Member
My MF202 is the industrial model of the MF35 so I think the 35 would have the same setup.

Anyway the spring is broken on my brake hold down. I've ordered a new one but haven't received it yet. I'm trying to figure how this thing works.

In the first pic you see the ratchet locked in with the brake on. In the second pic, you see it released. What I can't figure out is this. Does the spring hold the toe release in the upward position? This would mean that every time you stepped on the brake, it would lock in place.

With the spring in place do you have to make sure every time you use that left brake that your toe is also holding the toe ratchet down to keep it from locking?

bc4W8JV.jpg

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The coil spring is the over center type, when lever is flipped up spring moves the lock pawl into the lock position. When locked and the lever moved back, spring will pull the lock pawl away when the pedal is pushed down to release the brake.
 
(quoted from post at 17:33:23 01/17/18) The coil spring is the over center type, when lever is flipped up spring moves the lock pawl into the lock position. When locked and the lever moved back, spring will pull the lock pawl away when the pedal is pushed down to release the brake.
Click to expand...

Does the spring hold the toe pedal up all the time? I don't get what you mean by "when the lever is flipped up". Or do you manually reach down and flip the toe lever up?

Is my second picture what the lever looks like in the normal driving position? Then do you reach down and flip the lever up and step on the brake to lock it? I'm having a hard time figuring out what exactly the spring does.
 
You lift the lever up and step on the brake pedal to lock the brakes on. Once they are locked on you can flip the lever back against the pedal and the brakes will still be locked on until you press the pedal again, then the spring will unlatch the dog and it will remain in the retracted position until you lift the lever up again and step on the pedal. Hope this explains it for you.
 
Man...I give up. I got the spring today and tried for an hour and a half to figure out how that thing goes in there. Please look at the pics below. I assume that the small arm of the spring goes into the hole on the pedal. Is the locking tab supposed to go on the inside of the spring like I have it in the pics or is it supposed to go on the other side of the spring?

The way I have it, there is not enough room between the spring and the tab on the outside of the pedal to slip over the brake pedal shaft. I could maybe spread out the tabs on the little pedal but then I couldn't get a cotter pin in the hole since the pin is not long enough for that. I assume that the long end of the spring hooks on the bottom side of the brake pedal shaft.

Can anybody figure out what I'm doing wrong? The parts book is no help at all. It just shows the exploded parts and not how they fit together. This thing should be so simple that it's driving me nuts.

vrTKxPd.jpg

pR6XblV.jpg

RgEieIi.jpg
 

Maybe it would help if I knew what an "over the center" spring was. I just can't picture what that spring does.
 
I'd take a pic of mine but I am housebound for at least 5 more weeks because of a compression fracture to my knee. Maybe someone else can get a pic for you. I can't remember just how it hooks up.
 
(quoted from post at 18:29:39 01/18/18) I can get a picture of how mine is this Saturday (if I can remember to take a picture(s) of it).
Click to expand...

Thanks PT, I'd sure appreciate it. Thanks also Phil.
 

I found this video on Youtube. The spring doesn't go over the pin at all. I can see it stick out of the bottom rear. I see that the little joggle in the spring hooks into the hole in the pedal. But I can't see where the other long leg of the spring goes, unless there is a hole in the backside of the pedal shaft for it to fit into.

Here's a pic of that spring. The long end of it is .870" long. Here is also the Youtube address of the video I found of the brake lock.

https://www.youtube.com/watch?v=d3FONXoVlNQ

WvVPqDG.jpg
You'll have to copy and paste the Youtube link. It won't let me post it as a link here.
 
I have never tried to upload pictures here but. the hooked end of the spring goes through the flip lever and the other end goes in a hole in the side of the brake pedal. Hope this helps.

Steven
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a254131.jpg
 

Steven, thank you so much for the pics. After watching the video at the link I posted, I figured there had to be a hole in the back side of that pedal shaft. It was the only logical thing I could think of. By the way, very good pictures.
 
Well, after seeing that video, I figured that there must be a hole in the inside of that brake pedal shaft and thanks to Steven's pictures they proved it. I went out and looked at it again this morning and I saw that the reason I didn't see the hole was because the visible side was clogged up with dirt. I guess there hadn't been a spring in there in years so with the hole plugged up with dirt it was hard to see.

Once I stuck a paper clip end in there to remove the dirt, the thing went together in about 30 seconds. I've got to say, it's pretty neat how it works. Lots more convenient than the 8N.

Incidentally, I now know what an over the center spring works. It's kind of hard to explain to someone but when you see it in person, it's simple.

Thanks again guys !!
 
Just came back to add this. I don't understand why people don't fix little things like this. But then again when I first got this tractor, you can see the boots on the gearshift shafts. The upper halves of plastic pop bottles and duct tape.

Also when I first got it, it was running bad and missing under a load. It finally got so bad that it wouldn't pull a box blade of dirt under full throttle. It just gave up and died. I finally found that it was the screen on the brass elbow on the carburetor. When I pulled it out, the screen filter came off the fitting. Holding it up to the sun, I couldn't even see through any part of it.

A pipe cleaner would only stick into the end about a quarter inch. The crap in there was solid. I had to twist the bristly pipe cleaner to ream the crap out of that filter. I couldn't believe how much crap came out of it, probably 50 years worth.

The engine now runs fine.

DSC03691.jpg
 
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