Brake overhaul

[Gary Sweat]

Has anyone ever removed the brake drum housing from the transmission case? I removed the 4 bolts but it only move out about a 1/4" and then the shaft binds up and won't come out any farther.

I can't tell from the diagrams that there is anything other than the 4 bolts holding it in place.

 

[winston1]

I'm not sure but I think the differential lock shift fork may go through that housing. Try moving the differential lock foot pedal and move the brake housing at the same time and see if you can feel them meeting. #85 in the attached meshes with #60. May not be what is holding it. Just looks like it could be. Yanmar Tractor Parts: TRANSMISSION_INTERNAL

 

[Gary Sweat]

I'm not sure but I think the differential lock shift fork may go through that housing. Try moving the differential lock foot pedal and move the brake housing at the same time and see if you can feel them meeting. #85 in the attached meshes with #60. May not be what is holding it. Just looks like it could be. Yanmar Tractor Parts: TRANSMISSION_INTERNAL

I'll give that a try. I was hoping someone had done this before as I didn't want to have to pull the 3pt housing off just to see what might be holding it. The parts are coming in tomorrow and I wanted to get it all back together this week but I'm stuck trying to get the housing off so I can replace the bearings and seals.

Both brakes filled up with transmission oil when I over filled it so I thought I might as well just replace everything at one time and be done with it. Turns out to not be so simple again.

 

[careyo63]

http://www.fredricksequipment.com/Portals/0/catalog/rear axle and brakes.pdf

Looks to be a Snap Ring on this Brake Diagram.

Carey

 

[Gary Sweat]

http://www.fredricksequipment.com/Portals/0/catalog/rear axle and brakes.pdf

Looks to be a Snap Ring on this Brake Diagram.

Carey

Thanks for the pdf Carey. My setup is the one at the bottom of page 143. Looks like the whole housing is supposed to slide out but it's not. May be getting stuck on the splines in the gear. Looks like I'm going to have to take the 3pt off to see where it's binding. I hope I can get to that snap ring from inside.

 

[Gary Sweat]

Took the 3pt housing off and the problem became clear. The entire PTO and rear axle has to come out before I can remove the brake drum housing. The PTO assembly has to come out to get to the axle drive gear snap ring. The main axle drive gear (big one) sits half way inside the brake housing.

Not what I was hoping for and not very clear in the service manual.

 

[clemsonfor]

lppks very clean in there the fluid must have good cleaning properties.

 

[Gary Sweat]

lppks very clean in there the fluid must have good cleaning properties.

I've just run the standard TSC 303 oil. I change it every year in the spring right before I start using it again for the summer. The poor thing looks rough on the outside but so far everything I've looked at inside is in good shape.

This brake job is turning into an all out disassembly effort on the rear end. All I wanted to do was replace a bearing and a seal. Somehow the service manual didn't think it was important enough to include the steps. Oh well, at least I've found a few things that need attention. (a frozen axle hub on the axle and the 3pt lever bushings are dry).

I do like how the entire PTO unit comes out as one piece and exposes the entire differential. If I'd know that, I wouldn't have taken the 3pt off.

 

[Gary Sweat]

Success! Finally got the brake housing out (and most of the differential too). Found the cause of the oil leak. The seal collar was slowly corroding until if finally got to the seal surface and cut the seal. It wasn't leaking until I overfilled the tranny and then I guess it couldn't handle being submerged in the oil and started acting like a pump when the shaft was turning.

The little black line on the old collar is part of the seal surface ground away. Now I just got to get the old bearing out and the new seals and o-rings installed and hope I can remember where all of the parts go back.

Oh yea, still got to deal with the stuck axle hub too:confused2:

 

[careyo63]

My Hub was on ther pretty tight. The Bad seal looked to be Orig. My El Cheapo HF 1/4" Dr. wouldn't budge the Hub. I was able to rent a 3/4" Dr. gear puller from Orielly's auto parts and used my 1/2" Impact with a reducer. Popped right of. Worse case you may have to heat it up. If you had to pull the Axel shouldn't be much to it.

Carey