Splitting 123

[jbrewer]

This cub never had any brakes, so now's the time to try and fix that while I have the tractor split.



I have a large piece of brake relining material I bought quite some time ago. Has anyone shaped the pucks/pads to replace what is probably toast in there?

I probably have a 4" x 12" sheet of the stuff , that I think I probably bought from Fastenal, or some other industrual supply place based on a reference from here.


$16 for a 1" round disk is kinda spendy x 2 .

[darkminion_17]

You will have to remove the cover for the GDR to access the two pucks. Maybe the pucking thing is frozen up. Have you had the brake assembly apart yet?

edit... no GDR on a hydro, but it is very hard to change it in a hydro, prolly why they put external brakes on the later models...

[jbrewer]

Originally Posted by darkminion_17

You will have to remove the cover for the GDR to access the two pucks. Maybe the pucking thing is frozen up. Have you had the brake assembly apart yet?

Nope.... there's a first time for everything.


GDR? German Democratic Republic? Ahhh gear drive reduction? Will take a look at the service manual..... but this is a 123 not a 122.

[jbrewer]

While I'm sure others have done this, a search here on "123 brake" got zero hits and the manual is less than in depth. If the images in the manual were larger than 2" , it would be a help :-)


Now I think I know why there's no brakes here (and why the driveshaft is egged out)

[darkminion_17]

It's actually a little harder than a gear drive, drain the fluid, remove the pump, then the top plate, then the input shaft, yadda yadda yadda. I am sure the puck is just stuck stuck.
I added some pictures so you can see what a PITA it is change them. The parts breakdown is shown.

[finsruskw]

Probably the push rod is out of adjustment or seized/corroded in it's bore.
Check that 1st before needlessly (possibly) taking anything else apart.

[jbrewer]

I am sure that you're both right...corrosion/jammed .

Lew, what manual did you find that reference in, please? Perhaps it'll give me a clue as to how to free the pushrod that Fins suggests is frozen (and I bet you're right).


I was in the 123 section of the serv manual and sure didn't find that nifty picture you posted .

Thanks to you both!




"Swap the engine! How hard could this be" he said...

[darkminion_17]

The one I have is from here.

[ironman]

Here is a view of the whole shebang. What darkminion referes to as the "puck" is labeled brake pad retainer in this picture. It is like the piston in a car's disc brake. Usually they get corroded/rusted in their little cylinder that is in the "GRD" cover.
The puck is near impossible to get out unless you take the "grd" cover off and push it out from the inside. I have never seen niether the inner or outer lbrake pads that were worn out beyond use.

Be sure that when you drive the "pivot pin" out, that you have completely removed the adjusting bolt because it goes thru a groove in the pivot pin.. That is what holds the pivot pin in.

[jbrewer]

Thanks!

Lew: I did find that image now in the trans/differential section. I have looked at some length in that manual and I do not see any info on replacing the brake "pads" (buttons) on the 123. I think they either forgot it, OR they were to ashamed to document that you have to take the transmission apart to replace the pads! Good googly moogly this is turning out to be difficult. I hope I can get this back together. I suspect that the brakes may be fine as the jammed pushrod may have frozen long ago, protecting the pads as you say.

Iron, thanks for that drawing. My google skills have not turned up much applicable to this job, which is strange (and worrisome!)







Do I understand I have to get the differential out in order to get the pinion out?