repairing a farmall cast iron belt pulley
i have a 8" by about 6 in wide flat belt pulley on my tractor that has a small chunk broken out of the outside diameter thats shaped like a quarter moon, about 3" by about 2". it is also cracked in both directions for about 4 inches around the diameter. without a picture to explain it, i need to repair the dang thing so i can use it with a buzz saw. its cast iron.
there are a few options available, after i drill a hole at the end of each crack should i :
braze the crack with oxy/act, pre-heat and slow cool
weld the crack with nickel rod, pre-heating, peening, post heating and slow cool
weld the crack with mang. bronze and the tig, again heat and cool
and then form a small chunk of mild steel to replace the missing part.
im not a "welder" but can do any of the above with confidence.
it is abouit 1/4" thick around the diameter and the speed will be maxed out at 550 rpm when in use.
They seem to be parting a lot of older tractors would it worth it to just replace it with a good used one?
If you weld it, my suggestion would be to O/A weld it and use cast iron filler rod. (as opposed to brazing)
I have done something similar, in my case is was a spoked cast iron helical cut gear, one of the spokes was broken and was missing a piece which made about a 3/16" gap in the spoke.
I welded the spoke back in at the good end, and fill welded the gap closed, all with cast iron filler rod. Then had to machine the mounting in the center, as I had to weld a mounting hole closed to do a proper repair.
Preheating and slow cooling resulted in no deformity, the gear was still true after completion.
get a pice of pipe bore it to be a press fit. heat it up and slip in on. let cool and you are good to go.
The pipe suggestion , while in theory , would work , is a poor suggestion , as the "flat belt pully" isn't truly flat, it has a slight crown to help with belt tracking. Any of the methods you mentioned should work, but my preferances would be Oxy/Acet brase /weld repair, then Tig W/ Bronze , lastly stickW nickel....Shawn
Which tractor is this on? I thought all the Farmall pulleys after 1939 (Models A, H, & M) were laminated, and not cast? Unless this is from the early numbered series (F-12/F-20 etc)
Last edited by Ohio Mike; 10-16-2011 at 10:15 AM.
this one is a "C". about a 1949 year. . .
on the cast iron rod welding, i think i have a few sticks andwill try it. my neighbor is a well driller and i;d bet he has proper pipe. and the crown could be machined in after pressing it on after turning the old pulley to a straight round. . . . thanks for the input. tomorrow is the day to try the oxy/act weld. im anxious to try it. . .
Originally Posted by Ohio Mike
Originally Posted by flylo
X 2. There's several listed on Ebay.
David,repairing pulleys and sheves especially anything with spokes is very tricky.I'd drill the end of the cracks wrap with tape for safety and keep your eyes peeled for a replacement.Old John Deere tractors seem to always have a little chunk out of the belt pulley from the wrench when adjusting the clutch. Frank C.
Super glue. Or JB weld, whatever you preferr.