PTO Clutch Disc DIY

PTO clutch discs are expensive, to the tune of $70 and up plus shipping. Here I am replacing the clutch material with a part number B2354R used in JD B 50 520 530 as a transmission clutch disc. The disc is 7" in diameter compared to the factory 6.75" which is not a factor as it causes no issue with interference with any other parts. This part is readily available on ebay and numerous other places for less than $20. It just requires a little more time to install.

First remove the PTO pulley for access to the friction disc retaining bolts.




Now is a good time to check the grease seal and bearings for wear. If the disc has grease on it do yourself a favor and replace the seal!

Here is a good example of a bad seal.


After removing the clutch disc drill out the back of the rivets and punch them out to remove the disc from the backing plate.




Now rough the surface of the backing disc with a sander or grinder so the adhesive will have something to grip.


Measure and mark 1.3 inches from the edge of the center hole outward in several locations then place the new disc over the marks and outline the circumference.

Part II

Apply JB-Weld or you favorite epoxy to the area outside the mark on the backing disc.


Carefully place the new disc on the backing plate aligning it with the center marking.


Apply light pressure to the assembly and allow 24 hours to cure. A press is great if you have one but a brick would work if that's all you have. Just be sure that the disc stays centered!


After 24 hours your new disc is ready to reassemble and you saved >$50 in the process!

Thanks GT! I've replaced three of these so far, a C-101, C-161 and a 416-8 and all perform great for a modest amount of cash compared to the factory replacement cost.

I have made 3 of these but i used clutch material from McMaster carr and had to cut it out off a square sheet. This is a lot easer and about the same price. If you don't have a press, just park a tractor over the clutch disk for the night. Just be careful not to shift the material.