rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,680
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I just measured the sway lock pin on the M59. It gets a lot of wear since we often use the BH bucket and thumb to carry rather large rocks from the surrounding mountains down for landscaping.
Pin size after 20 years is 1.0045". Holes in castings are slightly egged, 1.045" to 1.058"
So basically we are looking at a one inch pin with an impressively hard plating. It shows no wear.
Originally made to go into two holes (double shear) with twenty thousands clearance all round. Holes now worn about an additional 0.005" only in the stressed area.
That's a tight fit. The clearance needs to be tight to prevent any side swing.
If your new warranty part measures substantially differently, consider flanged bushings. Use iron- impregnated bronze to handle your low speed shock loading. McMaster has those bushings for a few bucks.
BTW, your photo of the casting looks good to me. Hard to know for sure without more examination, but my first impression is that the casting quality is excellent. That's backed up by the fracture angle - that angle shown is typical for a good quality material that is simply stressed beyond its yield strength. Basically that's a textbook fracture.
rScotty
Pin size after 20 years is 1.0045". Holes in castings are slightly egged, 1.045" to 1.058"
So basically we are looking at a one inch pin with an impressively hard plating. It shows no wear.
Originally made to go into two holes (double shear) with twenty thousands clearance all round. Holes now worn about an additional 0.005" only in the stressed area.
That's a tight fit. The clearance needs to be tight to prevent any side swing.
If your new warranty part measures substantially differently, consider flanged bushings. Use iron- impregnated bronze to handle your low speed shock loading. McMaster has those bushings for a few bucks.
BTW, your photo of the casting looks good to me. Hard to know for sure without more examination, but my first impression is that the casting quality is excellent. That's backed up by the fracture angle - that angle shown is typical for a good quality material that is simply stressed beyond its yield strength. Basically that's a textbook fracture.
rScotty
