Master Link Problem

I have seen lots of them welded over the years at the shop so you can weld yours till you decide to fix it correctly.

On my ole junkyard relic D2, the master link PIN on the right side was replaced with an equipment hitch pin with flatwasher and cotter key retention. It's held for a bunch of years.

Al

Thanks to all for the ideas.
Ed

if it were me i would weld a washer to the end of the pin rather than try to weld the pin to the link, like others have said the link is hard so the weld will not usualy hold to it very well

Ed - Never seen a worn, welded pin, stay in a track for very long, if given some serious amount of work.
The main reason being, that the constant rotating/twisting action of the links is like twitching a piece of wire .. sooner or later it breaks, with the constant working back and forth.

Here's a neat trick that works, and was shown to me, well over 40 years ago, when I ran a beat up ole-A-C, that had more pins falling out of its 120% worn undercarriage, than would fall out of an open dressmakers kit.

Run 4 beads of weld lengthwise on the pin, the same length as the pin boss is thick.
Take the pin to your big bench grinder, and with your best bench grinder sculpting skills .. grind the beads of weld into wedges that taper each side about 30° .. and which taper from the full height of the bead, down to nothing at the inside end.
If you're a pro at sculpting with a 4" angle grinder, you can use that instead. Just ensure the pin is held firmly.

Once you have those 4 beads sculpted to neat wedges .. drive the pin in flush.
It might take a bigger hammer than normal, but that pin will stay there longer than any welded pin, due to the tight wedging action of those weld beads. It will come loose again eventually, as nothing will keep a worn pin tight forever .. but it is by far the most successful method of keeping loose pins in.

Oz
Thanks for the idea.
Let's see if I got your solution correct.
The welds run from each end of the pin and they are ground lower toward the middle of the pin?
That will take a big hammer!

Ed

P.S. My daughter lives in Melborne, she married a Aussie and moved "down under". You have a beautiful country!

Seen people putting runs of weld on pins and leaving too much on,driving them in and cracking the link,even though pins are an interference fit they are round and will have no high spots,a weld run left high will crack the link like glass,there is also the problem of having to drive the built up end through two links.much easier and better to put some heat on the end of the pin till its cherry red,have somone hold a sledge to the other end and peen it,as you do the pin will swell up and be a tight fit in the link and I can guarantee it will not come out.
AJ

ed - You only need to run the beads of weld on the one end of the pin .. the outside. And yes, the beads are highest at the outside edge, and taper down towards the center of the pin.
No need to have them too high, at the outside end .. about 1/8" - 3/32" at the outside will be plenty.
Make sure the beads end up, a smooth and even wedge shape, right along their length .. and that they are all parallel.
Use a low hydrogen 7018 rod for the welds .. and if you're not satisfied with the wedges alone .. you can still run a couple of short beads on the end of the pin and pin boss, to assist with securing it.


AJ - You must have been working with some crap aftermarket undercarriage, to have links that shattered .. or the weld bead wedges were huge.
Cat links are made of extremely tough steel, that are deep induction hardened on the wear areas .. such as the rail .. but the pin hole area isn't hardened, and that tough metal will stretch to accomodate the wedges.