Reply to catsilver:
What normally holds the pin in position?
Jake: Page 8 of the Trackson HT4 Traxcavator Shovel Parts Catalog for serial numbers HT4 101 to HT4 2800 35C1 and up shows the following:
2 - Bushings (In EACH link assembly) Item IK6678 - the illustration from which this is referenced is titled " Bucket Control Linkage.
If the bushings and note Collar are worn, and under a repeated pivoting movement, the pin can walk out of the bore. Recommend you secure a Bunting Bushing Catalog - go to your local bearing supply house ~ Kaman bearing could help ~ and secure bronze bushing material to replace the worn bushing.
The book also shows 6- collars attached to the pins that secure the loader linkages to comprise the entire loader linkage assembly. If you need a scan of the parts illustration send me a PM with your address and will send one to you in the mail.
For repair, recommend you block the loader linkage with a stout piece of wood, remove any load from the bucket. Working safely use a bronze drift or better yet a piece or ironwood that is smaller than the hole the pin resides in ~ progress to tap out the pin.
It might be the case that both the pin and the bushings are worn ~hopefully only the bushing. Use a good digital micrometer and mic the pin and bushings and see if the mating surfaces are worn.
In close, always enjoyed your HT4 vids that you had posted. Keep up the good work!
RPeck