New Hydraulic Piston [Video]

This is a short video of a piston Tom machined for a hydraulic cylinder. The hydraulic cylinder came off of a tree delimber. A logging company tried to remove the original piston from the ram to reseal the gland nut. In the process, the piston seized or welded onto the ram. As a result, the piston had to be split using a cut off wheel to remove it.
Tom machined a new identical piston as a replacement. He started out with a piece of four inch steel round stock and turned the OD on a metal lathe. He then cut out the wear rings and seal ring. Reliefs also had to be cut in.
Tom then bored out the center of the four inch round stock. He had to over bore part of the piston for a minor diameter to fit a one and twelve eighths, five thread per inch cylinder end.
The holes on the ends were milled out to fit a spanner wrench.

A few of the tools Tom used to complete this project include:  metal lathe with cooling oil, internal threading bar which is a boring bar that holds the threading inserts, thread gauges, a micrometer & calipers, also a depth gauge to measure off the old, damaged piston.

The completed new piston fit on the hydraulic cylinder like a glove… another job well done from Trade Tool Innovations!