Making a NEW Cylinder Rod for 90T Excavator | Manual Machining
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 Published On Nov 4, 2022

This cylinder rod is damaged and has a very unique failure! This is the dipper cylinder rod off a 90 Ton Caterpillar 390 Excavator and part of the rod has shattered and cracked so we need to make a new one. This video shows the step by step process to make the new cylinder rod including machining, threading and welding. We start by machining the eye off the damaged rod in the lathe. We then use a new 150mm diameter piece of MnVS6 induction hardened chrome bar and turn it into the hydraulic cylinder rod before fitting and welding on the old eye. First we rough machine down one end of the rod before finish machining the end for the piston, cushion bearings and nuts. We then cut two external threads before flipping the rod to machine the other end. We machine a spigot to fit the rod eye and a taper for weld prep before fitting and tack welding the eye in position. We finish the job by welding the eye on and get it ready to be sent back to our customer

In this video we are using:
- Hafco TM-26120G Centre Lathe
- WIA 500i Weldmatic welder

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