Repair a Damaged CAT 631 Scraper Hydraulic Cylinder Rod | Machining, Boring & Welding

This video is a job we did to repair a damaged hydraulic cylinder rod and eye for a Caterpillar 631 Wheel Tractor Scraper apron hydraulic cylinder. The rod has scratching and the chrome is damaged so needs to be replaced. The cylinder rod eye is also out of shape and needs to be reclaimed to fit the bushing. To start, we machine and part the eye off the cylinder rod before reclaiming the eye by boring out in our milling machine, welding up and boring back out to spec. We also install the new bushing by press fitting in our 150T tonne hydraulic press. We machine up the new cylinder rod using 3” inch diameter induction hardened chrome bar. We need to machine both ends of the cylinder rod, the first end we are machining to fit the piston and cutting the external thread for the nut. The other end of the rod we also machine to fit the original rod eye, which is then MIG welded on to complete.
In this video we are using:

TM-26120G Lathe
BM-63VE Milling machine
HMP-150T Hydraulic press
WIA 500i Weldmatic welder

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Our channel is all about showing you real life machining work from our workshop on the Gold Coast Australia. We specialize in manual machining, hydraulic repairs and heavy fabrication for the earth moving, mining and civil construction industries. So if you're a machinist that wants to see some big gear in action be sure to subscribe to our channel right now. We upload new videos every week that show lathe machining, milling, welding and all the good stuff that comes from a machining workshop. If that sounds like something that you would enjoy seeing, then make sure to join us by subscribing!

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