This video is Part 1 of repairing a damaged hydraulic cylinder for a Caterpillar 651 Scraper wheel tractor. This is the Apron lift cylinder on the machine and has been damaged by something causing massive amounts of scratching inside the barrel and on the piston. In this part 1 video we start with the old cylinder barrel and set up in our lathe for machining out the welds to remove the barrel end and head flange. We use welding on the head flange and heat with flame torch to expand and remove. The head flange needs to be bored out, built up with weld and then machined out to suit the new barrel tube. We then set up the new steel tube in the lathe for machining the outer diameter and boring out the inner diameter to match OEM standard and interference fit for head flange. We then measure and drill in oil port holes into the new barrel and heat up with flame torch ready for interference fitting the head flange.

In this video we are using:
- TM-26120G Lathe
- BM-63VE Milling machine
- WIA 500i Weldmatic welder

Watch part 2 here: https://youtu.be/ZGRoZNs0KU4

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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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