Cylinder Disassembly & Repair for D8 Dozer | Machining & Welding

This video is a job we did to disassemble and repair a D8 Bulldozer hydraulic cylinder. This is the blade lift cylinder on the bulldozer and the rod is damaged and needs to be replaced. This shows the step by step process to disassemble and tear-down the cylinder, make the new cylinder rod and then re-assemble the cylinder. First we use our 150T Hydraulic Press to help with the disassembly and tear-down the cylinder. We machine up the new cylinder rod using a 3” inch diameter induction hardened chrome bar. We need to machine both ends of the cylinder rod, the first end we machine and cut internal threads to suit the piston & bolt. Then we machine the other end of the rod to weld prep by machining a bevel and drilling a hole for the eye spigot. The eye is welded on using metal cored wire and because the customer wants the rod to look as standard as possible we set it back up in the lathe and machine down the weld. We finish it off by installing a new seal kit and re-assembling the hydraulic cylinder in our press.

In this video we are using:
- Hafco TM-26120G Centre Lathe
- WIA 500i Weldmatic welder
- Metalmaster HPM-150T Hydraulic press

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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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