On the machine shop's rig, they just have a sprocket welded to a sleeve that fits over the end of the crankshaft and a roll pin driven through the hole where the crank pin was.
A chain will not hold up to full-throttle operation very long. They basically idle their tractor around the yard and use it for loading and unloading iron, etc.
I don't have a pressure relief valve on my system, but I DO have a priority flow valve so that the power steering gets oil first. Northerntool.com still has them for around $85 or so.
Here are more pictures that I have of the machine shop rig:
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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