Sprocket pulling advice for D47U

Sasquatch -- The setup you have looks good to me, best part is you are well away from things - have you thought about hanging something to help block flying debris if something goes askew? Maybe you are "hiding behind the tractor? - cts

ctsnowfighter - I'm always standing on the other side of the tractor when applying the pulling pressure, the only time I'm ever close to the puller is when I'm giving it the first few pumps to cinch the slack out of the bars enough for it to hold itself in position. I've done enough pressing & pulling over the years to know that when energy suddenly releases, the flying pieces are already well past you by the time you even know what happened, let alone be able to react to it. Closest call I ever had was when pressing a bearing out of a cast iron housing - just after the bearing started to move, the housing decided to blow up into several pieces. All I heard was the loud bang and it suddenly disappeared - one piece just grazed my arm enough to leave a tiny red scratch, but I was otherwise unharmed. The boss had a press cage built right after that close call lol!

Those whom have never experienced or realize the tremendous energy dissipated when those pressures are released are up for an awakening. Instantaneous is an understatement as to how quickly things happen under those loadings. -- cts

we were pressing a seized pin out of a pivot once it took 40 ton and some heat and a lot of possum piss to get it to move. when it let go it made such a sharp bang my grandfather who was industrially deaf and a 100 metres away heard it.

Measuring force is done by many different methods. When "we" speak of TONS of pressure to pull a sprocket or other object (pins & bushings in track rails - etc), it is difficult to comprehend the massive amount of energy being released instantaneously. Provoking some thought - Consider that many high-powered rifles have chamber/throat pressures in the realm of 50-60 thousand pounds per square inch (25-30 tons). Even though common technology still uses LUP (Lead Units of Pressure) or CUP (Copper Units of Pressure) as measurements. We are more familiar with Pounds Per Square Inch or Foot Pounds of torque. Consider that pressure upon firing is contained for a very short period of time within the chamber/barrel and the resulting force propels that projectile at such high velocity and results in a high impact energy of the projectile. Now - think in TONS of PRESSURE - 100 TONS (89+UK) = 200,000 POUNDS. Those forces far exceed the chamber pressures in the 16" guns on board the Iowa Class Battleships of WW II!. Quite a comparison to think about! Uncontained and un-directed - miss-guided objects ("projectiles") are a threat to life and limb. Please think, use proven methods and tooling - your safety and that of others surrounding you and those depending upon your support are factors that each of us must consider. -- CTS