I put the hydraulic fluid in the wrong place. There is a sticker that says add hydraulic fluid here, and I removed the cap and filled that chamber with hydraulic fluid. Oops. I think the correct way to do it is: once you have the cap off, separate it into two pieces. Put the small reservoir back on the machine, fill it with hydraulic fluid, then put the gasket and cap back on top of it. The manual says 100 ml and I think that is the correct amount.This hammer is lighter than I'd like. I was using it to drive 1.25" pipe and it needed two adult men's weight on it to get anything accomplished.The Temco 2" bit works in this hammer, but only the bit with the round end (the solid hex shaft bits, like the one Bosch sells, do not fit this- I think they fit a larger hammer instead)