Yes, first gear with the engine running around 2500 RPM is 540 PTO RPM. If you slow down the engine the PTO slows down. The 276 operators manual states the working range is 1800-2600 RPM, since the 2310 engine is the same as the 276, I would guess the 2310 has the same operating range. I am not exactly sure the other PTO speeds but the only time I use a faster speed is tilling my garden after I have broken the ground to break up the clumps then I almost always use #2.