I'm confused, my B2710 will move if I'm standing on the ground and press on the HST pedal (and the engine is running). Seemed strange, what's the point of a seat safety switch if the tractor can drive off without me. Looked under the seat and sure enough there's a switch there that seems to be working, at least it clicks mechanically when I operated the plunger. So I look in the owner's manual and shop manual and was totally surprised to find no evidence of a seat switch, either in the description or schematic. It calls out 3 safety switches: PTO, HST pedal and clutch. Could the schematic be calling it something besides a seat safety switch? The other safety switches are clearly and logically labeled and do what I expect.