The pump is mounted on the rear, driven by the shaft that drives the input side of the PTO gearbox. it is independent of the transmission. There is a two stage clutch so you can stop the tractor and keep the hydraulics and pto running. you can also stop the PTO and keep the hydrualics running by using the neutural on the main PTO lever. There is a small lever by the left heal of the operator, about 4" long that can be used to disengage the pump and PTO. IT is not uncommon to inadvertently bump this lever and loose hydraulics so I suggest making it about 1.5" long. It is not normally necessary to disconnect at this point anyway, but with the short lever it could still be done if needed for some reason. This is on the TS series, The KM do not have this lever at all. It does not take long for the operator to get used to leaving the PTO clutch engaged when using a loader. The engine mounted pump is used for power steering only so loader or three point lift demands do not affect steering as sometimes happens with the Jinmas with single pump.