The PTO clutch shaft (A) is splined to the pump drive shaft of the hydrostatic transmission. It ties directly to the engine and rotates any time the engine is running. The clutch shaft is splined to the PTO hub and clutch disks.
When the PTO clutch (B) is engaged the clutch piston presses the clutch disks to the clutch plates and transfers power the PTO drum gear (C). The PTO drum gear is engaged to the PTO select gear (D) and drives it any time the PTO clutch is engaged.
The PTO select gear (D) is splined to the shift collar (F) The shift collar is internally splined in the front and rear and can be shifted to engage the rear PTO, the front PTO or centered to engage both.
When the shift collar (F) is shifted rearward the internal splines (G) and (H) engage the select gear splines (I) and the hub splines (J). The hub (J) has internal splines that connect to the rear PTO pinion (E). The rear PTO pinion engages the rear PTO idler gear (K) which engages the rear PTO output shaft (L).
When the shift collar (F) is shifted forward the internal splines (G) and (H) engage the select gear splines (I) and the mid PTO pinion splines (M). The mid PTO pinion is splined to the mid PTO input gear (N) which engages the mid PTO idler gear (O) which engages the mid PTO output shaft (P).
When the shift collar is centered the internal splines (H) engage the select gear splines (I). The internal splines (G) engage both hub splines (J) and the mid PTO pinion splines (M). Both the rear PTO and mid PTO are driven through their respective gears.