2001 GMC Sierra 1500 Pickup Owner's Manual - Page 304

Power Take-Off (PTO) (If Equipped) To engage a PTO on a vehicle with a manual transmission: 1. Hold the clutch pedal down. 2. Set the parking brake. 3. Shift the transmission into NEUTRAL (N). 4. Engage the PTO. Refer to the manufacturer's or installer's for instructions on electrically engaged PTOs. 5. For mobile operations, shift the transmission into the gear you want, apply the regular brakes and release the parking brake. For stationary operations, leave the parking brake applied. 6. Release the clutch and regular brakes as you normally would. When the clutch is released, the PTO will start. 7. Turn the PTO rotary switch to ON. To engage a PTO on a vehicle with an automatic transmission: 1. Engine speed must be less than 1000 rpm. 2. Turn the PTO rotary switch ON. NOTICE: If you have a PTO that will exceed 35 hp installed on your vehicle, it could damage the transfer case or transmission. When having a PTO installed on your vehicle, make sure that it will not exceed 35 hp. Before using a PTO, refer to the manufacturer's or installer's instructions. NOTICE: Using a PTO while operating in one place before the vehicle has reached normal operating temperature can damage the transfer case or transmission. If you will be using the PTO while operating in one place, drive and warm up the vehicle before using the PTO. 4-82