2001 GMC Sierra 1500 Pickup Owner's Manual - Page 305

Using PTO speed control in Preset Mode (Factory Setting): 1. Engage the PTO. 2. Select PARK (P) or NEUTRAL (N) range. Apply the parking brake in NEUTRAL (N) is selected. Torque Converter Clutch (TCC) lockup is not available in NEUTRAL (N) and is available only in PARK when engine speed is above 1100 rpm. 3. Make sure your foot is off the brake pedal (and off the clutch on vehicles equipped with a manual transmission). Select the desired engine speed for PTO operation. Please read the following Preset Mode information regarding operation. Preset Mode: PTO speed control mode is used for stationary applications. This mode provides a default standby speed of 800 or 850 rpm (depending on the engine/transmission combination) and two default PTO control speeds which follow: Using PTO speed control in Variable Mode (Mobile): 1. Engage the PTO. 2. Vehicle speed must be greater than 5 mph for vehicles equipped with gasoline engines or greater than 0 mph for vehicles equipped with diesel engines. 3. Make sure your foot is off the brake pedal (and off the clutch for vehicles equipped with a manual transmission). 4. Select the desired engine speed (with the foot pedal) and select SET on the PTO switch or with the cruise control. Using PTO speed control in Variable Mode (Stationary): 1. Engage the PTO. 2. Vehicle speed must be less than 5 mph for vehicles equipped with gasoline engines or at 0 mph for vehicles equipped with diesel engines. 3. Make sure your foot is off the brake pedal (and off the clutch for vehicles equipped with a manual transmission). 4. Select the desired engine speed (with the foot pedal) and select SET on the PTO switch or with the cruise control. D PTO Fast Idle Speed of 1250 rpm, or D PTO Fast Idle Resume Speed of 1700 rpm. Standby speed (800/850 rpm) is not to be used as a PTO control speed. Vehicles not equipped with cruise control will not have the resume speed capability. 4-83