Driver Controls ENGINE FAN ENGINE BRAKE 08/22/2011 f545818 Fig. 4.17, Engine Fan Switch 07/18/2011 f545792 Exhaust Brake Switch Fig. 4.18, Exhaust Brake Switch NOTE: See Chapter 10 for detailed information about exhaust brake operation. An exhaust brake is an optional auxiliary braking sys- tem that assists but does not replace the service brake system on vehicles with Cummins engines. The exhaust brake may be used in conjunction with the service brakes in off-highway and mountain driv- ing as well as in traffic or high-speed highway driv- ing. Exhaust brakes are not intended for use as the primary braking system during vehicle operation.
IDLE SPEED To turn the exhaust brake on, press the upper half of the rocker switch. See Fig. 4.18 . 08/22/2011 f545820 The exhaust brake turns itself off automatically. In addition, depressing the accelerator or clutch pedal deactivates the exhaust brake. The ABS, when ac- tive, also deactivates the exhaust brake. Fig. 4.19, Idle Speed Switch (Cummins engines) 2. Press the PTO switch. See Fig. 4.20 . When the light is steadily illuminated, the PTO is engaged and ready to operate. In stationary mode, the vehicle must remain in neutral with the parking brake set. Idle Speed Switch The idle speed switch may be installed on vehicles with Cummins engines to change the idle speed of the engine.
See Fig. 4.19 . 3. To activate the mobile mode, shift from neutral to reverse, 1st, or 2nd gear. The clutch will open and the PTO will disengage for a moment. Power Takeoff Controls 4. Touch the accelerator pedal to close the clutch and engage the PTO in mobile mode. The PTO may be operated with the transmission in re- verse, neutral, 1st, or 2nd gear only. Engine power takeoffs (PTO) are devices used to tap into engine power to run auxiliary devices, such as hydraulic pumps that power additional equipment. The following instructions are general guidelines for operating a PTO. NOTE: Do not attempt to change gears while the vehicle is moving. The transmission will ig- nore the request. 1.
Set the parking brake and put the transmission in neutral. 4.9