SHROUD AS 2653652 - Caterpillar

Manual Retarder Control (Lever)
Do not use the retarder control as a parking brake or to stop the machine.
When you quickly apply the entire retarder capacity on a slippery road, the wheels can lock and the transmission can downshift. This can cause serious damage to the power train.Gradually apply the retarder control on slippery roads in order to prevent the wheels from locking and the transmission from downshifting.
Illustration 1 g01242261
(1) Manual retarder control lever
Manual Retarder Control (Lever) (1) - The manual retarder control (lever) is used to regulate the machine speed when traveling down a grade. Following is the lever operation:
Move the lever rearward to apply more retarding force and slow the machine
Move the lever forward to reduce retarding force and allow the machine speed to increase
When the lever is in the full forward position, the manual retarder is offAutomatic Retarder Control (ARC)
Illustration 2 g02174275
(2) Automatic retarder control switch
Automatic Retarder Control (ARC) (2) - Push the top half of the switch to select the ARC system ON position. This action allows the machine to maintain a constant downhill speed. Push the bottom half of the switch to select the ARC system OFF position. Vehicle and engine speed is automatically regulated when the proper gear is selected during ARC operation. If necessary, use the manual retarder control to apply more retarding force during the operation of ARC.The ARC should remain on during normal operation. When switch (2) is placed in the OFF position, the ARC will not control engine speed during normal operation. However, if the engine speed becomes too high, ARC will perform engine overspeed protection.Engine Overspeed Protection
This machine is equipped with automatic engine overspeed protection. If the engine speed reaches 2475 rpm, the ARC system will automatically engage, regardless of the position of the ARC switch. To prevent further engine overspeed, the transmission will upshift one gear if the following conditions are met:
Engine speed reaches 2750 rpm
Transmission is in the same actual gear as the selected gear on the transmission controlRetarding Information and Operation
Selection of the proper gear is essential for effective operation of the retarder system. See the retarding film for retarding guidelines to select the proper gear.Select the proper gear on the transmission control before starting down a grade. The actual gear should also match the selected gear before starting down a grade. For more information on the transmission control, see Operation and Maintenance Manual.When the retarding film does not address the current conditions, use the following rule: The desired gear on a downgrade is the gear that is required to go up the grade when the machine is loaded.The ground speed must be slow enough for the conditions and at a rate that will not cause the brakes to overheat. Braking should be steady. Slow down the machine for better brake cooling. Do not travel at high ground speeds and do not stop in a short distance.Note: Engine speed must be at least 1700 rpm to circulate sufficient brake oil through the oil cooler. This oil keeps