Use the retarder in order to regulate the speed of the machine.
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| Illustration 1 | g01131558 |
The retarder control is located to the right side of the steering column. The retarder control has four positions:
DISENGAGED - Move the retarder control to position (1). This will disengage the retarder.
MINIMUM - Pull the retarder control to position (2) in order to obtain minimum retarder engagement.
MEDIUM - Pull the retarder control to position (3) in order to obtain medium retarder engagement.
MAXIMUM - Pull the retarder control to position (4) in order to obtain maximum retarder engagement.
If the retarder control is in the MINIMUM position, the MEDIUM position or the MAXIMUM position the retarder will engage when the accelerator control is released. The retarder will disengage when the accelerator control is pressed.
The retarder indicator will be illuminated when the retarder is engaged.
The effectiveness of retardation depends on the load in the body, the grade of the slope, and the gear which is selected. The most effective retardation occurs at an engine speed of 2000±100 rpm.
Monitor the transmission oil temperature while the retarder is engaged. Overheating of the transmission oil can result from extended use of the retarder. If the transmission oil becomes overheated during retarding, use the service brakes to slow the machine until a lower gear is selected. Do not apply the service brakes continually on grades.
If the transmission speed is within 50 rpm of making an upshift, a Warning Category 2 from the Caterpillar Monitoring System will be given.
Refer to Operation and Maintenance Manual, "Monitoring System".
The retarder is less effective after an upshift. To prevent an upshift, increase the amount of retarder engagement. If the retarder is already at maximum engagement, use the service brakes to slow the machine until the transmission downshifts to a lower gear. Do not apply the service brakes continually on grades.