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| Illustration 1 | g00316186 |
Note: This can be seen on a truck that is equipped with the Electronic Monitoring System (EMS).
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| Illustration 2 | g00316163 |
Note: This can be seen on a truck that is equipped with the Vital Information Management System (VIMS).
Ground Speed
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| Illustration 3 | g00316129 |
Note: This can be seen on a truck that is equipped with the Electronic Monitoring System (EMS).
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| Illustration 4 | g00285157 |
Note: This can be seen on a truck that is equipped with the Vital Information Management System (VIMS).
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 stop in a short distance.
Engine Speed
| NOTICE |
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Engine overspeed can cause serious damage. Keep the tachometer indicator in the green operating range. |
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| Illustration 5 | g00316130 |
Note: This can be seen on a truck that is equipped with the Electronic Monitoring System (EMS).
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| Illustration 6 | g00285163 |
Note: This can be seen on a truck that is equipped with the Vital Information Management System (VIMS).
Engine speed must be at least 1700 rpm in order to circulate sufficient brake cooling oil through the oil cooler. This will keep the disc brakes cool.
Brake Oil Temperature and Torque Converter Oil Temperature
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| Illustration 7 | g00316131 |
Note: This can be seen on a truck that is equipped with the Electronic Monitoring System (EMS).
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| Illustration 8 | g00285164 |
Note: This can be seen on a truck that is equipped with the Vital Information Management System (VIMS).
Frequently observe the oil temperature gauge.
If the indicator exits the crosshatched zone, the oil cooler capacity has been exceeded. Stop the machine. Operate the engine at moderate speed until the oil cools. Then, proceed at a slower speed in a lower gear.
Downgrade Retarding
Never coast down a grade in neutral. Always keep the transmission in gear. The Electronic Programmable Transmission Control (EPTC II) will prevent shifting from forward gear to neutral at ground speeds that are greater than 5 km/h (3 mph). Also, the EPTC II will prevent shifting from forward gear to reverse gear at ground speeds that are greater than 5 km/h (3 mph) .
Attempting to prevent upshifting on a long downgrade by retarding can be unsuccessful. The transmission direction and speed control lever should be in the desired gear before you start the downgrade. The transmission should also be in the desired gear before you start the downgrade. If you rely on retarding, engine speed may reach the upshift point. The lower engine speed would reduce brake cooling oil flow. This can cause overheating of the brakes.
When the service brake or the retarder is applied, the transmission upshift point is raised to a higher rpm than a normal shift point.
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| Illustration 9 | g00416838 |
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| Illustration 10 | g00284754 |
If you experience undesired shifting, move the transmission direction and speed control lever to the proper gear.
If the machine gains excessive speed during retarding, the engine can overspeed. Use the manual retarder lever in order to reduce the machine speed. If additional braking is needed, hold down the secondary brake lever. This adds more brake force.
Travel at the best average speed. Do not speed up and brake. Do not try to do all the braking at the bottom of a hill. Keep braking steady and keep the ground speed under control.
Move the transmission direction and speed control lever higher by one gear. This will reduce engine overspeed until the machine slows. Then, return the transmission direction and speed control lever to the original position.
For efficient retarding at constant rpm, use the Automatic Retarder Control.