SECTION 4 OPERATING INSTRUCTIONS
4-14 DD-29/31HF/38HF Vibratory Asphalt Compactors
Using Vibration Controls: Operating the Machine Using Auto Vibration
NOTE: When Auto Vibration Mode is selected, vibration begins
automatically when the machine travel speed reaches approximately
½ mph.
1. Position the water spray switch (3, Figure 4-21) at the desired setting for
Manual, OFF, or Auto drum spray.
2. Press the right side of vibration switch (1, Figure 4-21) to select Auto Vibration.
3. Place the drum selector switch (2, Figure 4-21) to front drum vibration.
4. Move propulsion control (14, Figure 4-20) in the desired direction and safe
speed of travel as determined by the conditions.
Figure 4-21
5. Place engine throttle control (13, Figure 4-22) to the Hi (Up) position.
6. Adjust water spray flow control (12, Figure 4-22) for the desired amount of
spray on the drums.
Figure 4-22
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