Usage:
AP-650B (9DN1-UP),
AP-1050B (6ZN1-UP),
AP-1000B (7HN1-UP),
BG-2455C (6TN1-UP),
BG-225C (5GN1-UP),
BG-245C (4XN1-UP),
BG-260C (8GN1-UP) ASPHALT PAVERS
Problem:
During manufacture of the Topcon slope control, the wrong time constants were inadvertently loaded into the slope control box. Suspect slope control boxes include serial numbers 2012-2031 and 2068-2467. This serial number is located on the side of the slope box. An indication of wrong time constants can cause hunting of the slope tow point cylinder.
Solution:
Suspect serial number can be checked using the following test procedure.
- 1. Install the control boxes and set the screed on the ground.
- 2. Turn the ignition switch ON and select the slope position of the control system and then select survey.
- 3. With the parking brake applied, start the engine, increase the engine RPM to maximum, turn the screed vibratory system ON, speed dial at one half, select PAVE position, and move the propel lever forward slowly.
- 4. Observe the slope readout. If it is fluctuating 2-3%, the slope time constants may be set improperly.
- 5. If the slope readout is only fluctuating 0.1-0.2%, the slope box is operating properly.
If the control system was purchased from Topcon, contact your local Topcon dealer for repairs.
If the system was purchased from Caterpillar, contact Caterpillar Paving Products, Paving Products Support Group at (612) 493-1379 for further information.
NOTE: The slope sensor supplied by Caterpillar Paving Products will be a used rebuilt control.
NOTE: Service letter in process. Please share this information with your TEPS Dealers.
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