FORK GP-PALLET 1263346 - Caterpillar

Problems, Causes and Corrections
Mat Finish Problems
Problems in obtaining the correct mat surface finish can be traced to several different sources.1. Improper mix control improper temperature control, unstable mix, improperly graded mix, etc.2. Improper rolling of the mat not enough, too much, too soon, too late, etc.3. Improper adjustment of the paver, too much lead crown, too little lead crown, vibrator speed wrong, etc.4. Improper operation of the paver, paving too fast, paving too slow, running paver out of material, etc.5. Improper preparation of the surface on which the mat is laid.The following troubleshooting procedures will help in locating the cause of mat defects and in correcting the cause.1. Mat Not Compacted Properly Cause: Vibrators running too slow. Correction: Increase vibrator speed. Cause: Screed not completely lowered. Correction: Lower screed. Cause: Mix graded improperly. Correction: Correct at plant. Cause: Poor mix temperature control. Correction: Correct at plant or trucks. Cause: Soft base. Correction: Check base before starting paving operation. Cause: Automatic feeder control not properly adjusted. Correction: Adjust position of feeder control sensor paddles.2. Screed Marks in Mat Cause: Brakes set on truck. Correction: Instruct truck driver. Cause: Truck bumping paver. Correction: Instruct truck driver. Cause: Automatic feeder control. Correction: Visually check operation of feeder control. Troubleshoot if necessary. Cause: Waiting a long time between loads. Correction: Correct at plant or trucks. Reduce paving speed.3. Wavy Surface (Long Waves) Cause: Over controlling of screed. Correction: Allow time for screed to react between adjustments. Cause: Poor mix temperature control. Correction: Correct at plant or trucks. Cause: Running material too low between loads. Correction: Reduce paving speed. Cause: Poor grade reference (using grade control). Correction: Improve or change reference. Cause: Screw conveyors loaded too high. Correction: Adjust automatic feeder control. Cause: Head of material fluctuating. Correction: Adjust automatic feeder control. Cause: Segregation of materials in mix. Correction: Correct at plant. Cause: Screw conveyor flighting worn. Correction: Replace flighting. Cause: Waiting a long time between loads. Correction: Correct at plant or trucks. Reduce paving speed.4. Wavy Surface (Short Waves) Cause: Screw conveyor loaded too high. Correction: Adjust automatic feeder control. Cause: Poor mix temperature control. Correction: Correct at plant or trucks. Cause: Over controlling screed. Correction: Allow time for screed to react between adjustments. Cause: Head of material fluctuating. Correction: Adjust automatic feeder control. Cause: Segregation of materials in mix. Correction: Correct at plant. Cause: Too much slack in roller drives. Correction: Repair/replace roller. Cause: Screw conveyor flighting worn. Correction: Replace flighting. Cause: Grade control sensor "hunting." Correction: Reduce sensor gain.5. Bad Longitudinal Joint Cause: Grade control sensor not properly positioned. Correction: Adjust sensor mount. Cause: Not rolling soon enough. Correction: Instruct roller operator. Cause: Over controlling screed. Correction: Allow time for screed to react between adjustments. Cause: Screw conveyor loaded too high. Correction: Adjust automatic feeder control. Cause: Poor mix temperature control. Correction: Correct at plant or trucks. Cause: Head of material fluctuating. Correction: Adjust automatic feeder control. Cause: Screed end gate not positioned properly. Correction: Adjust end gate. Cause: Too