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TECHNICAL INFORMATION BELT INSTALLATION AND TENSIONING OBJECTIVE: 6. First determine the proper deflection force to tension the belt. Deflection forces are given in the following tables. Goodyear PdTM timing belts must be installed and tensioned Deflection forces are also given on the output of the properly to ensure optimum performance. Sprocket alignment MaximizerTM computer drive analysis. must be preserved while tensioning the drive. a) If using a tension gauge, the deflection scale is calibrated Before beginning, inspect the belt for damage and verify that in inches of span length. Check the force required to the sprockets are properly mounted. Refer to sprocket and deflect the belt the proper amount. There is an O-ring to bushing manufacturer installation procedure. Belts should help record the force. If the measured force is less than the never be crimped or bent to a diameter less than the minimum required deflection force, lengthen the center distance. If sprocket diameter, approximately 2 inches for 8mm belts and the measured force is greater than the required deflection 5 inches for 14mm belts. force, shorten the center distance. See chart on page 82 for deflection values and tension gauges available. 1. Shorten the center distance or release the tensioning idler to install the belt. Do not pry the belt onto the sprocket. b) If using other means to apply force to the belt, adjust the center distance so that the belt is deflected 1/64 per inch 2. Place the belt on each sprocket and ensure proper engage- of span length when the proper force is applied. See ment between the sprocket and belt teeth. chart on page 82 regarding RSM2000 Belt Tension 3. Lengthen the center distance or adjust the tensioning idler Meter which calculates belt tension by measuring span to remove any belt slack. vibrations. 4. Using a tape measure, measure the span length of the drive. 7. After the belt is properly tensioned, lock down the center Refer to dimension "P" in the diagram below. The span distance adjustments and recheck the sprocket alignment. length can be calculated using the below formula. Recheck the belt tension, alignment, and capscrew torque 5. Place a straightedge or reference line across the top of the after eight hours of operation to ensure the drive has not belt. shifted. P. SPAN LENGTH D. DIAMETER (IN) F. FORCE (LBS) D. DIAMETER (IN) Q. DEFLECTION (IN) GENERAL C. CENTER DISTANCE (IN) F = Deflection Force q = Deflection, 1/64" per inch of span length C = Center Distance D = Large Sprocket Pitch Diameter d = Small Sprocket Pitch Diameter P = Span Length 81
Goodyear Rubber Products
