Group 25 Tests Serpentine Belt Tension Check SERVICE EQUIPMENT AND TOOLS JDG529 Belt Tension Gauge MS12501,000002F –19–24APR06–1/2 TM2361 (24JUN08) 9010-25-1 450DLC Excavator Operation and Tests 062608 PN=297 SPECIFICATIONS Serpentine Belt Deflection 6-8 mm at 98 N .24-.32 in. at 22 lb-force 1. Check belt regularly for wear. Replace if necessary. 2. Check belt tension with belt deflection gauge at midway between tensioner pulley (6) and alternator pulley (3). Specification –UN–10JAN06 Serpentine Belt—Deflection.............................................. 6-8 mm at 98 N .24-.32 in. at 22 lb-force 3.
If deflection is not within specification, loosen alternator TX1002487 lock nut (1) and tensioner pulley lock nut (5). 4. Adjust tensioner pulley adjustment bolt (7) and alternator adjustment bolt (2) until belt tension is within specification. 1—Lock Nut (alternator) 5. Tighten alternator lock nut (1) and tensioner pulley lock 2—Adjustment Bolt (alternator) nut (5). 3—Alternator Pulley 4—Bolt (alternator) 5—Lock Nut (tensioner pulley) 6—Tensioner Pulley 7—Adjustment Bolt (tensioner pulley) MS12501,000002F –19–24APR06–2/2 9010 25 1