Lubrication & Maintenance/500 Hour/12 Month Manual Belt Tensioner Adjustment Using Belt Tension Tool (Alternate Method For Engines Without Auxiliary Drive) NOTE: The JD1520 Belt Tension Tool may not be compatible with all alternators. In that case, use the preceding method for belt tensioning. RG11812 –UN–31OCT01 NOTE: Inspect belts for cracks, fraying, or stretched-out areas. Replace if necessary. As a reference check, twist belt in the middle of a 254—305 mm (10—12 in.) span with two fingers. A properly tensioned belt will turn 75—85 degrees. If belt turns more, it needs to be tightened. If belt turns less, it needs to be loosened. Alternator Bracket and Cap Screws 1.
Loosen upper (A) and lower (B) alternator bracket cap screws. Lower cap screw must remain tight enough to prevent excessive alternator play but allow alternator to pivot by hand. RG11813 –UN–31OCT01 2. Insert JDG1520 Belt Tension Tool (C) behind belt (D) and over alternator mounting screw. Belt Tension Tool A—Upper Alternator Bracket Cap Screw B—Lower Alternator Bracket Cap Screw C—JDG1520 Belt Tension Tool D—Belt Continued on next page OUOD002,000016D –19–05JUN02–1/2 30-5 021604 PN=142