OMRG25204 oem uncert & tier 1.pdf - John Deere Industrial Engines

Lubrication & Maintenance/500 Hour/12 MonthChecking Tensioner Spring TensionA belt tension gauge will not give an accurate measure ofthe belt tension when automatic spring tensioner is used.Measure tensioner spring tension using a torque wrenchand procedure outlined below:NOTE: Later engines have a 12.7 mm (1/2 in.) squaredrive hole in tensioner, so no socket drive isrequired.1. Release tension on belt using a breaker bar andsocket (if required) on tension arm. Remove belt frompulleys.Marks on TensionerRG7977 –UN–14NOV972. Release tension on tension arm and remove breakerbar.3. Put a mark (A) on swing arm of tensioner as shown.4. Measure 21 mm (0.83 in.) from (A) and put a mark (B)on tensioner mounting base.5. Install torque wrench (C) so that it is aligned withcenter of pulley and tensioner. Rotate the swing armwith the torque wrench until marks (A and B) arealigned.Align MarksRG12054 –UN–08JAN026. Record torque wrench measurement and compare withspecification below. Replace tensioner assembly asrequired.SpecificationSpring Tension—Torque ....................................... 18-22 N•m (13-16 lb-ft)NOTE: Threads on earlier belt tensioner roller cap screware LEFT-HAND threads.Align Torque Wrench With Pulley And TensionerRG12065 –UN–28JAN02A—Mark On Swing ArmB—Mark On Tensioner Mounting BaseC—Torque WrenchOURGP12,000004A–19–28JUL04–3/335-8 110306PN=88