TM 55-1930-209-14&P-21NOTEBefore disassembling idler gear assembly, check gear, hub, and bearing assembly for anyperceptible wobble or shake when pressure is applied by firmly grasping rim of gear withboth hands and rocking. If gear is satisfactory, it will only be necessary to check pre-loadbefore installation.Component parts of idler gear bearing are mated; therefore, match-mark parts duringdisassembly so they can be reassembled in their original position.e.Remove crankshaft timing gear as follows:NOTECrankshaft gear can be inspected on crankshaft and should not be removed unlessreplacement is required or complete engine overhaul/crankshaft replacement is inprogress.(1)Remove retaining nut and rear oil seal sleeve if one is installed.(2)Use a three prong gear puller that can be aligned with holes in gear and pull crankshaft gear off shaft.6-29Gear train cleaning, inspection and repaira.Cleaning. Wash all parts with cleaning solvent and dry thoroughly.b.Inspection and Repair(1)Inspect bearings for excessive wear, pitting, scoring, or flat spots on roller or races.(2)Inspect idler gear.(a) Examine gear teeth and bearing for scoring, pitting, or wear. If gear teeth are worn or bearing isexcessively damaged, replace assembly or install a new bearing in gear.(b) Test pre-load (or axial load) of bushing after installation. It must sustain a 2000 lb load withoutpushing out of gear.NOTEBushing must not protrude beyond gear face.(3)Repair by replacement of defective parts.6-55
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
