TM 5-4240-501-14&PSTARTERS- Briggs & StrattonGear Drive 12V & 120VMark the center of the rivets holding the ring gear toflywheel, with a center punch. Drill out the rivets using a3/16" (4.8 mm) drill. Clean holes after drilling. Fig. 83.Attach new gear to flywheel using four screws and locknuts provided with gear.CHECKING STARTER MOTORSIf a starting problem is encountered, check the enginethoroughly to be sure it is not the cause of startingdifficulty. It is a good practice to remove the spark plugand rotate the crankshaft by hand, to be sure it rotatesfreely. Any belt, clutch or other parasitic load will affectcranking performance.Service procedures for both the 12 volt and 120 voltstarter motors are similar and will be covered together,except where noted otherwise.A list is provided to aid in diagnosing problems for 120volt DC and 120 volt AC systems. See page 9 and 10.Fig. 84 - 12 Volt & 120 Volt Starter Motor -Exploded ViewCHECKING STARTER MOTOR DRIVEWhen the starter motor is activated, the pinion gearshould rise, engaging the flywheel ring gear and crankthe engine. This action can be observed by removingthe starter shield. If the starter motor drive does notreact properly, inspect the helix and pinion gear forfreeness of operation. If any sticking occurs, this mustbe corrected. Proper operation of the starter isdependent on the pinion freely moving on the helix. SeeFig. 85.Fig. 85 - Checking Starter Motor DriveDISASSEMBLING STARTER MOTOR DRIVETo remove the drive assembly for cleaning orreplacement, disconnect and remove starter fromengine. Place in "V" block as shown in Fig. 87. Drivethe roll pin out with a hammer and 1/8" (3.2 mm)diameter punch to remove the retainer.NOTE: Some starter drive assemblies utilize a gearreturn spring. These are protected with a plastic capover the drive assembly. Carefully snap the plastic capfrom the cup using two screwdrivers. See Fig. 86.Fig. 86 - Removing Cap Assembly (Some Models)24
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