TM 5-4240-5501-148PSTARTERSGear Drive 12VGEAR DRIVE STARTER MOTOR USED ON MODELS300400 and 320400This starter motor uses a gear type engagement method,similar to an automobile starter. When the starter motoris activated, the helix on the starter motor shaft drives apinion gear into engagement with a ring gear attached tothe engine flywheel and cranks the engine.Recommended battery sizes range from 32 ampere hourfor normal service to 50 ampere hour for -20° F service.CHECKING STARTER MOTOR DRIVEWhen the starter motor is activated, the pinion gearshould engage the flywheel ring gear and crank theengine. This action can be observed by removing theblower housing. If the starter motor drive does not reactproperly, inspect the helix and pinion gear for freeness ofoperation.If any sticking occurs, this must be corrected. Properoperation of the starter is dependent on the pinion freelymoving on the helix. See Fig.Fig. 123 - Checking Starter Motor DriveFig. 124 - Exploded View36
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