CATERPILLAR GENERATOR SETS

FLYWHEEL BALANCE WEIGHTS (cont) - TM-55-1930-209-14P-9-4_151

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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FLYWHEEL BALANCE WEIGHTS TESTING AND ADJUSTING expected total concentric runout can be held to 0.002 in (0.05 mm). The extended shaft rotor should be dynamically balanced within the generator manufacturer's balance deviation limits while suspended by the rear bearing and extended shaft pilot diameter. With an extended piloted rotor shaft, the coupling plates must have clearance between the outside diameter of the plates and the flywheel coupling plate bore. Clearance is necessary or serious vibration may result. The coupling plates provided with a generator which does not have an extended shaft rotor pilot are usually of the close fitting piloting type. These cannot be used when the bolt-on shaft extension is used. CATERPILLAR GENERATOR SETS Caterpillar Generators are matched to the Caterpillar Engine for minimum vibration. The installation group includes proper coupling plates and, if necessary, balance weights correctly mounted on the engine. Current, price listed Caterpillar Generators should always be mounted with the price listed installation arrangement or coupling group for the engine. TESTING GENERATOR SET ENGINES Occasionally, a generator set engine is test run without the generator attached. If the engine is equipped with a balance weight on the flywheel (weight, bolt, washer or bolt and weight), the engine will vibrate. If an engine equipped with a flywheel balance weight is to be test run by itself (without the generator), the test should be performed without the flywheel balance weight assembly. Before the generator is mounted, be sure the proper weight assembly (bolt and weight or bolt, weight, and washer) is installed. Do not permit any substitution of balance weight parts (i.e., a longer or shorter bolt). Generator sets having piloted shaft generators may exhibit wear on the pilot shaft, wear in the flywheel bore, or both after extensive service. When the total clearance between these points exceeds 0.005 in (0.127 mm), the assembly alignment function of the piloted shaft is lost. Shaft extension diameter and flywheel pilot bore dimensions should be checked. Bore and shaft should be round within 0.001 in (0.025 mm). Wear generally occurs on only a small segment of surface in the bore and/or on the shaft diameter. During assembly, original alignment can frequently be reestablished by rotating the engine and generator to positions where the flywheel bore will support the rotor shaft on previously not worn surfaces. 110

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