Fig. Q.11. Internal Wiring Diagram.

ELECTRICAL EQUIPMENTQ.12 - TM-55-1930-209-14P-9-4_758

DISMANTLING THE STARTER - TM-55-1930-209-14P-9-4_760

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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ELECTRICAL EQUIPMENT—Q.13 Testing on the Application Ensure that the battery is in a charged condition. Switch on the lamps and operate the starter button. If the starter fails to function, but the lights maintain full brilliance, check the switch and battery connections to the starter and all external leads. Sluggish action of the starter can be caused by a poor or faulty connection. Difficulty in smooth engagement between starter and engine flywheel is probably due to dirt on the starter- shaft helices preventing free pinion movement. The shaft should be thoroughly cleaned with cleaning fluid followed by the application of a small quantity of Caltex Thuben 90 or SAE 90 oil. OPERATING THE STARTER When starting the engine the following points should be rigidly observed 1. Press the starter button firmly and release it immediately the engine fires. 2. If the engine does not fire at once, let it come to rest before pressing the switch again. 3. Do not run the battery down by keeping the starter switch pressed when the engine refuses to start. Ascertain the cause. 4. Do not operate the starter when the engine is running as serious damage may occur to both starter and flywheel. MAINTENANCE LUBRICATION The large oil reservoir in the drive end shield need only be replenished during overhaul periods, when a supply of BOLIVIO oil should be added through the oil plug (7). An oil impregnated sintered bronze bush is fitted at the commutator end, and needs no further attention. BRUSH GEAR AND COMMUTATOR Inspect the brushes at intervals of approximately 2.500 hours. See that they are free in their guides and that the leads are quite free for movement, by easing back the brush springs and pulling gently on the flexible connections. If a brush Fig. Q.11. Internal Wiring Diagram. is inclined to stick, remove it from its holder and clean the sides with a petrol moistened cloth. Be sure to refit the brushes in their original positions to retain the "bedding." The brushes should he well bedded (i.e. worn to the commutator periphery) but if not, wrap a strip of very fine glass or carborundum paper firmly around the commutator with the abrasive side outwards. With the brushes in position, rotate the armature by hand in the normal working direction of rotation; until the correct brush shape is obtained. If the brushes are worn down so that the springs are no longer providing effective pressure, they should be renewed. Check the brush spring pressure by hooking a spring balance under the spring lip. The correct tension is 30—40 ozf (0,9—1,1 kgf). It is essential that replacement brushes are the same grade as those originally fitted. Genuine spares should always be used. To remove the brushes, unscrew the four fixing screws. one to each brush. In re-assembling care must be taken to re-connect the field coil and interconnector leads, held by two of the fixing screws. Before inserting brushes in their holders, it is advisable to blow through the holders with compressed air or clean them with a cloth moistened with petrol.

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