Fig. Q.1. Lubricator in Commutator End Bracket.

Fig. Q.2. Dynamo Dismantled. - TM-55-1930-209-14P-9-4_752

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.5 DYNAMO 1. General The following information concerns the dynamo fitted as standard equipment to the earlier 4.236 marine engine, namely, the Lucas C40A model. If information concerning another type of dynamo is required, the relevant manufacturer should be contacted. The C40A is a non-ventilated, shunt-wound two-pole two-brush machine arranged to work in conjunction with a compensated voltage control regulator unit. A hall bearing supports the armature at the driving end and a porous bronze bush at the rear supports the commutator end. The output of the dynamo is controlled by the regulator unit and is dependent on the state of charge of the battery and the loading of the electrical equipment in use. When the battery is in a low state of charge, the dynamo gives a high output, whereas if the battery is fully charged, the dynamo gives only sufficient output to keep the battery in good condition without any possibility of overcharging. An increase in output is given to balance the current taken by lamps and other accessories when in use. When fitting a new control box, it is important to use only an authorized replacement. An incorrect replacement can result in damage to the dynamo. 2. Routine Maintenance (a) Lubrication Every 250 running hours, inject a few drops of high quality S.A.E. 30 engine oil into the hole marked "OIL" at the commutator end bearing housing. (b) Inspection of Brushgear Every 2,500 running hours, the dynamo should be removed from the engine and the brushgear inspected by a competent electrician. (c) Belt Adjustment Occasionally inspect the dynamo driving belt, and if necessary, adjust to take up any slackness by turning the dynamo on its Fig. Q.1. Lubricator in Commutator End Bracket. mounting. Care should be taken to avoid overtightening the belt (see Page M.1). 3. Performance Data The cutting in and maximum output speeds quoted below are production test figures and refer to cold machines with brushes only partly bedded. Model C40A Cutting-in Speed 1,100 rev/min (max.) at 13.0 dynamo volts. Maximum Output: 11 amperes at 1,700 rev/min (max.) at 13.5 dynamo volts and a resistance load of 1.23 ohms. Field Resistance: 6.0 ohms. 4. Servicing (a) Testing in Position to Locate Fault in Charging Circuit 1. Inspect the driving belt and adjust if necessary.

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