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STARTING MOTOR
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPAIR (cont) - TM-5-4210-220-12_542
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued (4) Reconnect batteries. (5) Press cab START button, with ignition ON.  Be sure main engine cranks at good speed and when button is released, starter motor disengages.  A distinct pull-in of the solenoid will be heard just prior to the motor starting. REPAIR NOTE Starting motor must be removed from truck prior to repair.  When repairing, only disassemble motor so far as is necessary to make repair or replace defective parts. (1) Check  armature  rotates  freely  by  prying  pinion  with  a  screwdriver.    If  the  armature  does  not  turn  freely, disassemble starter to find cause (see step 9 following).  Otherwise proceed with tests 2-8. (2) Connect starter motor to test gear as shown.  Be sure battery is fully charged. (3) Close switch and note the reading on the voltmeter, ammeter and rpm indicator.  At a voltage of between 10 and 13 volts, a healthy motor will have a current draw of between 140 - 215A at a speed of 4000 - 7000 rpm. (4) Low speed and high current indicates. (a) tight, dirty, or worn bearings (b) loose pole shoes (c) bent armature shaft (d) shorted armature (e) grounded armature or field (5) No speed and high current indicates: (a) direct ground in terminal or fields (b) seized bearings (6) No speed and no current draw indicates: (a) open field circuit (b) open armature coils (c) broken  brush  springs,  worn  brushes,  high  insulation  between  commutator  bars  or  other  causes preventing good contact between brushes and commutator 4-417

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