BEARING-ALIGNING 9M3914 - Caterpillar

Problem 1: Engine Crankshaft Will Not Turn When Ignition Switch Is On. Probable Cause(s):* Low Or No Battery Voltage* Defective Switch, Defective Wiring Or Connection In Switch Circuit* Defective Cable Or Connection (Battery To Starter)* Defective Starter Solenoid* Defective Starter Motor* Transmission Or Power Take-off Problems Prevents Crankshaft From Turning* Internal Problems Prevents Crankshaft From Turning1. Low or no battery voltage: Check battery voltage. If battery voltage is less than 8 volts for a 12 volt system, or 16 volts for a 24 volt system, put a charge on the battery. If battery will not hold a charge, load test the battery. Refer to Systems Operation, Testing & Adjusting, SENR1118.2. Defective switch, defective wiring or connection in switch circuit: With ignition switch in the "START" position, check voltage at switch connection on starter solenoid. If there is no voltage, or if the voltage is low at this connection and there is good voltage at the battery, check for a defective cable or connection between the battery and the starter.3. Defective cable or connection (battery to starter): With ignition switch in the "START" position, check voltage at connection of battery cable to starter. If there is no voltage, or if the voltage is low at this connection and there is good voltage at the battery, check for a defective cable or connection between the battery and the starter.4. Defective starter solenoid: Remove and repair or replace a solenoid which does not work when voltage is correct at both the battery and ignition switch connections.5. Defective starter motor: If the solenoid works and the starter motor does not turn the crankshaft, the starter motor is defective. Before removing the starter motor, turn the crankshaft by hand to be sure a mechanical failure inside the engine, transmission, or power take-off is not preventing the crankshaft from turning. If the crankshaft turns freely by hand, engage the starter motor again. If the starter motor still will not work, remove the starter motor. Repair or replace the starter motor.6. Transmission or power take-off (if equipped) problem prevents crankshaft from turning: If the crankshaft cannot be turned by hand, disconnect the transmission and the power take-off. If the crankshaft will now turn, find the cause of the problem in the transmission or power take-off and make necessary corrections.7. Internal problem prevents crankshaft from turning: If the crankshaft cannot be turned after disconnecting the transmission and/or the power take-off, remove the fuel injection nozzles and check for fluid in the cylinders while turning the crankshaft. If fluid in the cylinders is not the problem, the engine must be disassembled to check for other internal problems. Some of the possible problems are bearing seizure, piston seizure, and valves making contact with the pistons. Problem 2: Engine Hard To Or Will Not Start. Engine Crankshaft Turns Too Slowly. Probable Cause(s):* Low Battery Voltage* Defective Cable Or Connection (Battery To Starter)* Oil Too Thick For Free Crankshaft Rotation* Defective Starter Motor* Extra Outside Loads* Mechanical Problems Inside