PISTON 1590308 - Caterpillar

Probable Causes
Battery cables and batteries
Switches and/or circuit breakers
Safety interlock on the application
Starting motor solenoid or starting circuit
Starting motor and/or flywheel ring gear
Engine accessories and transmission
Hydraulic lockRecommended Repairs
Complete the procedure in the order in which the steps are listed.
Table 1
Troubleshooting Test Steps Values Results
1. Battery Cables and Batteries
A. Inspect the main power switch, battery posts, and battery cables for loose connections and for corrosion. If the battery cables are corroded, remove the battery cables and clean the battery cables. Tighten any loose connections.
B. Inspect the batteries.
C. Charge the batteries.
Test the batteries. Refer to Systems Operation, Testing and Adjusting, "Battery - Test ".
Batteries and cables
Result: The batteries and cables are not OK.
Repair: Make the necessary repairs.
Result: The batteries and cables are OK.
Proceed to Test Step 2.
2. Switches and/or Circuit Breakers
A. Check any switches and/or circuit breakers that may interfere with the engine cranking. Refer to the applications electrical schematic for additional information.
Switches and/or circuit breakers
Result: The switches and/or circuit breakers are not OK.
Repair: Make the necessary repairs.
Result: The switches and/or circuit breakers are OK.
Proceed to Test Step 3.
3. Safety Interlock on the Application
A. Check that any safety interlock features on the application are in the safe position. Refer to the OEM documentation for details of any safety interlocks on the application.
Safety interlocks
Result: A safety interlock is preventing the engine from starting.
Repair: Disengage the safety interlock if it is safe to do so. If necessary, repair the safety interlock.
Result: There are no safety interlocks preventing the engine from starting.
Proceed to Test Step 4.
4. Starting Motor Solenoid and Starting Circuit
A. Test the operation of the starting motor circuit. Refer to Systems Operation/Testing and Adjusting, "Electric Starting System - Test".
Starting motor solenoid and circuit
Result: The starting motor solenoid and circuit are not OK.
Repair: Make the necessary repairs.
Result: The starting motor solenoid and circuit are OK.
Proceed to Test Step 5.
5. Starting Motor and/or Flywheel Ring Gear
A. Test the operation of the starting motor.
B. Check the wiring for the starting motor. Refer to Systems Operation, Testing, and Adjusting, "Electric Starting System - Test".
C. Check the pinion clearance. Inspect the pinion and the flywheel ring gear for damage. Refer to Systems Operation/Testing and Adjusting, "Electrical System" for additional information.
Starter pinion and flywheel ring gear are OK
Result: The starter pinion and flywheel ring gear are not OK.
Repair: Make the necessary repairs.
Result: The starting motor and flywheel ring gear are OK.
Proceed to Test Step 6.
6. Engine Accessories and Transmission
A. Ensure free movement of the driveline.
B. Remove and inspect any engine accessories that may lock up the engine.
The following list contains examples of engine accessories that may lock up the engine:
Hydraulic pump that is driven from the rear gear group
Air compressor
Engine oil pump
Other components that are driven by the engine
Engine accessories and transmission
Result: The engine accessories and transmission are not OK.
Repair: Make the necessary repairs.
Result: The engine accessories and transmission are OK.
Proceed to Test Step 7.
7. Hydraulic Lock
Note: If an injector has been replaced, evacuate any fluids