ENGINE AR 4P6540 - Caterpillar

Probable Causes
Battery cables and/or batteries
Starting circuit
Internal engine problemRecommended Repairs
Battery Cables and/or Batteries
Inspect the main power switch, battery posts, and battery cables for loose connections and corrosion. If the battery cables are corroded, remove the battery cables and clean the battery cables. Clean the battery posts and then replace the cables. Tighten any loose connections.
Inspect the batteries.
Charge the batteries.
Load test the batteries. Refer to Systems Operation/Testing and Adjusting. Starting Circuit
Inspect the starting motor and the flywheel ring gear for damage. Test the operation of the starting motor and associated circuit components. Refer to Systems Operation/Testing and Adjusting. Internal Engine Problem
Remove the glow plugs. Refer to Disassembly and Assembly.
Attempt to rotate the crankshaft through 360 degrees in both direction. If the crankshaft rotates correctly but fluid is expelled from the hole for the glow plug, investigate the cause of the fluid in the cylinder. Refer to Systems Operation/Testing and Adjusting.
If the crankshaft rotates correctly and no fluid is expelled, install the glow plugs. Refer to Disassembly and Assembly.
If the engine does not rotate in Step 2, disassemble the engine. Refer to Disassembly and Assembly.
Inspect the internal components for the following conditions:
Seizure
Broken components
Bent components