C7 Engine for AP-1000D, AP-1055D, BG-2455D, and BG-260D Asphalt Pavers Caterpillar

Probable Causes

• Engine shutdown switch

• Battery cables

• Batteries

• Starting circuit

• Starting motor solenoid

• Starting motor

• Flywheel ring gear

• Driven equipment

• Engine accessories

• Hydraulic cylinder lock

• Internal engine problem

Recommended Actions

Engine Shutdown Switch

Verify that the engine shutdown switch is in the OFF position. If the switch is in the ON position, fuel injection is disabled. Some engine shutdown devices will prevent the engine from being cranked.

Battery Cables and/or Batteries

1. Inspect the battery disconnect switch, bus bars, 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. Tighten any loose connections.

2. Inspect the batteries.

   1. Charge the batteries. Refer to Special Instruction, SEHS7633, "Battery Test Procedure".

   2. Load test the batteries. Refer to Special Instruction, SEHS9249, "Use of 4C-4911 Battery Load Tester for 6, 8 and 12 Volt Lead Acid Batteries".

Starting Motor Solenoid and/or Starting Circuit

1. Test the operation of the starting motor solenoid.

2. Check the wiring to the starting motor solenoid.

Starting Motor and/or Flywheel Ring Gear

1. Test the operation of the starting motor.

2. Inspect the starter pinion and the flywheel ring gear for damage. Ensure that the pinion gear does not bind with the flywheel ring gear during starting.

Driven Equipment and/or Engine Accessories

1. Ensure free movement of the driveline.

2. Ensure that the timing pin was not left in the flywheel housing.

3. Remove any engine accessories that may lock up the engine. Inspect the condition of the accessories.

   The following list illustrates examples of engine accessories that may lock up the engine:

   • Fuel transfer pump

   • Air compressor

   • Engine oil pump

Hydraulic Cylinder Lock

Check for fluid in the cylinders (hydraulic cylinder lock) by removing the individual unit injectors.

Note: Be sure to drain the fuel from the cylinder head prior to removing the injectors. Fuel will flow from the cylinder head into the cylinders when the unit injector is removed.

Internal Engine Problem

1. Inspect the internal components for the following conditions:
   • Seizure

   • Broken components

   • Bent components