(1) Possible causes:
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1) Battery.
2) Battery cable.
3) Starting circuit.
4) Starter solenoid.
5) Starter motor.
6) Flywheel ring gear.
7) Transmission.
8) Engine auxiliary equipment.
9) Hydraulic cylinder lock.
10) Internal engine problems.
(2) Recommended measures:
1) Battery and/or battery cable.
① Check the main power switch, battery terminals, and battery cable for loose connections and corrosion. If corrosion is found, remove and clean the battery cable. Tighten any loose connections.
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② Check the battery. Charge the battery. Test the battery load.
2) Starter solenoid or starting circuit.
① Check the operation of the starter solenoid.
② Check the machine wiring connected to the starter solenoid. 3) Starter Motor.
① Check the starter motor operation.
② Check the starter pinion and flywheel ring gear for damage.
4) Transmission or Engine Auxiliary Equipment.
① Ensure the free play in the transmission system.
② Ensure the timing pin is not left in the flywheel housing.
③ Remove and inspect any engine auxiliary equipment that could lock the engine. Engine auxiliary equipment that could lock the engine includes the hydraulic oil pump driven by the rear gear set, air compressor, power steering pump, and engine oil pump.
5) Hydraulic Cylinder Lockers. Check the fluid in the cylinders by removing each individual injector (hydraulic cylinder lockers). Note: Drain the fuel from the cylinder head. When removing individual injectors, fuel will flow from the cylinder head into the cylinder.
6) Internal Engine Problems.
① Disassemble the engine (refer to the disassembly/reassembly section).
② Inspect internal components for jammed, broken, or bent parts.
