How to Start a Wyoming Coal Haul Truck

Starting a Wyoming coal haul truck requires a rigorous multi-step safety inspection and a specific sequence of mechanical activations. Operators must perform a complete pre-start walkaround, conduct in-cab diagnostic checks, and allow the diesel-electric engine to idle and build pneumatic pressure before movement.

Operating these massive machines is less like driving a standard vehicle and more like piloting an aircraft.

The pre-start inspection routine

Safety protocols dictate that an operator must first conduct a comprehensive walkaround of the vehicle. This includes maintaining three-point contact during the ascent and checking critical fluid levels, such as engine oil, coolant, hydraulic fluid, and transmission oil.

The inspection extends to the physical integrity of the machine’s foundation. Operators look for cuts or low pressure in the tires and inspect the undercarriage for embedded rocks, while also checking suspension struts, brakes, and the belly dump or box mechanism. A final clearance check ensures no personnel or obstacles are in the immediate path of the vehicle.

Once inside the cab, the focus shifts to internal safety systems.

Powering the diesel-electric drive

Starting the engine involves a specific diagnostic phase. Turning the ignition key to the “on” or “pre-lube” position allows the electronic control modules to run a diagnostic boot-up cycle. During this time, the operator must monitor the system for fault codes, low-pressure warnings, or other system alerts.

When the diagnostics are clear, the operator cranks the engine or presses the start button. This initiates the diesel engine, which in these specific models does not drive the wheels through a traditional mechanical transmission. Instead, the diesel engine produces electricity to power electric traction motors located on the wheels.

After the engine starts, the operator must let it idle to warm up.

Final movement signals

Before the truck can move toward the mine, two final checks are required to ensure the safety of the surrounding crew:

Systems Test: The operator must test the service brakes lightly and, if applicable, test the secondary steering system.
Audible Warning: Three blasts of the horn serve as a signal to all nearby personnel that the vehicle is beginning to move.