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Komatsu HM300/400 Pre-Operation Guide
This guide covers the essential steps for conducting a pre-operation inspection on Komatsu HM300 and HM400-3/Dash 5 articulated haul trucks. Follow these steps to ensure your machine is free from damage, wear, and leaks, maximizing its longevity and productivity.
This guide covers the essential steps for conducting a pre-operation inspection on Komatsu HM300 and HM400-3/Dash 5 articulated haul trucks. Follow these steps to ensure your machine is free from damage, wear, and leaks, maximizing its longevity and productivity.
1

Approach the Machine

Ensure Safety Before Inspection

  • Ensure there is no one in the cab.
  • Confirm the machine is securely chocked against movement.
2

Battery Check

Inspect the Batteries

  • Check that batteries are securely in place.
  • Ensure connection points have no excessive corrosion.
  • Locate breakers and the main battery disconnect switch.
3

Wheel and Fluid Check

Inspect Wheels and Fluids

  • Inspect tires and wheels for damage.
  • Check wheel hardware to ensure all lugs are tight.
  • Verify hydraulic fluid levels using the sight glass.
4

Rear Cab Inspection

Inspect Rear Cab Area

  • Start at the top and work down.
  • Check the guarding, brackets, and bolts.
  • Inspect hydraulic lines for leaks.
  • Check cylinder and articulation joint pins and lubrication.
  • Look under the machine for leaks.
  • Check transmission and brake fluid levels and fill spots.
5

Lift Cylinder and Brake Housing

Inspect Lift Cylinder and Brake Housing

  • Inspect lift cylinder mounting spot and hydraulic lines.
  • Check brake housing for leaks.
6

Mud Flap and Bed Shims

Inspect Mud Flap and Bed Shims

  • Check mud flap condition.
  • Ensure bed shims are in place.
7

Tailgate and Wheel Inspection

Inspect Tailgate and Wheels

  • Inspect tailgate hardware if equipped.
  • Perform the same wheel inspection as before.
8

Rear Machine Inspection

Inspect Rear of Machine

  • Check underside of the bed for material buildup.
  • Inspect bed hinge pins, lights, and rearview camera.
  • Check wheels, axle, and cylinders for leaks.
  • Inspect linkage for any issues.
9

Right Side Inspection

Inspect Right Side of Machine

  • Perform the same inspection as the left side.
  • Check handrails and mounting points on the cab.
10

Fuel and DEF Tank

Inspect Fuel and DEF Tank

  • Locate fuel fill spot for ultra-low sulfur diesel.
  • Check DEF tank (blue cap) and sight tube for DEF levels.
  • Inspect sediment drain for the fuel tank.
11

Front Machine Inspection

Inspect Front of Machine

  • Inspect mirrors and handrails on the right side of the cab.
  • Check air filter latches and air restriction gauge.
  • Inspect lights, handrails, mirrors, and radiators.
  • Look underneath the front for leaks.
12

Cab and Engine Inspection

Inspect Cab and Engine

  • Check handrails and mounting spots.
  • Use proper mounting and dismounting techniques.
  • Open the hood for engine inspection.
13

Engine Check

Perform Engine Inspection

  • Perform a visual inspection of the engine for leaks or debris.
  • Check windshield wiper fluid and engine coolant levels.
  • Inspect fuel pre-filter for contamination.
  • Locate and check the engine oil dipstick.
  • Inspect fan and belts for wear or damage.
14

Final Steps

Complete Final Inspections

  • Close the hood.
  • Check the hydraulic fill spot.
  • Inspect the exterior cab filter.
15

Ready for Operation

Enter the Cab and Operate

  • If all inspections are satisfactory, enter the cab and operate the machine.