Equipment Operation & Controls Flashcards

When using a hydraulic breaker attachment, which throttle setting is recommended?

Answer: High idle (full throttle)

Hydraulic breakers require high hydraulic flow and pressure, which is only available at full engine throttle.

The left joystick on a standard ISO-pattern mini excavator controls which two functions?

Answer: Swing and arm (dipper)

In ISO control pattern, the left joystick controls upper structure swing (left/right) and arm in/out (forward/back).

What is the safest practice when traveling a mini excavator across a public road or job-site thoroughfare?

Answer: Orient the bucket low to the ground and use a spotter or flaggers

A low bucket position lowers the center of gravity and improves visibility, while spotters ensure pedestrian and traffic safety.

During trenching, the operator should periodically swing the bucket away from the trench and release soil because:

Answer: Accumulating soil near the trench edge increases surcharge load and collapse risk

Spoil placed too close to the trench edge adds surcharge weight that can cause cave-ins, so soil should be deposited at a safe distance.

What function does the auto-idle feature perform on a mini excavator?

Answer: Reduces engine RPM automatically after a set period of joystick inactivity

Auto-idle lowers engine speed when controls are not used for a preset time, saving fuel and reducing noise.

When picking up and carrying a load with a mini excavator, the arm should be:

Answer: Retracted (arm-in) to keep the load close to the machine

An arm-in (retracted) position minimizes the load moment arm, reducing tipping risk and maximizing safe lift capacity.

A mini excavator's dozer blade is primarily used for:

Answer: Backfilling trenches and leveling spoil material

The dozer blade is designed for pushing and leveling soil, sand, or spoil, and can also stabilize the machine on soft ground.