Equipment Operation & Controls Flashcards

When operating a mini excavator on a slope, which direction should the heavy end of the machine (counterweight) face?

Answer: Away from the slope (uphill)

The counterweight should face uphill to lower the machine's center of gravity and reduce rollover risk on slopes.

What is the purpose of the auxiliary hydraulic circuit on a mini excavator?

Answer: To power attachments such as hydraulic breakers or augers

The auxiliary hydraulic circuit supplies pressurized oil to optional attachments like breakers, augers, and grapples.

During a 360° swing, an operator notices the upper structure slows unexpectedly. The most likely cause is:

Answer: Low hydraulic oil level

Low hydraulic oil reduces pressure and flow to the swing motor, causing sluggish or slowed rotation.

What does the boom priority function do when activated?

Answer: Gives the boom cylinder priority oil flow over other circuits during combined movements

Boom priority diverts additional hydraulic flow to the boom cylinder, improving lifting speed during combined arm/bucket operations.

An operator is working near an underground utility. Which control technique best limits dig depth accidentally?

Answer: Use short, controlled arm-in strokes with frequent visual checks

Short, deliberate arm strokes allow the operator to monitor depth incrementally and stop before reaching utility depth.

What is the effect of extending the arm (arm-out) while the bucket is loaded?

Answer: It increases the load moment and reduces lift capacity

Extending the arm moves the load farther from the machine's pivot, increasing the overturning moment and reducing safe lift capacity.

Which condition requires the operator to immediately stop and park the mini excavator?

Answer: A hydraulic oil temperature warning lamp illuminates on the dash

A hydraulic oil overheat warning indicates risk of seal damage and system failure, requiring immediate shutdown to cool the system.