Liebherr Service Engineer Interview Questions and Answers

The speed difference in a hydraulic ram is due to the difference in effective areas on the head side and rod side.

• The head side of the ram has a larger effective area, resulting in slower speed.

• The rod side of the ram has a smaller effective area, resulting in faster speed.

• This speed difference is a result of the hydraulic pressure acting on different areas.

• The speed ratio between the head side and rod side can be calculated using the effective areas.

• Example: If the head side...read more

A pressure relief valve is used to protect equipment and systems from excessive pressure by releasing the pressure when it exceeds a certain limit.

• Prevents damage to equipment and systems

• Ensures safety of personnel

• Maintains system integrity

• Prevents explosions or ruptures

• Relieves excess pressure by opening and releasing fluid or gas

• Commonly used in boilers, pressure vessels, pipelines, and hydraulic systems

Open loop and closed loop are two modes of operation in hydraulic systems.

• Open loop operation: The hydraulic system operates without feedback control. The output is not adjusted based on the system's performance.

• Closed loop operation: The hydraulic system uses feedback control to adjust the output based on the system's performance.

• Open loop systems are simpler and less expensive, but they lack precision and accuracy.

• Closed loop systems are more complex and costly, but they of...read more

Tappet setting is the process of adjusting the clearance between the tappet and the valve stem in an engine.

• Tappet setting ensures proper valve timing and prevents engine damage.

• It involves adjusting the clearance between the tappet and the valve stem using a feeler gauge.

• The correct tappet setting varies depending on the engine model and manufacturer.

• Incorrect tappet setting can cause engine noise, poor performance, and even engine failure.

• Regular tappet setting maintenance ...read more

A hydraulic circuit is a system that uses pressurized fluid to transmit power.

• A hydraulic pump is used to create pressure in the fluid.

• Valves control the flow of fluid through the circuit.

• Actuators, such as cylinders or motors, convert the fluid pressure into mechanical force.

• A reservoir stores the fluid and a filter removes contaminants.

• Examples include excavators, cranes, and hydraulic presses.

My core values include integrity, accountability, and continuous learning.

• Integrity: I believe in always doing the right thing, even when no one is watching.

• Accountability: I take ownership of my actions and responsibilities.

• Continuous learning: I strive to constantly improve my skills and knowledge.

• Example: I once discovered a mistake in a project I was working on, and instead of ignoring it, I took responsibility and rectified the error.

• Example: I regularly attend workshops...read more

An orifice is a small opening or hole through which fluid or gas can flow.

• Orifices are commonly used in various industries, such as plumbing, engineering, and manufacturing.

• They are often used to control the flow rate of fluids or gases.

• Orifices can be found in devices like nozzles, valves, and flow meters.

• The size of an orifice determines the flow rate and pressure drop across it.

• Examples of orifices include the tiny hole in a spray bottle nozzle or the opening in a fuel inj...read more