CPO CPO Hydraulic Systems & Controls 2

Question 1

What type of hydraulic fluid is most commonly specified for concrete pump systems?

Accepted Answer

Anti-wear hydraulic oil (AW-46)

Answer

Motor oil SAE 30

Answer

Brake fluid DOT 4

Answer

Gear oil GL-5

Question 2

A sudden loss of boom movement during operation most likely indicates:

Accepted Answer

Hydraulic pump failure or loss of hydraulic pressure

Answer

Engine overspeed

Answer

Excessive concrete weight in the hopper

Answer

Outrigger float failure

Question 3

What is the function of a hydraulic accumulator on a concrete pump?

Accepted Answer

To store and release hydraulic energy to dampen pressure spikes

Answer

To clean hydraulic fluid

Answer

To generate additional engine torque

Answer

To control outrigger extension speed

Question 4

What should an operator do immediately upon noticing a hydraulic hose leak under pressure?

Accepted Answer

Shut down the pump and depressurize the system before inspection

Answer

Continue pumping and flag the leak for later repair

Answer

Apply tape to the hose while the system is running

Answer

Increase engine RPM to compensate for pressure loss

Question 5

Which hydraulic system component filters contaminants from the fluid?

Accepted Answer

Hydraulic filter/strainer

Answer

Hydraulic accumulator

Answer

Flow divider

Answer

Directional control valve

Question 6

What does a directional control valve do in a concrete pump's hydraulic circuit?

Accepted Answer

Routes pressurized fluid to the correct actuator to control movement direction

Answer

Regulates the maximum system pressure

Answer

Converts hydraulic pressure back to mechanical energy

Answer

Measures the flow rate of hydraulic fluid