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

AW-46 anti-wear hydraulic oil is the most common specification for concrete pump hydraulic systems due to its viscosity and additive package.

Question 2

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

Accepted Answer

Hydraulic pump failure or loss of hydraulic pressure

Answer

Sudden loss of boom movement typically points to hydraulic pump failure, a burst hose, or a rapid pressure drop in the system.

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

A hydraulic accumulator stores pressurized fluid and releases it to smooth out pressure fluctuations and assist during peak demand.

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

A pressurized hydraulic leak is extremely dangerous; the operator must immediately shut down and depressurize before any inspection.

Question 5

Which hydraulic system component filters contaminants from the fluid?

Accepted Answer

Hydraulic filter/strainer

Answer

Hydraulic filters and strainers remove particulate contamination from the fluid, protecting pumps, valves, and cylinders from wear.

CPO - Concrete Pump Operator Certification Practice Test