CPO Hydraulic Systems & Pump Mechanics Flashcards
6 cards from real CPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CPO Hydraulic Systems & Pump Mechanics flashcards as text
What is the function of the S-tube valve (rock valve) in a concrete pump?
Answer: To direct concrete alternately from each cylinder into the delivery pipeline
The S-tube valve swings between the two pumping cylinders to direct concrete flow into the delivery pipeline during each alternating stroke.
What component prevents concrete from flowing backward in the delivery pipeline?
Answer: Check valve
Check valves allow flow in only one direction, preventing concrete from reversing back into the pump during each stroke transition.
What is the primary purpose of the agitator in the concrete pump hopper?
Answer: To keep concrete moving and prevent segregation of materials
The agitator continuously moves concrete in the hopper to prevent aggregate from settling and to maintain workability before pumping.
What type of pump is most commonly used in truck-mounted concrete boom pumps?
Answer: Twin-cylinder piston pump
Twin-cylinder piston pumps are standard in concrete boom pumps because they generate the high pressures needed and can handle abrasive concrete.
How does a concrete pump's stroke counter benefit the operator during a pour?
Answer: It tracks pumping strokes to estimate volume of concrete pumped
Since each stroke displaces a known volume, the stroke counter allows operators to estimate total volume pumped and monitor pump performance.
What is the primary function of the water pump on a concrete pump unit?
Answer: To prime the delivery line and flush the pipeline clean after pumping
The water pump primes the delivery pipeline with water or cement slurry before pumping concrete and flushes the line clean at job completion.