Hydraulic & Transmission Service Flashcards
7 cards from real CFA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Hydraulic & Transmission Service flashcards as text
What is the function of a hydraulic flow control valve in a forklift's lowering circuit?
Answer: To regulate the descent speed of the forks regardless of load weight
A flow control valve meters the fluid leaving the lift cylinder during lowering, maintaining a controlled descent speed whether the load is heavy or light.
Hydraulic hoses on a forklift should be inspected for all of the following EXCEPT:
Answer: Color fading due to UV exposure over time
While hose condition is critical, color fading from UV exposure alone is cosmetic and not a safety defect; structural damage and fitting integrity are the key inspection points.
In a hydrostatic transmission forklift, what controls travel speed and direction?
Answer: Variable displacement hydraulic pump and motor
Hydrostatic transmissions use a variable displacement pump to control both speed and direction by varying fluid flow and direction to the hydraulic drive motor.
What is the most common cause of hydraulic cylinder drift (slow unintended lowering of the load)?
Answer: Worn or damaged cylinder piston seals
Worn piston seals allow hydraulic fluid to bypass the piston, causing the cylinder to slowly retract under load even when the control valve is in neutral.
A forklift's transmission fluid should be changed at intervals specified in the:
Answer: Manufacturer's service and maintenance manual
Transmission fluid change intervals are specified by the forklift manufacturer in the service manual and vary by model, application, and operating conditions.
Which condition would cause hydraulic fluid to overheat during normal operation?
Answer: A clogged hydraulic filter restricting fluid flow
A clogged filter creates excessive flow restriction, causing the pump to work harder and generating heat as fluid is forced through the blockage.
What is the purpose of the hydraulic system's breather cap on the reservoir?
Answer: To allow air exchange while preventing contamination from entering
The breather cap allows the reservoir to breathe as fluid levels change while its filter prevents dirt and moisture from contaminating the hydraulic fluid.