CFA Hydraulic & Transmission Service 2 — Questions and Answers
Question 1: What does a sudden drop in hydraulic lift speed typically indicate?
- Low hydraulic fluid level or a worn pump (Correct answer)
- The load is too light for the system
- The mast chains need lubrication
- The parking brake is engaged
Correct answer: Low hydraulic fluid level or a worn pump
A sudden drop in lift speed usually points to low hydraulic fluid or a worn/failing hydraulic pump unable to maintain pressure.
Question 2: Which hydraulic component controls the direction of fluid flow to the lift and tilt cylinders?
- Hydraulic pump
- Control valve (Correct answer)
- Hydraulic reservoir
- Relief valve
Correct answer: Control valve
The control valve directs hydraulic fluid to the appropriate cylinder based on operator input from the lift, tilt, and attachment levers.
Question 3: What is the purpose of a hydraulic system relief valve?
- To drain excess fluid back to the reservoir during normal operation
- To limit maximum system pressure and prevent component damage (Correct answer)
- To filter contaminants from the hydraulic fluid
- To regulate fluid temperature
Correct answer: To limit maximum system pressure and prevent component damage
The relief valve opens when system pressure exceeds a set limit, bypassing fluid back to the tank to protect hoses, cylinders, and the pump.
Question 4: A forklift's hydraulic fluid appears milky or frothy. What is the most likely cause?
- Fluid overheating from heavy use
- Water contamination in the hydraulic system (Correct answer)
- Air trapped in the hydraulic lines
- Normal aging of the hydraulic fluid
Correct answer: Water contamination in the hydraulic system
A milky or frothy appearance in hydraulic fluid indicates water contamination, often from a failed seal, condensation, or improper fluid mixing.
Question 5: When checking hydraulic fluid level on a sit-down counterbalanced forklift, the mast should be:
- Tilted forward with forks raised to maximum height
- Vertical with forks lowered to the ground (Correct answer)
- Tilted back with forks at travel height
- At any position since fluid level doesn't change
Correct answer: Vertical with forks lowered to the ground
Hydraulic fluid level must be checked with the mast vertical and forks fully lowered so fluid is properly distributed in the system.
Question 6: What type of transmission is most common on internal combustion engine forklifts?
- Manual clutch with synchromesh gears
- Hydrostatic transmission
- Torque converter automatic transmission (Correct answer)
- CVT (continuously variable transmission)
Correct answer: Torque converter automatic transmission
Most IC engine forklifts use a torque converter automatic transmission, which provides smooth power transfer and eliminates the need for manual clutch operation.
Question 7: Which symptom most likely indicates a slipping transmission clutch pack in an automatic forklift transmission?
- Engine races but the forklift moves slowly or hesitates (Correct answer)
- Hydraulic lift speed is reduced
- The forklift pulls to one side when traveling
- Excessive steering effort is required
Correct answer: Engine races but the forklift moves slowly or hesitates
A slipping clutch pack causes the engine RPM to rise without a corresponding increase in travel speed, as the clutch fails to fully engage.
CFA Hydraulic & Transmission Service 2
What does a sudden drop in hydraulic lift speed typically indicate?