Exam 8: Hydraulic Fundamentals

Technician A says spool valves have lands and valleys that are used to block or allow the flow of transmission fluid. Technician B says an automatic transmission uses spool valves, solenoids, and check valves to direct fluid flow. Who is correct?

Which of the following is most likely to be caused by too cold of a temperature in the transmission fluid?

Technician A says that increasing the transmission fluid level from the add mark to the full mark will require a quart of fluid, just like with engine oil. Technician B says says that increasing the transmission fluid level from the add mark to the full mark will require a pint of fluid. Who is correct?

Two-way check valves commonly use a check ball design.

Technician A says accumulators are devices that cushion and absorb application pressure within the transmission. Technician B says accumulators are composed of a spring-loaded piston within a bore. Who is correct?

Technician A says other transmission pressure-regulating valves are similar to the main line pressure regulation valves, except these valves reduce line pressure to create a new pressure that varies with vehicle operation. Technician B says shift valves are spool valves that direct the flow of hydraulic oil to a clutch or band. Which technician is correct?

Pressurized fluid enters the accumulator, pushing the piston and compressing the accumulator spring. Once the piston is seated against the bottom of the accumulator bore, the clutch or brake being applied receives full line pressure.

Technician A says that line pressure is reduced during light throttle conditions to improve fuel economy. Technician B says that as the engine speeds up in rpm, the transmission line pressure gradually reduces to maintain clutch pack pressure. Who is correct?

The majority of automatic transmission spool valves are located outside the valve body.

Which of these is often used in conjunction with check balls and spool valves to restrict fluid flow for timing purposes?

Technician A says spool valves have lands and valleys that are used to block or allow the flow of transmission fluid. Technician B says an automatic transmission uses spool valves, solenoids, and check valves to direct fluid flow. Who is correct?

Technician A says that band and clutch application charts can help to diagnose faults in transmissions. Technician B says that 100 psi of pressure on a 2-square-inch piston results in 50 lb of force. Who is correct?

Which position should the manual valve be in to check the fluid level?