190303d powershift control and shifting

Question 1

a leaking transmission clutch would cause a low pressure reading in the governor circuit? true or false

Answer 1

True

Question 2

What two things does an automatic transmission require to shift?

Answer 2

it needs to know ground speed and operator demand for power

Question 3

What 3 hydraulic circuits are common to transmission controls?

Answer 3

clutch application circuit, torque converter charging circuit and transmission lubrication circuit

Question 4

Why is it not a good idea to tow an automatic transmission, or powershift transmission>

Answer 4

the charge pump is not supplying lubrication to the transmission because the engine may not be running, so internal lack of lubrication could occur

Question 5

What are some things you can do to prevent damages to a transmission when towing?

Answer 5

tow with drive wheels off the ground, remove driveline, remove drive axles, or planetaries, or planetary driveshaft.

Question 6

What dangers could occur in removing a planetary or planetary driveshaft on a powershift or automatic transmission when towing?

Answer 6

the park brake could be attached to the drive removed, and it could roll away

Question 7

What would overfilling a transmission cause?

Answer 7

would cause clutch slippage as the components may be submerged and cause excessive friction and overheating

Question 8

What would underfilling a transmission cause?

Answer 8

would cause aeration of the charging pump, and cause a lack of lubrication

Question 9

What limits clutch application pressure? and what does the valve act as? and what is its normal condition?

Answer 9

Clutch application pressure regulator valve, acts as a priority valve, which is normally closed

Question 10

What does a priority valve do?

Answer 10

allows oil to travel to a more important function prior to be moved to another area (IE; supplying oil to brakes and steering before supplying oil to clutches)

Question 11

What is the difference between transmission oil and hydraulic oil

Answer 11

transmission oil is specially formulated to provide maximum life of the friction material

Question 12

What controls the torque converter oil on cold starts?

Answer 12

the torque converter inlet relief valve

Question 13

What controls the maximum pressure inside the torque converter? and what else does it do?

Answer 13

The torque converter outlet relief valve, and it also keeps oil in the converter when the engine is shut down off

Question 14

what component gets replaced after a torque converter failure?

Answer 14

the oil cooler