Drive Line Systems Flashcards
The following measurements have been taken on a 3/4 ton truck with a two-piece driveshaft. What symptoms will be caused by these conditions?
Transmission angle 2 degrees down from horizontal
Front driveshaft angle 2.5 degrees down from horizontal
Rear driveshaft angle 5 degrees down from horizontal
Rear axle housing angle 5 degrees down from horizontal
a. The front u-joint will be tight; causing clicking.
b. The rear u-joint will cause a vibration.
c. The steady bearing will be loaded; causing premature wear.
d. The joints are all within specified operating angles and will perform as expected.
b. The rear u-joint will cause a vibration.
A customer complains of a squeaking noise as the vehicle starts to move. The noise increases frequency about three times faster than the vehicle speed increases. What problem is indicated by this symptom?
a. A worn CV joint
b. An out of phase driveshaft
c. A dry Cardan u-joint
d. A worn steady bearing
c. A dry Cardan u-joint
A manual transmission is noisy under load in all reduction gears. What is the problem?
a. First speed output gear teeth chipped
b. Clutch shaft pilot bearing is worn
c. Cluster shaft bearings damaged
d. Speedometer drive gear chipped
c. Cluster shaft bearings damaged
How is a forward gear reduction obtained from a simple planetary gear set?
a. The sun gear must be held.
b. The carrier assembly must be the input member.
c. The ring (annulus) gear must be held.
d. the carrier assembly must be the output member
d. The carrier assembly must be the output member.
If a multiple-disc holding clutch in an automatic transmission fails, which of the following statements is true?
a. One member of a planetary gear set will not lock to the output shaft.
b. The input shaft will not lock to the torque converter.
c. One member of a planetary gear set will not lock to the transmission case.
d. The output shaft will not lock to the transmission case.
c. One member of a planetary gear set will not lock to the transmission case.
An automatic transmission has no reverse and no engine braking in manual first gear range. What is the cause of the problem?
a. The over-running clutch has failed.
b. The forward clutch has burned out.
c. The rear band has broken.
d. The direct clutch is slipping.
c. The rear band has broken.
A shift valve in a hydraulically operated automatic transmission fails to open. What is causing this problem?
a. Throttle pressure is greater than governor pressure and spring force combined.
b. Governor pressure is greater than throttle pressure and spring force combined.
c. Mainline pressure has reached or exceeded maximum value.
d. The torque converter has locked up prematurely.
b. Governor pressure is greater than throttle pressure and spring force combined.
A torque converter will not cause torque multiplication. What is the problem?
a. The stator is not locking to redirect fluid to the impeller.
b. The stator is locking and redirecting fluid to the impeller.
c. The impeller is being driven at engine speed.
d. The impeller and turbine are being driven at the same speed.
a. The stator is not locking to redirect fluid to the impeller.
180 lb-ft is the input at a transfer case input shaft. In low range (1.8:1) ratio, how much torque is delivered to the drive pinion of the front axle of a four wheel drive vehicle?
a. 50 lb-ft
b. 100 lb-ft
c. 162 lb-ft
d. 324 lb-ft
c. 162 lb-ft? … not d. 324lb-ft
A tech is replacing the universal joints in a two-piece driveshaft. What is the correct procedure for replacing the centre joint?
a. Remove the retaining clips, place the companion flange on the vice, then drive the cups out with a hammer by hitting the opposite cup.
b. Remove the retaining clips, then push the cups out using a ball joint press.
c. Cut the yoke to remove the existing u-joints, then press in the cups on the new joint using the vice.
d. Align the two halves of the shaft and index, then remove the joint and install the new one using a press.
b. Remove the retaining clips, then push the cups out using a ball joint press.
A vehicle equipped with an automatic transaxle is not shifting correctly. What is the first diagnostic step?
a. Adjust all the bands to specification.
b. Perform a hydraulic pressure test.
c. Inspect and adjust all linkages.
d. Check the fluid level and type.
d. Check the fluid level and type.
An electronically controlled automatic transaxle will not upshift to drive second. What should the tech do to repair this problem?
a. Replace the torque converter assembly.
b. Remove the transmission and check for burnt or damaged clutch packs.
c. Remove the valve body and repair the 1-2 shift valve assembly.
d. Follow the correct diagnostic procedure using hydraulic diagrams.
d. Follow the correct diagnostic procedure using hydraulic diagrams.
What test procedures should be followed before deciding that an automatic transmission needs a major overhaul?
a. Change the transmission fluid and filter, stall test, and then pressure test.
b. Stall test, pressure test, and then adjust the bands and pressures.
c. Check fluid levels, pressure test, and then inspect pan deposits.
d. Check fluid levels, inspect pan deposits, and then pressure test.
c. Check fluid levels, pressure test, and then inspect pan deposits.
Which statement is true when repairing automatic transmissions?
a. Clutch packs may be pressure tested using high pressure air.
b. Metal contaminated torque converters may be flushed and re-used.
c. Clutch packs may be pressure tested using low pressure air.
d. Metal contaminated coolers may be flushed and re-used.
c. Clutch packs may be pressure tested using low pressure air.
Which statement is true when repairing automatic transmissions?
a. Cooler lines must be flushed before the transmission is removed.
b. Clutch pack clearances must be measured before replacement.
c. Clutch pack plates are lubricated with Vaseline before installing.
d. Cooler lines must be flushed before the transmission is installed.
d. Cooler lines must be flushed before the transmission is installed.
