Driveshafts

What is one of the most common causes of universal joint and driveshaft failures?

• Lack of proper lubrication
• Free Play
• Rust
• Radial Play

Which of the following tools is preferred when separating a U-joint from a driveshaft?

• a slide hammer
• a puller
• a sledge hammer
• a hydraulic jack

A driveshaft is in phase when

• the driveshaft yoke is aligned on the same plane as the transmission yoke
• all of the above
• the driveshaft is perfectly balanced
• the slip yoke and driveshaft tube yoke lugs are perfectly aligned

What is the material of choice for the driveshaft tube for the heavy-truck market because of its strength?

• Aluminum
• Brass
• Fiberglass
• Steel

A single u-joint may sometimes have two grease fittings in the cross, and both are required to be greased when servicing

• True
• False

When lubricating a U-joint, fresh grease appears at all four trunnion seals. Which of the following is probably true?

• the bearings are worn and should be replaced.
• the U-joint has been properly lubricated
• the trunnions are worn and the U-joint should be replaced.
• the seals are worn and should be replaced.

_____________ allows for the driveshaft to lengthen and shorten due to suspension movement.

• Universal Joint
• Carrier Bearing
• End Yoke
• Slip Yoke

When greasing a U-joint, grease only exits from three of the four journal seals on the trunnion. What should you do 1st?

• Replace the U-joint.
• Leave it; three of four journals are good enough
• Heat the trunnion with a rosebud.
• Loosen the journal cap and try again.

U-joint failures, hanger bearing failures, and driveline vibrations are caused by

• Loose Yokes
• bent driveshafts
• missing balance weights
• all of the above

Center bearings are typically permanently ___________.

• Restricted
• Lubricated
• Connected
• Mounted