4-26 DRIVE LINES, POWER TRAIN - Continued
4-26.3 Drive Shafts - Continued
Slip Joint Inspection
The slip joint can be inspected with the drive shafts mounted in the truck.
Using an opposing to and fro twisting motion, look for excessive movement between the two shaft halves.
If play appears excessive use a dial gage to measure the movement. Movement must not exceed 0.007
in. (0 18 mm). Evidence of damage of any kind is cause for rejection. Replace component or assembly
Using a hand grease gun, lubricate the slip joint until grease (item 16, Appendix E) is expelled from
pressure relief hole in welch plug. Cover pressure relief hole and continue lubricating until grease
appears at slip yoke dust cap.
Center Bearing Inspection
Remove the front axle to center bearing drive shaft as described in para. 4-26.3.
Support drive shaft tube in a vise.
Rotate center bearing bracket. If binding or grinding is observed refer to Center Bearing Repair, see para.
Axle and Transmission Yoke Inspection
Dry cleaning solvent P-D-680 (safety or Stoddard's solvent) is potentially dangerous. Avoid
repeated and prolonged breathing of vapors and skin contact with the liquid. Do not use near
open flame, arcing equipment or other ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100 to 138 deg. F (30 to 59 deg. C).
Using dry cleaning solvent (item 10, Appendix E), clean the yokes.
Death or serious injury could occur if compressed air is directed against the skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11
kg/cm2) or less. When working with compressed air always use chip guards, eye protection
and other personal protective equipment.
After washing, dry the yokes using compressed air.
Inspect yokes see para. 4-26.1.