of dirt and grease forms an abrasive that will wear parts
in a hurry. Never use so much grease on these joints that
the grease will be forced out of the boot. The extra grease
will be lost and the added weight of the grease will tend
to throw the propeller shaft out of balance.
When you are to give a vehicle a thorough inspec-
tion, inspect the power trains for loose gear housings and
joints. Look for bent propeller shafts that are responsible
for vibrations, and examine the gear housings and joints
for missing screws and bolts. Check to see that the
U-bolts fastening the springs to the rear axle housing are
tight. A loose spring hanger can throw the rear axle
assembly out of line and place additional strain on the
propeller shaft and final drive. When making these
inspections, always tighten the lugs that fasten wheels
to live axles.
After tightening gear housings, loose connections,
and joints, and finding that no repairs are required, road
test the vehicle to see if the various units in the power
train are working properly. Shift the gears into all
operating speeds and listen for noisy or grinding gears.
Army Institute for Professional Development, Sub-
course OD 1005, U.S. Army Ordnance Center and
School, Wheeled Vehicle Clutches, Transmissions,
and Transfers, Aberdeen Proving Ground,
Aberdeen, Md., 1986.
Construction Mechanic 1, Naval Education and
Training Program Management Support Activity,
Pensacola, Fla., 1989.
U.S. Army, TM 9-2320-211-35, Direct Support,
General Support and Depot Maintenance for Truck
5 Ton. M51 Series, Department of the Army,
Washington, D.C., 1964.
U.S. Army, TM 9-8000, Principles of Automotive
Vehicles, Department of the Army, Washington,