TRUCK SERVICE MANUAL
PROPELLER SHAFT
General
should indicate same number of degrees previously
determined with protractor at engine (90 degrees minus
engine angle).
If engine angle and yoke angle are not the same or
within 1/2 degree of each other, check opposite lug
before taking corrective measures.
If excessive misalignment still exists, replace yoke and
recheck.
If bearing retainer and cap are integral, protractor
may be placed on cap--providing cap is flat. If cap is
dome shaped, remove cap and bearing and place
protractor on outside machined surface of yoke lug, Fig.
20.
Yoke Horizontal Alignment
Procedures for checking horizontal alignment of a
Fig. 19 Checking Yoke Run-Out
yoke are same as for checking a flange; however, a
piece of round bar stock that is a slip fit in the yoke
Yoke Vertical Alignment
bearing bores is used in lieu of a flat bar straight edge.
If a slip fit gauge bar is not available, a piece of
Yoke vertical alignment can be checked at
round stock slightly smaller than the yoke bearing bore
either the top or bottom lug, whichever is most
inside diameter can be used.
accessible.
Position the smaller stock through the bearing bores and
tap a wooden wedge between it and the yoke shaft.
Locate the vehicle on a level floor and using
Check with a protractor or square to see that the bar is
an SE-2067 magnetic base protractor, deter-
exactly 90 degrees to the machined outside face of the
mine the engine angle (same as when checking
yoke lugs.
flange vertical alignment).
Measure the distance between the gauge bar and
straight edge clamped on the frame as when checking
If cap and bearing retainer are separate
flange horizontal alignment.
pieces, remove lock strap and cap. Pull re-
Corrective
measures
for
yoke
horizontal
tainer out so that it extends approximately 1/8"
misalignment are the same as for flange misalignment.
beyond yoke lug.
MULTIPLE DRIVE LINE ALIGNMENT
All vehicles having more than one propeller shaft or
drive line require the same degree of accuracy for
checking each component. This means that the flanges
and yokes of all auxiliary units and tandem drive axles
should be similarly checked.
UNIVERSAL JOINT LUBRICATION
Light- Duty Models
Joints with plugs or fittings: Lubricate under low
pressure every 20, 000 miles. Too much pressure will
damage oil seals. Use Lithium 12-Hydroxy Stearate EP
grease. Joints without plugs or fittings: Every 50, 000
miles clean and inspect joints, repack with Lithium 12-
Fig. 20 Checking Yoke Vertical Alignment
Hydroxy Stearate EP grease. NOTE: Frequent use of
vehicles in off-the-road operations that encounter mud
Place protractor on bearing retainer at right angle to
and water, lubricate or repack joints every 12, 000 miles.
vehicle center line. Rotate yoke until bearing bores are
vertical (dial reads zero). Without turning yoke rotate
protractor 90 degrees, placing it parallel with the vehicle
center line (in line with propeller shaft). Dial
602
