If the yoke is the full-round type, place the protractor base on the outside surface of the
machined shoulder as shown in
Figure 8-63
. The protractor should read the angle of the
engine/transmission inclination. If the output yoke is more than 1l degree out of vertical
alignment, it is either loose or it is distorted and should be replaced.
Figure 8-62 - Checking vertical
alignment of a half-round yoke.
Figure 8-63 - Checking vertical
alignment of a full-round end
yoke.
When checking the input yoke attached to the pinion shaft of a drive axle, jack up one
wheel and rotate the wheel until the lugs of the yoke are aligned vertically. Then
measure the vertical alignment of the yoke, using the foregoing procedure just
described for checking the transmission output yoke. Refer to
Figure 8-64
, which
outlines a driveshaft troubleshooting guide.
4.10.0 PTO Driveshafts
In some applications, an auxiliary power unit, such as a pump, can be directly mounted
to the power takeoff (PTO) assembly (
Figure 8-65, View A
). However, it is more
common to locate PTO driven units remotely and drive them using a driveshaft (
Figure
8-65, View B
).
NAVEDTRA 14050A
8-69
