Drive Axle Alignment; Procedure; Drive Axle Alignment Specifications - PREVOST H3-41 Maintenance Manual

SECTION 11: REAR AXLES
2.9

DRIVE AXLE ALIGNMENT

NOTE
For drive axle alignment specifications, refer to
paragraph 2.9.2 '' Drive Axle Alignment
Specifications'' in this section.
The drive axle alignment consists in aligning the
axle according to the frame. The axle must be
perpendicular to the frame. The alignment is
achieved with the use of shims inserted between
the lower longitudinal radius rod supports and
the frame.
Drive axle alignment is factory set and is not
subject to any change, except if the vehicle has
been damaged by an accident or if there are
requirements for replacement.
If the axle has been removed for repairs or
servicing and if all the parts are reinstalled
exactly in the same place, the axle alignment is
not necessary. However, if the suspension
supports have been replaced or altered, proceed
with the following instructions to verify or adjust
the drive axle alignment.
NOTE
When drive axle alignment is modified, tag
axle alignment must be re-verified.
2.9.1

Procedure

1. Park vehicle on a level surface, then chock
front vehicle wheels.
2. Using two jacking points (which are at least
30 inches [76 cm] apart) on drive axle, raise
the vehicle sufficiently so that wheels can
turn freely at about ½ inch from ground.
Secure in this position with safety stands,
and release parking brake.
3. Install wheel mount sensors on front and
drive axles (Figure 7).
NOTE
See reference numbers on wheel mount
sensors (Figure 7).
NOTE
Select axle specifications in the appropriate
chart.
2.9.2

Drive Axle Alignment Specifications

With the system installed as for front axle
alignment (Figure 7), adjust drive axle according
10
PA1621 Maintenance Manual All Series | January 2017
to specifications chart below. Use static wheel
alignment systems which work with angle
measurements only, such as Josam or Hunter
systems. Static alignment specifications are
listed in the following tables:
DRIVE AXLE ALL VEHICLES
Alignment / Minimum
value value
Thrust angle
(deg.)
Total Toe 0.18 Toe-
(deg.) in
FIGURE 7: FRONT & DRIVE AXLE ALIGNMENT
Nominal Maximum
value value
±0.11°
0 0.18 Toe-in
11025