PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
Alignment & Adjustments
38
17730-283
AXLE PINION ANGLE
Drive axle pinion angles are established by the vehicle manufacturer. The suspension bottom
cap called out in the Parts Lists Section of this publication, are machined to specific angles to
meet the vehicle manufacturer specified requirements.
FIGURE
7-5
To check the pinion angle:
1. Verify the suspension is at
the proper ride height. Refer
to the vehicle manufacturer
for proper ride height adjust-
ment procedure.
2. Install a digital protractor (or
equivalent) on the axle hous-
ing as shown in Figure 7-1.
3. Check the pinion angle is within the range as specified by the vehicle manufacturer.
4. If pinion angle is within the acceptable range, then no pinion angle adjustment is
necessary.
5. If out of range, an adjustment is necessary, see Axle Pinion Angle Adjustment in this section.
AXLE PINION ANGLE ADJUSTMENT
ADJUSTMENT OF 1.5 DEGREES OR LESS
FIGURE 7-6
NOTE
When correcting the pinion angle
of an axle the correction must be in
equal amounts on both sides of the
axle. However, the total number of
shims per side may differ due to axle
alignment.
1. Loosen the fasteners connecting
the longitudinal torque rods to
the frame hangers.
2. I n s ta l l o r re m ov e s h i m s a s
required in equal amounts, to
both sides of the axle, to achieve
the proper pinion angle, see Figure 7-6. To increase the pinion angle install shims. To
decrease the pinion angle remove shims.
SERVICE HINT
A general rule of thumb is,
1
⁄
8
" change in the shim pack thickness will increase or decrease the
pinion angle by ½ degree.
3. Tighten the longitudinal torque rod fasteners to the proper specification, see Torque
Specification Section of this publication per model designation.
4. Re-check the pinion angle and verify it is within the vehicle manufacturer’s specifications.
ADJUSTMENT OF MORE THAN 1.5 DEGREES
If an adjustment of more than 1.5 degrees is required, it may be necessary to replace the
bottom cap with a bottom cap that will achieve the desired pinion angle. Contact the vehicle
manufacturer for acceptable bottom cap replacement to achieve the required pinion angle and
refer to the Parts List Section of this publication.
NOTE
After bottom cap replacement, a drive axle alignment is required.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
