PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
17730-283
35
Alignment & Adjustments
4. Verify and maintain the air system at full operating pressure.
5. Verify the vehicle is at the correct ride height. Correct as necessary. Refer to vehicle manu-
facturer for proper ride height adjustment.
6. Verify all suspension components are in good condition. Repair or replace any worn or
damaged suspension components before proceeding with the alignment process.
FIGURE
7-1
7. Ensure all drive axle tires are the
same size.
8. If axle alignment equipment is not
available, using “C” clamps, securely
clamp a six-foot piece of STRAIGHT
bar stock or angle iron across the
lower frame flange as shown in Figure
7-1. Select a location for the angle
iron as far forward of the drive axle as
possible where components will not
interfere.
9. Accurately square the straight edge to
the frame using a carpenter’s square.
10. Using a measuring tape, measure
from the straight edge to the forward
face of the front drive axle arms at the
centerline on both sides of the vehicle as shown in Figure 7-1,
A
and
B
.
11. Calculate the difference between measurements
A
and
B
.
a. If the front drive axle is within vehicle manufacturer’s specifications, proceed to check
the rear drive axle (Step 12).
b. If alignment of the front drive axle
IS NOT
within the vehicle manufacturer’s specifica-
tions, then the alignment of this axle
MUST
be corrected
BEFORE
measuring the rear
drive axle alignment (Step 12). Correct the alignment of this axle by following the
proper alignment instructions for PRIMAAX EX / PRIMAAX suspension model as deter-
mined by the ride height of the suspension.
NOTE
Since the remaining drive axle(s) will be aligned relative to the front drive axle, it is essential
that the front drive axle is aligned within the vehicle manufacturer’s specifications prior to the
alignment of the remaining drive axle(s).
12. Using a trammel bar, measure the distance from the spindle center of the front drive axle to
the spindle center of the rear drive axle on both sides of the vehicle, see Figure 7-1,
C
and
D
.
13. Calculate the difference between measurements
C
and
D
.
a. If the measurements are within the vehicle manufacturer’s specifications, then the rear
drive axle alignment is acceptable. Proceed to check the pinion angles of the drive
axles (Step 15).
b. If alignment of the rear drive axle
IS NOT
within the vehicle manufacturer’s specifica-
tions, then the alignment of this axle
MUST
be corrected
BEFORE
checking the drive
axle pinion angles. Correct the alignment of this axle by following the proper align-
ment instructions for PRIMAAX EX / PRIMAAX suspension model as determined by the
ride height of the suspension.
14. Repeat Steps 12 and 13 for any remaining drive axle(s). Be sure all remaining drive axles
are aligned relative to the front drive axle.
15. After all drive axles are aligned, check the pinion angle of each drive axle with a digital
protractor. Refer to the vehicle manufacturer specifications for the required pinion angles,
see Figure 7-5.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
