PRIMAAX
®
EX / PRIMAAX
®
for Volvo Vehicles
Alignment & Adjustments
24
17730-254
AXLE PINION ANGLE
FIGURE
7-1
Drive axle pinion angles are
established by the vehicle
manufacturer. The suspension
axle brackets called out in the
Pinion Angle Chart in the Parts
Lists Section of this publication,
are machined to specific angles
to meet the vehicle manufac-
turer specified requirements. If
it is necessary to fine tune the
pinion angle see Alignment &
Adjustments Section of this publication.
To check the pinion angle, verify first that the suspension is at the proper ride height (Refer to
vehicle manufacturer for more information on Ride Height Adjustments). Place a digital protrac-
tor on the axle housing as shown in Figure 7-1. Check that the pinion angle is within the range
specified by the vehicle manufacturer.
DRIVE AXLE ALIGNMENT INSPECTION PROCEDURE (SCRUB ANGLE)
Proper alignment is essential for maximum ride quality, performance, and tire life, the rec-
ommended alignment procedure is described below. This procedure should be performed if
excessive or irregular tire wear is observed, or any time the QUIK-ALIGN connection is loosened
or removed.
1. Use a work bay with a level surface.
2. Relax the suspension by slowly moving the vehicle back and forth several times in a straight
line without using the brakes. This will slacken or loosen the suspension as the vehicle is
positioned. End with all wheels positioned straight ahead.
3.
DO NOT
set the parking brake. Chock the front wheels of the vehicle.
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 Ride Height
Adjustment in this section.
6. Verify all suspension components are in good condition. Repair or replace any worn or
damaged suspension components before proceeding with the alignment process.
7. Ensure all drive axle tires are the same size and properly inflated.
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
7-2. 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 7-2,
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
