PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
Alignment & Adjustments
34
17730-283
SECTION 7
Alignment & Adjustments
RIDE HEIGHT
NOTE
The height control valve is not supplied by Hendrickson, although it is a required component.
Hendrickson is not responsible for components supplied by the vehicle manufacturer. For
assistance with inspection, maintenance and rebuild instructions on these components, refer to
vehicle manufacturer’s instructions.
LATERAL ALIGNMENT
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 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.
7. Ensure all drive axle tires are the same size and properly inflated.
8. Measure from the outside of the frame rail to the rim flange of the inner tire. Record the
measurement.
9. Measure the same distance on the opposite side of the same axle. Record the
measurement.
10. Subtract the two measurements to get a difference between the two. If the difference is
greater than
1
⁄
8
" (3 mm), it will be necessary to correct the lateral alignment. Adding or
removing shims that are located between the transverse torque rod and frame rail accom-
plishes this.
■
A general rule of thumb is to use a shim with a thickness that is half of the difference
between the two measurements.
EXAMPLE
If the lateral alignment is out of specification by ¼" (6mm), remove or install a
1
⁄
8
" (3mm)
shim between the transverse torque rod and frame rail as needed. Refer to Longitudinal and
Transverse Torque Rod Section in Preventive Maintenance Section of this publication.
NOTE
Hendrickson recommends the use of Grade 8 bolts and Grade C locknuts be used for all torque
rod attachments
DRIVE AXLE ALIGNMENT INSPECTION PROCEDURE
Proper alignment is essential for maximum ride quality, performance, and tire service life, the recom-
mended 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.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
