PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
Component Replacement
48
17730-283
U-BEAM ASSEMBLY
IMPORTANT NOTICE
As of September 2010, Hendrickson introduced the new enhanced U-beam assembly design for
PRIMAAX EX suspensions equipped on new production vehicles and for the Aftermarket. The new
U-beam assembly results in a maintenance-free integrated end cap connection. Refer to Figure
6-1 in the Preventive Maintenance Section of this publication.
DISASSEMBLY
1. Chock the front wheels.
2. Support the frame at ride height.
3. Raise and support the axle being serviced. Remove the wheels.
4. Disconnect the height control valve linkage assembly from the height control valve arm(s),
see vehicle manufacturer’s instructions.
PRIOR TO AND DURING DEFLATION AND INFLATION OF THE AIR SUSPENSION SYSTEM, ENSURE THAT ALL
PERSONNEL AND EQUIPMENT ARE CLEAR FROM UNDER THE VEHICLE AND AROUND THE SERVICE AREA,
FAILURE TO DO SO CAN CAUSE SERIOUS PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE.
5. See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of
this publication prior to deflating or inflating the air system.
SOME VEHICLE APPLICATIONS, SUCH AS VEHICLES EQUIPPED WITH OUTRIGGERS, RETAIN SOME
PRESSURE IN THE AIR SPRINGS AT ALL TIMES. PRIOR TO PERFORMING ANY MAINTENANCE, SERVICE,
OR REPAIR OF THE SUSPENSION, VERIFY EACH AIR SPRING IS COMPLETELY DEFLATED. FAILURE TO
DO SO COULD RESULT IN SERIOUS PROPERTY DAMAGE AND/OR SEVERE PERSONAL INJURY.
6. Lower the linkage arm(s) to exhaust the air in the air springs and deflate the rear suspension.
IF THE AIR SPRING IS BEING REMOVED FOR AN ALTERNATE REPAIR, IT IS MANDATORY TO LUBRICATE
THE LOWER AIR SPRING FASTENERS WITH PENETRATING OIL AND REMOVE WITH HAND TOOLS TO
PREVENT DAMAGE TO THE LOWER AIR SPRING MOUNTING STUD. FAILURE TO DO SO CAN CAUSE
COMPONENT DAMAGE AND VOID WARRANTY.
7. Lubricate the lower mounting fasteners of the air springs with penetrating oil. This will help
prevent the air spring mounting studs from breaking during the removal process.
8. Remove and discard the lower mounting fasteners from the air springs using
HAND TOOLS
only.
9. Remove both the lower air spring mounting brackets to disconnect both air springs from the
cross tube, see Figure 8-12.
FIGURE 8-12
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
