PRIMAAX
®
EX / PRIMAAX
®
for Volvo Vehicles
17730-254 29 Component Replacement
SECTION 8
Component Replacement
FASTENERS
When servicing a vehicle, Hendrickson recommends replacing all removed fasteners with new
equivalent fasteners. Torque specs are for Hendrickson supplied fasteners. Maintain correct
torque values at all times. Check torque values as specified in Torque Specifications Section
of this publication. If non-Hendrickson fasteners are used follow torque specifications and re-
torque intervals listed in the vehicle manufacturer’s service manual.
HEIGHT CONTROL VALVE
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 assis-
tance with inspection, adjustments, maintenance, replacement and rebuild instructions on
these components see vehicle manufacturer.
AIR SPRING
DISASSEMBLY
1. Chock the wheels.
2. Support the frame.
3. Disconnect the height control valve’s leveling valve arm(s) from the rubber grommet (see
vehicle manufacturers 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.
4. See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of
this publication prior to deflating or inflating the air system.
5. Lower the height control valve arm(s) to exhaust the air in the air springs and deflate the
rear suspension.
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. Remove the air line from the air spring.
IF THE AIR SPRING IS BEING REMOVED, 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. If the air spring is being removed for an alternate repair it will be necessary to lubricate the
lower mounting fasteners with penetrating oil. This will help prevent the air spring mount-
ing studs from breaking during the removal process. Remove the lower mounting fasteners
from the air springs using HAND TOOLS only.
8. Remove the lower air spring mounting bracket from the cross tube.
9. Remove the fasteners from the upper air spring mounting bracket and the frame.
10. Remove the air spring.
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