PRIMAAX
®
EX / PRIMAAX
®
for Volvo Vehicles
17730-254
49
Component Replacement
PRIOR TO TIGHTENING THE U-BOLTS TO THE FINAL TORQUE, ENSURE THAT THE CROSS TUBE,
SUPPORT BEAM, AND THE BOTTOM CAP ASSEMBLY ARE CENTERED ON THE AXLE (A = B ±
1
/
8
"),
SEE FIGURE 8-34. FAILURE TO DO SO COULD CAUSE PREMATURE COMPONENT WEAR OR CAUSE
UNEVEN LOAD DISTRIBUTION.
5. Center cross tube, support beam, and the bottom cap assembly on the axle, (A = B ±
1
/
8
"),
see Figure 8-34.
SERVICE HINT
It may be necessary to raise the front of the differential to allow the D-pins to engage the
bottom cap.
6. Raise the support beam and cross tube assembly until the D-pins engage in the bottom
cap.
7. Install D-pin fasteners with the bolt heads on the forward side of the bottom cap, see Figure
8-35.
FIGURE 8-35
8. Lower the front differential to allow the full engagement of the D-pins into the bottom caps.
9. Prior to tightening the D-pin fasteners, verify the bottom cap is centered over the support
beam.
10. Tighten the D-Pin ¾" locknuts to 275-325 foot pounds torque.
FIGURE 8-36
11. Tighten the U-bolt locknuts evenly in 50 foot pounds increments in the
proper pattern to achieve uniform bolt tension, see Figure 8-36.
12. Rap the top of the U-bolts with a dead blow mallet, and retighten to the
proper torque.
DO NOT
exceed specified torque on U-bolt locknuts. Tight-
en the ¾" locknuts to 350-400 foot pounds torque, see Figure 8-35.
13. Pivot the shock back into the lower shock mount and install the lower shock absorber
mounting fastener. Tighten the
5
⁄
8
" locknuts to 200-225 foot pounds torque.
14. Install the air spring between the frame and the cross tube.
a.
PRIMAAX EX:
Ensure the slot in the bottom of the air spring engages the notch on the
top of the beam.
b.
PRIMAAX:
Ensure the “V” notch in the end cap engages the air spring locator tab on
the air spring.
