PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
Preventive Maintenance
24
17730-283
SECTION 6
Preventive Maintenance
Following appropriate inspection procedures is important to help ensure the proper mainte-
nance and operation of the suspension system and component parts function to their highest
efficiency. Hendrickson recommends PRIMAAX EX / PRIMAAX heavy-duty rear suspensions be
inspected at pre-delivery, the first 1,000 miles of service and at the regular preventive main-
tenance intervals. Off-highway and severe service operating conditions require more frequent
inspections than on-highway service operation.
NOTE
Torque values shown in this publication apply only if Hendrickson supplied fasteners are
used. If non Hendrickson fasteners are used, follow the torque specification listed in the vehicle
manufacturer’s service manual.
AREAS OF INSPECTION
The inspection must include the following components:
➤
Air springs
•
Frame hanger bracket
•
Torque rods
•
Air supply and fittings
➤
QUIK-ALIGN connections
– Transverse
•
All fasteners
•
S-cam support tube bracket
– Longitudinal
➤
Clamp group
•
Shock absorbers
➤
U-beam assembly
➤
Top pad
•
Suspension wear and damage
•
Cross tube
➤
U-bolt locknuts
•
Tire wear
•
Support beam
•
End cap (if equipped)
➤
Signifi es performance critical components.
HENDRICKSON RECOMMENDED PREVENTIVE MAINTENANCE INTERVALS
PRE-DELIVERY INSPECTION
– PRIMAAX EX
1. Visually inspect the suspension for proper assembly.
2. Verify the lateral alignment of the drive axles are within the vehicle manufacturer’s toler-
ances, contact the vehicle manufacturer for the correct lateral alignment instructions.
3. Visually inspect the overall condition of the U-beam assembly (support beam assembly,
cross tube, and integrated end cap) for any damage.
4.
DO NOT RE-TORQUE
the integrated end cap (vehicles built
AFTER
March 2009), see
Figure 6-1.
5. Check all other fasteners for proper torque with special attention to the following suspen-
sion connections:
■
QUIK-ALIGN fasteners, see Figure 6-2.
■
Torque rod to top pad fasteners, see Figure 6-2.
■
Clamp group fasteners (U-bolts), see Figure 6-3.
6. Verify the ride height is within specification. Ride height is measured from the bottom of the
frame rail to the centerline of the axle.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]