PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
17730-283
27
Preventive Maintenance
■
Fasteners
— Visually inspect for any loose or damaged fasteners on the entire suspension.
Make sure all fasteners are tightened to a torque value within the specified torque range. See
Torque Specification Section in this publication for recommended torque requirements. Use
a calibrated torque wrench to check torque in a tightening direction. As soon as the fastener
starts to move, record the torque and correct the torque if necessary.
■
Frame hanger bracket
— Visually inspect for any signs of loose fasteners, movement, or
damage. Verify the frame attaching fasteners have the proper torque values maintained.
See the vehicle manufacturer for proper torque specifications.
■
Height control valve and Air lines
— Check the suspension air system for air leaks. Check
all air lines for proper routing. Check for chafing or pinched air lines. Check the height con-
trol valve linkage for damage or interference with peripheral components.
■
QUIK-ALIGN connection
— Visually inspect the connection for signs of looseness or
movement. Visually inspect the bushing for wear. Verify the connections have the prop-
er torque values maintained. See the Torque Specification Section of this publication for
recommended torque requirements.
■
S-Cam support tube bracket
(If equipped)
— Visually inspect the bracket for damage and
check for any loose or damaged fasteners.
■
Shock absorbers
— Visually inspect for any signs of dents or leakage. Misting is not con-
sidered a leak, see Shock Absorber Inspection in this section.
■
Tire wear
— Visually inspect the tires for wear patterns that may indicate suspension dam-
age or misalignment.
■
Top pad/Longitudinal torque rod connection
— Visually inspect the connection for signs
of movement or damage. Use a lever check to help assess movement in this joint, see
Longitudinal and Transverse Torque Rods in this section for proper inspection. Verify the Top
Pad/Longitudinal Torque Rod connections have the proper torque values maintained. See
the Torque Specifications Section of this publication for recommended torque requirements.
■
Torque rods
(longitudinal and transverse)
— All torque rods must be inspected for loose-
ness, torn or shredded rubber, and for proper fastener torque. If there is metal-to-metal
contact in the bushing joint, this is a sign of excessive bushing wear and the torque rod
needs to be serviced, see Longitudinal and Transverse Torque Rod inspection in this section.
NOTE
Some torque rods assemblies equipped on PRIMAAX EX / PRIMAAX suspensions have curled end
hubs and are not re-bushable. The entire torque rod assembly must be replaced. This feature
provides superior bushing retention in the torque rod end hub.
■
These torque rods can be identified by the part number 67428-XXX or the suffix N after any
part number (i.e. 62000-615N).
■
U-beam assembly
— Visually inspect the overall condition of the support beam for dents,
dings, or other damage on the outer edges of the beam flanges. Visually inspect the
D-pin bushings for tearing or extreme bulging. Check for any metal-to-metal contact in
the bushed joints.
■
Wear and damage
— Visually inspect all parts of the suspension for wear and damage.
Look for bent or cracked parts.
See vehicle manufacturer’s applicable publications for other preventive maintenance
requirements.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
