PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
17730-283
29
Preventive Maintenance
PIVOT BUSHING AND D-PIN BUSHING INSPECTION
THE PIVOT BUSHING AND D-PIN BUSHING ARE CRITICAL COMPONENTS OF PRIMAAX EX / PRIMAAX
SUSPENSIONS. IF ANY SUCH COMPONENTS APPEAR DAMAGED OR WORN THE COMPONENT MUST
BE REPLACED. FAILURE TO REPLACE SUCH WORN OR DAMAGED COMPONENTS CAN RESULT IN THE
DEFORMATION OF PARTS, LOSS OF CLAMP FORCE, BOLT FAILURE, LOSS OF THE AXLE’S ALIGNMENT,
LOSS OF VEHICLE CONTROL, PROPERTY DAMAGE, OR PERSONAL INJURY.
There are two types of pivot bushing inspections for PRIMAAX EX • PRIMAAX suspension sys-
tems. The pivot bushing can be visually inspected by looking at the outer rubber flange(s) of
the bushing. If the visual inspection warrants, a physical inspection can be conducted in which
disassembly is required.
PIVOT BUSHING VISUAL INSPECTION
To perform pivot bushing visual inspection, it is not necessary to disassemble the pivot bushing
connection. If the pivot bushing rubber flange(s) are intact and there are no signs of metal to
metal contact the bushing does not require replacement.
■
The support beam is designed with the pivot bushing centered in the support beam end
hub. If the pivot bushing is not centered in the end hub, it is an indication that the pivot
bushing could be worn and a pivot bushing physical inspection is required.
■
If the pivot bushing shows signs of torn, separated or disconnected rubber, see Figures
6-7 and 6-8, this could be a result of axle misalignment. If this condition is evident, a pivot
bushing physical inspection is required.
■
If the outer rubber flange(s) is missing, or there are shards of rubber visible, see Figure 6-9,
this could be a result of axle misalignment. If this condition is evident, pivot bushing
replacement is required.
PIVOT BUSHING PHYSICAL INSPECTION
1. Remove the U-beam assembly, refer to
U-beam Assembly in the Component
Replacement of this publication.
2. After removal, inspect the pivot bushing
connection, examine the pivot bushing
inner metal area.
3. No replacement is needed if the bush-
ing exhibits a tight joint, see Figure
6-10. An imprinted two-line wear
pattern on the bushing inner metal
indicates the pivot bushing is securely
clamped in the frame hanger.
INSPECT FOR TORN, DISCONNECTED OR MISSING RUBBER FLANGE
Torn Rubber
Disconnected Rubber Flange
Missing Rubber Flange
FIGURE 6-7
FIGURE 6-8
FIGURE 6-9
FIGURE 6-10
An imprinted two-line wear
pattern exhibits a tight joint
GOOD JOINT - NO REPLACEMENT NEEDED
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
