PRIMAAX
®
EX / PRIMAAX
®
for International Truck Vehicles
Preventive Maintenance
28
17730-283
U-BOLT LOCKNUTS
SERVICE HINT
Due to certain pinion angle configurations, the removal of the D-Pin bolts may be necessary to
access the U-bolt locknuts, see Figure 6-5.
FIGURE 6-5
1. U-bolt locknuts must be torqued to specification at preparation for delivery.
2. U-bolt locknuts must be re-torqued at 1,000 miles.
3. Thereafter, follow the inspection and re-torque intervals below:
■
Off-highway and severe service
– Every 25,000 miles or 6 months, whichever comes first
■
100% On-highway
– Every 50,000 miles or 12 months, whichever comes first
Off-highway and severe service operating conditions require more frequent inspections than
on-highway service operation.
NOTE
U-bolt clamp group hardware for PRIMAAX EX / PRIMAAX suspensions are ¾"-16 UNF Grade C
locknuts and ¾"-16 UNF Grade 8 U-bolts which are phosphate and oil coated.
IT IS IMPORTANT THAT THE U-BOLT CLAMP GROUP CONNECTION BE PROPERLY ALIGNED AND
HAVE THE PROPER TORQUE VALUES MAINTAINED. METAL SURFACES CAN WORK AND WEAR
AGAINST OTHER RELATED CLAMP GROUP COMPONENTS IF NOT PROPERLY ALIGNED OR PROPERLY
TIGHTENED TO MAINTAIN THE PROPER CLAMP FORCE. FAILURE TO DO SO CAN CAUSE PREMATURE
COMPONENT WEAR, POSSIBLE SEPARATION OF THE CLAMP GROUP, CAUSING LOSS OF VEHICLE
CONTROL, PROPERTY DAMAGE, OR PERSONAL INJURY.
FIGURE 6-6
4. Tighten the U-bolt locknuts evenly in 50 foot pounds increments to
350-400 foot pounds torque in the proper pattern to achieve uniform
bolt tension, see Figures 6-6.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • [email protected]
