SFN-20231013G_Re-weld the two-piece transverse torque arm

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TICO Document #: SFN-20231013G (formerly TES-230)

Complication: The two-piece transverse torque arm is failing due to an insufficient weld

Solution: Re-weld the two-piece transverse torque arm

Units Affected: 7069

Parts Required: None, unless torque arm is damaged (see below)

Planned Labor: 1 hour

Instructions:

  1. Park the vehicle on a flat surface, apply parking brake, and chock wheels. If your company utilizes a “Lock Out, Tag Out” policy, you should employ it during this procedure.

  2. Remove the damaged torque arm from the vehicle and inspect each component for any damage (cracks, bent, etc.). Damaged components will need to be replaced. See Figure #2 for component part numbers.

  1. Remove any residual weld left over from each torque arm component. See Figure #3.

Note: For the rest of this procedure, the rear suspension must be at its operating ride height.

  1. Start the engine and idle until the air system has reached its cutoff setting of 120 psi. An audible burst of air will be heard coming from the air dryer exhaust once this pressure has been reached.

  2. Shut the engine off.

  1. Assemble the male spacer bar into the female sleeve and install the torque arm onto the vehicle. See Figure #4.

  1. Ensure the axle is centered horizontally on the vehicle by measuring the distance between the tires and side of the frame. A measurement should be taken from each side. The difference between the two measurements should not exceed 1/4”. Adjust the lateral position of the axle as needed. See Figure #5.

  1. Using a paint pen or equivalent, mark the spacer bar through the ½” diameter hole on the female sleeve. See Figure #6.

  2. Remove the torque arm from the vehicle.

  1. Align the mark on the spacer bar with the ½” hole on the female sleeve and hold in position for welding.

  2. Weld a minimum ¼” convex fillet weld around the base of the female sleeve. See Figure #7.

See Figure #8 for the recommended welding process per Hendrickson Lit No. 59310-002 – Selection Guide and Welding Instructions:

  1. Reinstall the torque arm onto the vehicle.

  1. Torque the 5/8”-11 bolts to 125 ft-lbs.

  2. Torque the 1-1/4”-12 nut of the tapered bushing to 200 ft-lbs.

  1. Remove “Lock Out, Tag Out” plaque.

  1. Return vehicle to service.