AXLE ALIGNMENT (Continued).
Aligning the Axles.
On the M870A3 trailer 1100 Series Tri-axle suspension system only one of the
lower torque rods for each axle is adjustable for axle alignment procedures.
The other three torque rods for each axle are fixed. Only one at a time of the
adjustable torque rods should be adjusted.
Starting with the front axle, loosen the torque rod eye pinch bolts on both ends of the
adjustable torque rod.
If the pinch bolt fasteners are badly corroded or damaged, remove and
discard the bolts and replace with new bolts.
Attach a pipe wrench to the torque rod tube and rotate the tube to either lengthen or
shorten the torque rod as required until dimensions "D" and "D1" are both the same within
a tolerance of 1/6 in. (4.233 mm).
If difficulty is encountered rotating the torque rod tube, the threaded ends
may have become corroded. Apply a quality penetrating oil to the threads. If
difficulty is still encountered, wedges may be driven between the eye lugs to
release the clamping effect. A chain type wrench is suggested when rotating
the torque rod.
Visually check the rubber bushings to be sure that they are not distorted and are evenly
distributed around the torque rod eye. If distortion is seen, neutralize (relax) the bushing as
previously described and recheck the dimension.
Tighten and torque the eye pinch bolts. If the bolts were discarded, replace with new
fasteners. Torque 1/2 in. NC bolts to 65 ft-lb (88.2 Nm) and 5/8 in. NC bolts to 135 ft-lb