SUSPENSION ALIGNMENTGENERALBefore performing axle alignment or upper torque rodadjustment, remove road debris from suspension andperform the preliminary procedures listed below.1.Park vehicle on a level floor.2.Release parking brake.3.Check rear wheels for runout and correct ifnecessary.4.Move vehicle forward and rearward severaltimes to relieve internal stress.5.Turn wheels in a straight ahead position.AXLE ALIGNMENTThe following alignment check (measuring of thesuspension) applies to all tandem suspensions coveredin this manual, all 4 X 2 vehicles having springsuspension with torque rods, and IH air suspensions withtapered leaf springs. In the event axle adjustment isnecessary, refer to the AXLE ADJUSTMENT portion ofthis section and the appropriate procedure for thesuspension being serviced.1.Clamp a straightedge to top frame rail ahead offorward rear axle on 6 x 4 vehicles and ahead of rearaxles on 4 x 2 vehicles. Use a framing squareagainst straightedge and outside surface of theframe side member to insure straightedge isperpendicular to frame, as in Figure 1.Figure 1 - Straightedge Location on Frame2.Suspend a plumb bob from the straightedge in frontof the tire and on outboard side of the forward rearaxle on 6 x 4 vehicles or rear axle on 4 x 2 vehicles.(See Figure 2.)3.Position a slotted bar such that pointers are engagedin center hole of (both) rear axles(s).Figure 2 - Plumb Bob Locations4.Measure distance between cord of plum bob andpointer on forward rear axle of 6 x 4 vehicles or rearaxle on 4 x 2 vehicles. Record dimension "A" as inFigure 3.Figure 3 - Measure Dimension "A"5.Position slotted bar with pointers on opposite side ofvehicle in same manner and measure correspondingdistance as in Step 4. Record this dimension.6.Any difference in dimensions from side to side inexcess of 3.175 mm (.125 inches) must beequalized.7.Refer to the AXLE ADJUSTMENT portion of thissection for procedures to equalize difference indimensions which exceed 3.175 mm (.125 inches).CTS-4016W - Page 2
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