REV CJune 2005 Section 3 • Scheduled Maintenance ProceduresPart No. 52075 TMZ-34/19 3 - 25CHECKLIST D PROCEDURESabcdD-2Inspect forTurntable Bearing WearPeriodic inspection of turntable bearing wear isessential to safe machine operation, good machineperformance and service life. Continued use of aworn turntable bearing could create an unsafeoperating condition, resulting in death or seriousinjury and component damage.Perform this procedure with themachine on a firm, level surfaceand the boom in the stowedposition.1 Grease the turntable bearing. See A-11, Greasethe Turntable Rotation Bearing and RotateGear.2 Torque the turntable bearing bolts tospecification. See D-1, Check the TurntableRotation Bearing Bolts.3 Start the machine from the ground controls andraise the primary and secondary booms to fullheight. Do not extend the primary boom.4 Place a dial indicator between the drive chassisand the turntable at a point that is directlyunder, or inline with, the boom and no morethan 1 inch / 2.5 cm from the bearing.To obtain an accuratemeasurement, place the dialindicator no more than1 inch / 2.5 cm from the turntablerotation bearing.5 At the dial indicator, adjust it to "zero" theindicator.a turntableb dial indicatorc drive chassisd turntable rotation bearing6 Lower the secondary boom to the stowedposition and lower the primary boom to ahorizontal position. Fully extend the primaryboom.7 Note the reading on the dial indicator.Result: The measurement is less than0.025 inch / 0.635 mm. The bearing is good.Result: The measurement is more than0.0249 inch / 0.634 mm. The bearing is wornand needs to be replaced.8 Fully retract the primary boom. Raise theprimary and secondary booms to full height.Visually inspect the dial indicator to be sure theneedle returns to the "zero" position.9 Remove the dial indicator and rotate theturntable 90°.10 Repeat steps 4 through 9 until the rotationbearing has been checked in at least fourequally spaced areas 90° apart.11 Lower the primary and secondary booms to thestowed position and turn the machine off.12 Remove the dial indicator from the machine.800-610-4101ActionRental.com
