Turntable Bearing Inspection Procedures-continued

TB 9-2320-279-34

NOTE

Measurements with boom nose positioned over passenger side shown.

Lower boom (1) to obtain a level boom angle.

Use the telescoping gage (2) and micrometer (3) to measure the distance between the bottom of

the superstructure (4) and the subframe (5). The telescoping gage (2) must be in line with the

axial centerline of the crane boom, with the gages barrel just touching the swing gear tooth.

Record measurement.

Operate boom up control until boom angle is 60 degrees.

Use the telescoping gage (2) and micrometer (3) to measure the distance between the bottom of

the superstructure (4) and the subframe (5). The telescoping gage (2) must be in line with the

axial centerline of the crane boom, with the gages barrel just touching the swing gear tooth.

Record measurement.

If the difference between the two readings is equal to or over .065 inches (1.65 mm), institute

bearing replacement procedures. If the difference between the two readings is under .065 inches

(1.65 mm), continue the inspection procedure.

If the differences in readings for both passenger and driver side are under .065 inches (1.65 mm),

the inspection procedure is complete, return crane to service.

PIN: 065187--001

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