Turntable Bearing Inspection Procedures-continued

TB 9-2320-279-34

With boom angle level, rotate boom (1) and position boom nose (2) to the front of the truck (Refer

to TM 9-2320-279-10).

Install a dial indicator (3) with magnetic base. Plunger (4) of dial indicator (3) must be in line

with the axial centerline of the crane boom (1), with the plunger tip centered as close as possible

under or over the tip of the swing gear tooth (5).

Adjust dial indicator (3) to preload the dial, then zero the dial indicator (3).

Operate boom up control until boom angle is 60 degrees.

Record dial indicator (3) reading.

If reading is equal to or over .065 inches (1.65 mm), institute bearing replacement procedures. If

reading is under .065 inches (1.65 mm), continue the inspection procedure.

If all readings are under .065 inches (1.65 mm), the inspection procedure is complete, return

crane to service.

Level boom angle and rotate boom to the passenger side of the truck. Repeat steps b. through g.

for measurements with boom positioned to both passenger and driver side.

Change 1

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