CHAPTER 3. MAINTENANCE INSTRUCTION

TM 55-4920-425-13&P

CHAPTER 3

MAINTENANCE INSTRUCTION

Section I. PREPARATION FOR INSTALLATION, STORAGE AND SHIPMENT

3-1. Preinstallation Inspection . On receipt, inspect instrument for any mechanical damage that may have occurred

during shipment and test the electrical performance The rate of turn should be checked as well as operation of the clutch

and vibrator motor (refer to para 3-8).

3-2. Installation . The instrument should be placed on a rigid bench and carefully leveled with the four leveling screws

When lifting instrument always be sure the cradle is in its upright locked position and lift by the base.

3-3. Storage And Reshipment. Use the original shipping cartons and packaging materials for reshipment. If they are

not available, repackage the instrument in accordance with the preservation, packaging, packing and marking

requirements outlined in Figure 3-1.

Section II. INSPECTIONS AND SERVICING

3-4. Inspections.

NOTE

This should be a thorough and searching inspection conducted after every 120 hours of operation.

a. Remove and/or disconnect any electrical connectors attached to the "MS" type electrical receptacles in the rear

cradle panel.

b. Remove and/or disconnect any electrical connectors attached to the "MS" type electrical receptacles in the rim of

the table (rotating plate).

c. Remove any pneumatic connection: hose, tubing lines, etc., attached to the stationary pneumatic connector in the

rear cradle panel.

d. Remove any pneumatic connection attached to the nipple in the rim of the table.

e. Using a soft cloth, paint brush, etc., remove excess dust, lint, foreign materials, etc., from the table assembly.

f. Visually inspect for loose, damaged and/or missing parts, obvious shipping damage, damaged power cord, blow or

missing fuse, etc.

g. If required, connect the power cord to the proper electrical source (117V, 60 Hz single phase current) and operate

the table in directions and rates of turn. Note failure to operate, blown fuse, undue noise, etc.

h. Turn switches to OFF, DEG/SEC knob to OFF, and disconnect power cord from electrical power source.

i. Remove screws and front cradle panel.

j. Inspect timing belts for excessive wear and for proper belt tension. Note that the center (table) shaft is fixed and

belt tension adjustments must be made at the clutch first and the motor second.

k. Inspect electrical wiring for loose connections, broken wires, frayed, burned, or otherwise damaged insulation,

and/or broken solder joints.

I. Tilt the cradle to its 90 degree position making sure the locking pin is engaged to hold it. Remove appropriate

screws and base cover.

m. Inspect electrical wiring for loose connections, broken wires, frayed, burned, or otherwise damaged insulation,

and/or broken solder joints.

3-5. Servicing. Organizational service consists of cleaning, painting and lubrication. For painting instruction refer to

TM 43-0139 Refer to paragraph 3-6 for lubrication instructions. Refer to paragraph 3-7 for cleaning instructions

Section III. PREVENTIVE MAINTENANCE

3-6. Lubrication. All rotating bearings are either sealed aircraft type, ball and race or oil impregnated bronze none of

which require further lubrication. The motor gear reducer unit operates in grease (Item 1, Table 1-1) and the motor

bearings are sealed and no lubrication is required.

3-1