SECTION III. PREVENTATIVE MAINTENANCE

TM 55-4920-415-13&P

Observe the glass window, oil level indicator to

b. Remove the oil plug (11, Figure 1-1) and fill the

check the proper amount.

gear box with suitable oil given in Table 3-1.

SECTION III. PREVENTATIVE MAINTENANCE

3-7. Services Performed by the Operator.

These

services are performed on a daily basis.

Table 3-2: Daily Services

Prior to

During

Securing

Operation

Unit

Service

Indicator Lights - Inspect them.

Replace the fuse or lamp as necessary.

Oil Leaks - Inspect the gear box for oil

leaks.

Oil Level - Check the oil level.

Make sure the type meets the temperature

requirements.

Cleaning - Use a cloth moistened with an

approved solvent to clean the gyro tester.

3-8. Services Performed at Six Month Intervals

Table 3-3: Six Month Services

Inspection

Functional

Service

Visual Inspection - Check the unit overall for loose, missing,

or broken parts. Make sure the unit is correctly assembled.

Correct any deficiencies before placing unit in operation.

Electrical Wiring - Check the unit for loose or bare wires or

corroded connections. Replace the defective wiring. Use a

fine sandpaper to clean connector terminals.

Prior to Operation - Perform the services listed in Table 3-2.

prior to operation.

Fork Rotation Speed - Check the rotational rate of the fork

with the use of a stop watch against the nominal setting

given on the rotational rate switch (26, Figure 2-1.), Paragraph

3-19 lists the allowable tolerances.

3-2