TM 11-5840-360-14-1-1
Table 5-2 Preventive Maintenance Schedule
Preventive Maintenance
Procedure
Activity
Paragraph
W
M
S-A
A
1. Performance Check
X
X
X
X
2. Inspect all equipments
X
X
X
3. Clean all equipments
X
X
X
4. Lubricate Pedestal AB-1247/1247A
X
X
X
5. Check Belt Tension AB-1247/1247A
X
X
X
6. Check Sheave Alignment AB-1247/1247A
X
X
7. Inspect Drive System AB-1247/1247A
X
8. Inspect Cover Gasket AB-12L47/1247A
X
9. Lubricate Pedestal AB-1248 (V4)
X
X
X
10. Check Belt Tension AB-1248 (V4)
X
X
X
11. Clean Air Filters RT-1241 (V4)
X
X
X
12. Check Sheave Alignment AB-1248 (V4)
X
X
13. Inspect Drive System AB-1248 (V4)
X
14. Inspect Access Hatch Gasket AB-1248 (V4)
X
15. High Voltage Arc Prevention
As Required
16. Condensation Prevention
As Required
* Frequency: W - Weekly, M - Monthly, S-A - Semiannually, A - Annually
3. Temporarily snug the four motor mounting bolts.
5.7.1.3 Belt Tension Check and Alignment. - Gain
Rotate the drive sheave a few times to check for ease of
access per steps 1, 2 and 3 of paragraph 5.7.1.2, Using
operation, and then check belt tension again. If the
a tension gauge, check for belt deflection of 1/8" when 4
tension is correct, tighten the four motor mounting bolts.
to 5 pounds of tension are applied to the belt midway
If the tension is incorrect, repeat this procedure.
between the sheaves (see Figure 5-4). If tension is
incorrect, adjust as follows:
5.7.1.4 Sheave Alignment Check. - Check sheave
1. Loosen the four motor mounting bolts. Insert
alignment as follows:
screwdriver through tension adjustment slot and engage
1. Set Antenna Safety Switch OFF.
teeth on motor mounting plate.
2. Gain access per steps 1,2 and 3 of paragraph
2. To increase belt tension, move the motor away
from the driven sheave. To decrease belt tension,
move the motor toward the driven sheave.
5-4
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