TM 5-6675-250-20
2 - 1 0 . T R O U B L E S H O O T I N G ( C o n t i n u e d)
Table 2-3. Troubleshooting (Continued).
M A L F U N C T I O N
TEST OR INSPECTION
CORRECTIVE ACTION
GYROSCOPIC REFERENCE UNIT (GRU) (Continued)
2 . B I N D I N G O F F I N E - L E V E L I N G A S S E M B L Y.
Step 1.
Check fine-leveling for lack of lubrication.
a. Apply a film of silicone lubricant, MIL-S-8660, item 7, Appendix C, to
shaft surface of spade (1).
b. Retract and extend spade several times to spread lubricant.
c. Wipe excess lubricant from assembly using a clean cloth.
d. Remove setscrew (2) from extension leg (3).
e. Insert molydisulfide lubricant, MIL-G-21164, item 4, Appendix C, into
setscrew hole.
f. Extend and retract spade several times to spread lubricant.
g. Install setscrew (2).
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