TM 55-1520-240-23-5 6-6 REMOVE COMBINING TRANSMISSION FORWARD ADAPTER ASSEMBLY     (Continued) 6-6 4. Clean splines of output shaft (7) using dry cleaning solvent (E162) and cloths (E120). Wear gloves (E184.1). 5. Inspect splines on output shaft (7) for wear.  If wear is evident, proceed as follows: a. Place a straightedge (6 inch  metal ruler or equivalent) along the length of the spline, with the ruler spanning the worn area. b. Using a feeler gauge, measure the depth of wear below the face of the spline. c. If spline wear exceeds  0.005 inch, replace combining transmission. FOLLOW-ON MAINTENANCE: None END OF TASK Change 1 6-22.1/(6-22.2 blank)