TM  10-3930-638-24&P 3-31.   MAST   ASSEMBLY   MAINTENANCE   (cont) b. Side Shifter Frame and Rotation Bearing (cont). 13 STEP LOCATION ITEM ACTION REMARKS INSTALLATION/REPLACEMENT   (cont) WARNING (cont) Be sure sling hoist is securely fastened to carriage bearing plate before performing following step. Failure to do so could cause serious bodily injury. CAUTION Roller bearings (15) and shims (16) may fall off carriage bearing plate (14) when performing following step. h. Carriage bearing Install Use sling hoist. Depress locking pin and plate (14) position half way into inner mast then remove sling hoist i. Carriage bearing Move into full plate (14) position j. Two lift chains Connect ends to Para 2-56d carriage  bear- ing plate (14) k. Four tube assem- InstalI Para 2-56f(2) blies l. Four hose assem- Install Para 2-56f(2) blies m. Rotation bearing (13) Position On carriage bearing plate (14) n. 16 cap screws (12) Install 14 Side shifter a. Chain hoist Secure  to  side frame (11 ) shifter frame WARNING Be sure chain hoist is securely attached to side shifter frame be- fore performing following step. Failure to do so could cause se- rious bodily injury. b. Side shifter frame(11)   Position; align On rotation bearing (13) holes in side shifter frame with holes in rotation  bear- ing (13) 3-256