TM  10-3930-638-24&P 3-31.   MAST   ASSEMBLY   MAINTENANCE   (cont) b. Side Shifter Frame and Rotation Bearing (cont). STEP LOCATION ITEM ACTION REMARKS CLEANING  (cont) 7 (cont) INSPECTION/REPAIR 8 9 10 11 12 NOTE Don’t  immerse  roller  bearings  (15  and (13) in cleaning solvent. Lower  pivot  mast  pin Inspect (5) Roller bearings (15 and Inspect 18) and cam roller (20) Side  shifter  frame  (11) Inspect and carriage bearing plate (14) Rotation bearing (13) Inspect All other parts Inspect INSTALLATION/REPLACEMENT 13 Carriage bear-               a. ing  plate  (14) b. c. d. e. f. g. Two cam rollers (20) Install Shims (19) Install Four roller bearings (18) Install Two cap screws (17) Install Shims (16) Install Two  roller  bearings  (15)  Install Sling hoist Secure to 18)  or  rotation  bearing carriage  bear- ing plate (14) Replace  if  bent  or  distorted,  threads  dam- aged,  or  worn Replace if out of round, scored, burred, sharp  edged,  or  worn Replace or repair by welding if cracked, broken, or structurally damaged. Replace if bent or warped Replace if out of round, scored, burred, worn, or distorted. Repair damaged threads  by  chasing  with  5/8-11  UNC 2B tap Replace if damaged, worn, cracked, or distorted On two bottom roller bearings 3-255