TM 10-3930-664-24 13.  REMOVE ROLLERS (90, 94) AND ROLLERTM 10- 3930-664-24 GUIDES (96). a. Remove   drive   chain   rollers   (90)   from   top      of intermediate  rail  (91)  by removing screws (92) and roller pins (93). b. Remove  four  rollers  (94)  and  shims  (95)  from intermediate rail (91). c. Remove   mainlift   hose   roller   guides   (96)   from bottom   of   intermediate   rail   (91)   by   removing bolts (97) and washers (98, 99). B. CLEANING Clean mast assembly components in accordance with paragraph 1-24. C. INSPECTION a. Inspect  mast  assembly  components  in  accordance with paragraph 1-24. b. Inspect  wear  pads  (53,  65,  67,  71)  for  uneven  or excessive wear.  Check for small semi-circle on face of pad.  If semi-circle has worn away, replace pad. D. REPAIR Repair of the mast assembly consists of removal and replacement of defective, deformed, or damaged components and worn pads. E. ASSEMBLY 1. INSTALL ROLLERS (90 94) AND ROLLER GUIDES (96). a. Install mainlift hose roller guides (96) onto bottom of intermediate rail (91) using bolts (97) and washers (98, 99). b. Install four rollers (94) and shims (95) onto intermediate rail (91). c. Install drive chain rollers (90) onto top of intermediate rail (91) using screws (92) and roller pins (93). 4-113