TM 10-3930-659-20 13-2. ENGINE COMPARTMENT STEP MAINTENANCE. b. DISASSEMBLY 1. Remove two nuts (7), washers (6), screws (12), washers  (11),  spacers  (9),  and  tread  (10)  from tread (8). 2. Remove     two     cables     (5)     from     tread     (8). c. CLEANING AND INSPECTION WARNING Dry  cleaning  solvent,  P-D-680,  is  toxic  and  flammable.    Always wear   protective   goggles   and   gloves,   and   use   only   In   a   well- ventilated area.  Avoid contact with skin, eyes, and clothes, and DO NOT  breathe  vapors.    DO  NOT  use  near  open  flame  or  excessive heat.  The solvent's flash point is 100°F-138°F (380C-590C).  If you become dizzy while using cleaning solvent, Immediately get fresh air  and  medical  help.  If  solvent  contacts  eyes,  Immediately  wash your eyes and get medical aid. 1. Clean all parts with dry cleaning solvent and dry with clean rags. 2. Inspect two cables for fraying and damage.  Replace if frayed or damaged. 3. Inspect all parts for damage.  Replace damaged parts. d. ASSEMBLY 1. Position two cables (5) in tread (8). 2. Install tread (10) and two spacers (9) on tread (8) with two washers (11), screws (12), washers (6), and nuts (7). TA706753 13-4