TM 10-3930-669-20 (6) Remove   knob   (28)   from   tilt/lift   joystick   lever (24). (7) Remove boot (29) from tilt/lift joystick lever (29) and tilt/lift joystick (15). c.  Cleaning/Inspection. WARNING · Drycleaning solvent (P-D-680) is TOXIC and flammable.  Wear protective goggles and gloves; use only in a well-ventilated area; avoid contact with skin, eyes, and clothes; and do not breathe vapors.  Keep away from heat or flame.  Never smoke when using solvent; the flashpoint for type I drycleaning solvent is 100°F (38°C) and for type II is 138°F (50°C).  Failure to do so may result in injury or death to personnel. · If personnel become dizzy while using cleaning solvent, immediately get fresh air and medical help.  If solvent contacts skin or clothes, flush with cold water.  If solvent contacts eyes, immediately flush eyes with water and get immediate medical attention. (1) Clean all metal parts with drycleaning solvent and wipe dry with wiping rags. (2) Do not allow drycleaning solvent to come in contact with rubber boot. (3) Inspect all parts for breaks, cracks, burrs, and sharp edges. (4) Replace all damaged parts. 17-15