TM10-3930-660-20 (2) Do not pull bearings or bushings unless damaged. If you must get at parts behind them, pull out bearings or bushings carefully. (3) Replace all gaskets, seals, and preformed packings. 3-4. CLEANING  INSTRUCTIONS a. General. (1) (2) The cleaning instructions will be the same for the majority of parts and components that make up the 6KVRRTFL. The importance of cleaning must be thoroughly understood by maintenance personnel. Great care and effort are required in cleaning. Dirt and foreign  material  are  a  constant  threat  to  satisfactory  maintenance.  The following should apply to all cleaning, inspection, repair and assembly operations. (a) Clean all parts before inspection, after repair and before assembly. (b) Hands should be kept free of any accumulation of grease, which can Collect dust, dirt or grit. (c) After cleaning, all parts should be covered or wrapped to protect them from  dust  and  dirt. Parts that are subject to rust should be lightly oiled. (3) Observe the following precautions during all cleaning  operations: WARNING P-D-680 (Type II) is a flammable solvent that is potentially  dangerous  to  personnel.  Keep  away  from heat, sparks or open flame. Flash point of solvent is 138°F  (59°C). Use only in a well ventilated area. Inhaling vapors over a period of time can cause headache and drowsiness. Use gloves to prevent irritation or inflammation of the skin. Solvent absorbed through the skin can result in internal disorders. If contact occurs, wash the affected area with water for 15 minutes. For eyes, flush with water and then seek immediate medical attention. WARNING Improper cleaning methods and use of unauthorized cleaning solvents may injure personnel and damage equipment. Refer to TM9-247 for correct information. 3-2