4-29. Shaft Bearing and Seal Service

TM 5-2590-512-13&P SECTION V. UNIT MAINTENANCE PROCEDURE 4-29. Shaft Bearing and Seal Service. This task covers: a. Service Initial Setup Tools: Equipment Conditions: General Mechanic's Tool Kit Output shaft removed (see para. 4-26) 5180-00-177-7033 Materials and Parts: GAA Grease, P-D-680 Dry Cleaning Solvent. Rags. a. Service. 1. Insert drift (1) into hub (2) thru top hub opening and gently tap out (on metal exposed part) lower seal (3). Remove lower bearing cup (4) with lower bearing cone (5). NOTE Leave upper bearing cone and cup and seal in place. 2. Carefully inspect the drive shaft (6) and the inside of the hub (2) for any cracks, breaks, bends, visible wear, or general defects. Rotate bearings to check for rough spots or symptoms that bearings need replacement. Replace any defective parts. WARNING Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles, face mask, and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes, and don't breathe vapor. Do not use near open flame or excessive heat. The flashpoint for Type I dry cleaning solvent is 1000F (380C) and for Type II is 1400F. (600C). If you become dizzy while using cleaning solvent, get fresh air immediately and get medical aid. If contact with eyes is made, flush eyes with water and get medical aid immediately. 3. Wipe excess grease from inside hub (2) with clean rags. Clean bearings one at a time with solvent and immediately apply grease. Rotate bearing as you work grease into cone and cup surfaces. 4. Install lower bearing cup (4) and lower bearing cone (5) in hub (2). 5. Use cylinder shape tool on lower seal (3) surface to apply uniform force and tap seal in place in hub (2). FOLLOW ON TASKS Install Output Shaft (para 4-26). END OF TASK 4-30