TM-9-2320-361-24-2 Field Maintenance Manual Volume 2 for M44A2 Series Trucks
Page 78 of 1144
TM 9-2320-361-24-2 0206 00 0206 00-2 FRAME ALIGNMENT INSPECTION (Contd) NOTE • Any loose or missing cross member rivets, loose or broken crossmembers, or damaged frame rails must be repaired prior to inspection. • Ensure inspection procedure is performed on a flat level surface. FRAME LEVELING 1. Drive vehicle into inspection position from a 12 ft (3.7 m) straight line of travel. Apply parking brake and chock wheels (TM 9-2320-361-10). 2. Using tape measure, determine distance from floor (3) to bottom of front frame rails (1) in front of crossmember (4). If one frame rail (1) is lower, use hydraulic jack and raise one side of front axle to level frame rails (1) to within 1/8 in. (3 mm) of each other. 3. Using tape measure, determine distance from floor (3) to bottom of rear frame rails (1) at crossmember (2). If one frame rail (1) is lower, use hydraulic jack and raise one side of rear-rear axle to level frame rails (1) to within 1/8–5/16 in. (3-8 mm) of each other. HORIZONTAL BOW INSPECTION NOTE On vehicles with a frame longer than 20 ft (6 m), the front 20 ft (6 m) of frame rail (measured from front to rear) and the rear 20 ft (6 m) of frame rail (measured from rear to front) are measured separately. This will cause an overlap in measurement. Perform the following procedure for each 20 ft (6 m) section of left and right frame rail. 1. Tape one 8 x 10-1/2 in. (20x 27 cm) sheet of white paper to floor (3) under each end of frame crossmembers (5) and in front of crossmember (4) where attached to frame rails (1). 2. Tape one 8 x 10-1/2 in. (20x 27 cm) sheet of white paper to floor (3) under each front bogie bracket (6). NOTE Ensure plumb bob string is placed flat against frame rails free of obstructions such as bolts, rivets, brackets, and rear springs. Allow plumb bob to stop swinging before making mark on paper. 3. Hold string with plumb bob to outside of frame rails (1), above paper, and 4 in. (10 cm) up from bottom of frame rails (1). Accurately locate point of paper directly below plumb bob. 4. Carefully mark spot on each paper directly below plumb point.