TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download
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TM 9-2320-387-24-2 32-4. FRAME INSPECTION AND REPAIR (Cont’d) (b) Horizontal (bowing) measurement. 1 (1) (2) (3) (4) (5) (6) (7) Select a smooth, level surface and drive vehicle into position from a 12 fi (3.7 m>straight line of travel. Apply parking brake gently to bring vehicle to a stop. Chock wheels (TM 9-2320- 387-10) and release parking brake. Measure height of frame rails (3) and (6) at each end near center of crossmembers (21 and (4). If heights vary by more than L/8-5/16 in. (3-B mm>,raise and install jackstands to bring frame to leveling tolerance &.ep 2a (11 and (21). Hold a string with plumb bob (71, as shown, along frame rail (61 at intersection of crossmember (2). Mark location (8) where plumb bob (7) stops moving. Repeat for other three comers of frame. NOTE l Strings used for horizontal bow measurement will remain in place until procedure 2(c), frame skew, is completed. l “lb ensure measurements are precise, string must be pulled tight and secured. Stretch string tightly on ground (5) between front and rear plumb bob (71 marks under each frame rail (3) and (6). Measure front (2) and rearmost (4) crossmembers to determine center point. Drop a plumb bob (71 from these points to the ground. Mark location where plumb bob (7) stops moving. Stretch string tightly on ground (5) between front and rear plumb bob (7) marks under crossmembers (2) and (4) to determine centerline (1). Measure an equal distance (D) along right and left strings to select your measure points and measure from these right and left points to center string. Mark these points on string. The distance from right and left points to center string should be within l/4 in. (6 mm) of being equal. If not, one frame rail is bowed. Repeat this procedure for several other points along frame. Record deviations. M~+l/4 in. (6 mm) 32-6