TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 439 of 1205
TM 9-2320-387-24-l REFERENCE INFORMATION TRANSMISSION SYSTEM Procedure for checkina transmission fluid flUTUBE DIPSTICK 1. Start engine. 2. Hold down brake pedal and move transmission shift lever through all ranges including reverse. Leave the lever in each range for 2 seconds. 3. Engage parking brake and place shit lever in neutral. Check fluid level on dipstick. 4. Proper level is between FULL and ADD marks on dipstick NOTE Check fluid for a burnt smell, grit, discoloration, air bubbles, or a milky appearance. l Burnt smell, discoloration, or grit indicates worn or damaged internal components. Notify DS maintenance (chapter 14). l Bubbles indicate an overfilled system or air leaks in the system. Drain the fluid and refill to proper level (para. 5-2). l Milky appearance is due to water in the system. Change the fluid and filter (para. 5-2). l Check fill tube for indications of fluid being blown out. If fluid is being blown out, check vent line for obstructions, and refill transmission to proper level (para. 5-2). MARKINGS Jload Test Procedure u 1. Position shift lever in 0 (overdrive) and accelerate vehicle from 0 mph. A l-2.2-3. and 3-4 shift should occur at all i throttle openings. Allow vehicle to coast down to about 0 mph; 4-3.3-2, and 2-1 shifts should occur. 2. Position transmission shii lever in D (drive) and accelerate vehicle from 0 mph. A l-2 and 2-3 shift should occur at all throttle openings. Allow vehicle to coast down to about 0 mph; 3-2 and 2-l shifts should occur. 3. Position transmission shi lever in 2 (low two) and accelerate vehicle from 0 mph. A l-2 shift should occur at all throttle openings. No 2-3 shitt can be obtained in this range. A l-2 shift in 2 is somewhat firmer than in D. This is normal. 4. Position shift lever in 1 and accelerate the vehicle from 0 mph. No upshifts should occur in this range. 5. Position shift lever in 8, and with the vehicle speed at approximately 45 mph, close throttle and move lever to 3. Transmission should downshift to 3rd gear. An increase in engine rpm and engine braking effect should be noticed. 6. Position shift lever in @, and with the vehicle speed at approximately 35 mph, close throttle and move lever to 2. Transmission should downshift to 2nd gear. An increase in engine rpm and engine braking effect shordd be noticed. 7. Position shift lever 2 and, with the vehicle speed at approximately 25 mph, close the throttle and move lever to 1. Transmission should downshift to 1st gear. An increase in engine rpm and engine braking effect should be noticed. 6. Position shift lever in R and check for reverse operation. 9. Hard shifting may be indicative of an under-filled or clogged system. i The TP sensor is used to shift the transmission to a lower gear under heavy acceleration. 2-387