TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download

PAR 233 TEST AND ADJUSTMENTS CHAP 5, SEC XXXIV - Using a 9/16-inch wrench, re- move six cap screws 24 and lock washers 25. - Remove saddle cap 28. Re- move coupling nut 80 (fig. 381, fold-out 10) and remove coupling retainer 79. - Disengage shaft 39 (fig. 386, fold-out 15) by sliding it toward the out- put drive assembly. - Reinstall the retainer and nut. Tighten the nut and install cap 28, wash- ers 25 and cap screws 24. Tighten bolts to 33-40 pound-feet. (2) Disengage the left-output drive assembly (fig. 385, fold-out 14). The left-output assembly is disengaged in the same manner as described for the right side in (1), above. b. Warm Up — (1) Check the transmission oil level (fig. 366). Add oil as required to ob- tain the correct oil level for a safe start. (2) Start the engine (or test stand motor) and shift the transmission into 4th gear. Apply the brakes, and allow the transmission to operate at an input speed of 1200 to 1500 rpm for 3 to 8 minutes, until normal operating temperature (ap- proximately 220 degrees F) is reached. (3) Shift through all ranges se- veral times to insure that the hydraulic system is fully charged. Reduce the input speed to make shifts from a forward range to a reverse range, or from reverse range to a forward range. (4) Shift the transmission to neutral range, apply the brakes, and in- crease the input speed to 1200-1500 rpm and maintain for three minutes. stop engine, wait twenty minutes, then check the transmission oil level. Add or drain the oil until oil level is at the top of the OPERATING RANGE marking on the indicator (fig. 366). c. Leak Check. During the warm-up period, inspect the transmission for oil leaks at split lines and around bolts and plugs. If leakage is present, check bolts and plugs for tightness. If leakage con- tinues, replace gaskets where required. Leakage of oil, in many cases, can cause faulty operation of the transmission. d. Oil Pressures. All necessary oil pressure tests can be made during the functional tests outlined in e , below, and in fig. 367. Fig. 368 illustrates and iden- tifies the transmission oil pressure check points. e. Functional Tests — (1) The test data log sheet (fig. 367) can be used as a guide for making the proper tests, as well as providing spaces to record actual tests results. In addition, the normal pressures are included for com- parison with test results. (2) In all tests, the transmission oil must be at normal operating tempera- ture (approximately 220 degrees F). Con- nect the pressure gage to the check point indicated, for the test being made (fig. 369). (3) Reduce the speed of the transmission input to engine idle speed before engaging the desired range. Then slowly increase the speed to the desired input speed. Record the readings for each test. (4) Do not attempt to remove or install gages while the transmission is operating. Reinstall plugs immediately upon removing the gage. (5) When making the tests for steer clutch pressure, move the steer con- trol from Center to Full steer slowly while observing the pressure rise. It should rise to maximum as the control is moved fully to steer position. (6) In tests for lockup engage- ment, increase speed slowly until lockup apply pressure registers. Record lockup pressure and input speed. Record gover- nor pressure at lockup engagement (full TV). Change 2 197