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The process of elimination can be used to detect any unit which slips and to confirm proper operation DIAGNOSIS AND TESTING - HYDRAULIC Pressure testing is a very important step in the diagnostic procedure. These tests usually reveal the Before performing pressure tests, be certain that fluid level and condition, and shift cable adjustments Install an engine tachometer, raise vehicle on hoist which allows front wheels to turn, and position Attach 300 psi gauge (C-3293SP) to port(s) required for test(s) being conducted. Use adapter set Test port locations are shown in (Fig. 4). TEST ONE-SELECTOR IN LOW (1st GEAR) (1) Attach pressure gauge to the low/reverse clutch tap. (2) Move selector lever to the (L) position. throttle opening to achieve an indicated vehicle speed (4) Low/reverse clutch pressure should read 115 to 145 psi. (5) This test checks pump output, pressure regula- tion and condition of the low/reverse clutch hydraulic TEST TWO-SELECTOR IN DRIVE (2nd GEAR) NOTE: This test checks the underdrive clutch (1) Attach gauge to the underdrive clutch tap. throttle opening to achieve an indicated vehicle speed (4) In second gear the underdrive clutch pressure should read 110 to 145 psi. TEST TWO A–SELECTOR IN OD (4th Gear) NOTE: This test checks the underdrive clutch (1) Attach gauge to the underdrive clutch tap. throttle opening to achieve an indicated speed of 40 (4) Underdrive clutch pressure should read below 5 psi. If not, then either the solenoid assembly or TEST THREE-OVERDRIVE CLUTCH CHECK (3rd and (1) Attach gauge to the overdrive clutch tap. throttle opening to achieve an indicated vehicle speed (4) Overdrive clutch pressure should read 74 to 95 psi. (5) Move selector lever to the (3) position and increase indicated vehicle speed to 30 mph. (6) The vehicle should be in second gear and over- drive clutch pressure should be less than 5 psi. (7) This test checks the overdrive clutch hydraulic circuit as well as the shift schedule. TEST FOUR-SELECTOR IN OVERDRIVE (4th Gear) (1) Attach gauge to the 2/4 clutch tap. throttle opening to achieve an indicated vehicle speed (4) The 2/4 clutch pressure should read 75 to 95 psi. (5) This test checks the 2/4 clutch hydraulic cir- cuit. Fig. 4 Pressure Taps 1 - OVERDRIVE CLUTCH RS 41TE AUTOMATIC TRANSAXLE 21 - 273 41TE AUTOMATIC TRANSAXLE (Continued) |