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(9) Return to shop or move vehicle off chassis dyno. AIR TESTING TRANSMISSION CLUTCH AND Air-pressure testing can be used to check transmis- sion front/rear clutch and band operation. The test Air-pressure testing requires that the oil pan and valve body be removed from the transmission. The Front Clutch Air Test Place one or two fingers on the clutch housing and apply air pressure through front clutch apply pas- Rear Clutch Air Test Place one or two fingers on the clutch housing and apply air pressure through rear clutch apply passage. Front Servo Apply Air Test Apply air pressure to the front servo apply pas- sage. The servo rod should extend and cause the PRESSURE TEST ANALYSIS CHART TEST CONDITION INDICATION Line pressure OK during Pump and regulator Line pressure OK in R Leakage in rear clutch Pressure low in D Fourth Overdrive clutch piston Pressure OK in 1, 2 but Leakage in front clutch Pressure OK in 2 but low Leakage in rear servo Front servo pressure low Leakage in servo; broken Pressure low in all Clogged filter, stuck Governor pressure too Governor pressure Governor pressure low at Faulty governor pressure Lubrication pressure low Clogged fluid cooler or Line pressure high Output shaft plugged, Line pressure low Sticky regulator valve, Fig. 8 Air Pressure Test Passages 1 – REAR SERVO APPLY 21 - 14 TRANSMISSION AND TRANSFER CASE WJ DIAGNOSIS AND TESTING (Continued) 2000 JEEP GRAND CHEROKEE |