Hydraulic Pressure Test

PRESSURE TEST PROCEDURE
1. Connect pressure test gauge to test port on passenger side of transmission. Use Adapter 7554 to connect gauge. Be sure test gauge has minimum capacity of 300 psi (2100 kPa).

2. Be sure transmission fluid is at normal operating temperature.

3. Apply parking brakes and block wheels.

WARNING: DO NOT ALLOW ANYONE TO STAND AT THE FRONT OR REAR OF THE VEHICLE WHILE PERFORMING THE FOLLOWING STEPS IN THE PRESSURE TEST.


4. Check and adjust engine curb idle speed.

5. Apply service brakes.

6. Shift transmission into D range and note line pressure with engine at curb idle speed. Pressure should be 61-to-70 psi (421-to-481 kPa).

7. Press accelerator pedal to wide open throttle position and note line pressure. Pressure should be 173-to-209 psi (1196-to-1442 kPa).

CAUTION: Do not maintain wide open throttle for more than three or four seconds at a time.

8. Shift transmission into Reverse and note line pressure with engine at curb idle speed. Pressure should be 75-to-9O psi (519-to-618 kPa).

9. Press accelerator to wide open throttle position and note line pressure in Reverse. Pressure should be 213-to-263 psi (1471-to-1814 kPa).

CAUTION: Do not maintain wide open throttle for more than three or four seconds at a time.

10. If line pressure is not within specifications, adjust line pressure cable and repeat pressure test.


PRESSURE TEST ANALYSIS
If pressures in D and Reverse are higher than specified, check for the following:

- line pressure cable loose, worn, binding or out of adjustment

- throttle valve, downshift plug, throttle cam, or primary regulator valve are sticking, worn or damaged

If pressures in D and Reverse are lower than specified, check for following:

- line pressure cable loose, worn, binding or out of adjustment

- throttle valve, downshift plug, throttle cam sticking, worn or

- damaged

- primary regulator valve sticking, worn, or damaged

- oil pump gears or housing worn or damaged

- overdrive clutch worn or damaged

- If pressures are low in D - range only, check for following:

- forward clutch worn or damaged

- fluid leakage in D range circuit (component seal and 0-rings)

- If pressures are low in Reverse only, check for following:

- shift linkage (and manual valve) out of adjustment

- fluid leakage in reverse circuit (component seal and 0-rings)

- direct clutch worn or damaged

- first/reverse brake worn or damaged