Hydraulic Pressure Test

HYDRAULIC PRESSURE TEST

An accurate tachometer and pressure test gauge are required. Test Gauge C-3293-SP has a 300 psi range and is used at all locations where pressures exceed 100 psi.


Pressure Test Port Location


NOTE: The AS68RC pressure port plugs are 1/2 x 20 UNF thread, with O-ring.










Only one line pressure port (2) is supplied on the transmission case.


A line pressure test is performed to check the performance of the oil pump, to check the functionality of the control valves, and to check parts for oil leakage.


LINE PRESSURES







TEST PROCEDURE






NOTE: The AS68RC utilizes closed loop control of pump line pressure. The pressure readings may therefore vary greatly but should always follow line pressure.

All pressure readings should be taken with the transmission fluid level full, transmission oil at the normal operating temperature. Check the transmission for proper operation in each gear position that is in question or if a specific element is in question.


WARNING: The line pressure test should be performed by two people. One person moves away from the vehicle and checks the condition of the tires and wheel chocks. The other person performs the test. Failure to follow these instruction may result in personal injury or may be fatal.

1. Fully apply the parking brake.
2. Apply wheel chocks.
3. Remove the line pressure sensing plug and install adapter fitting 100009-1 (1) and the oil pressure gauge C-3293SP (2).
4. Start the engine and allow it to warm up until the ATF reaches a temperature of 50 - 80� C (120 - 175� F).
5. Depress the brake pedal firmly. While holding down the brake pedal firmly shift into the D range, measure and record the oil pressure at idle.

WARNING: If the engine speed does not reach the stall level and the rear wheel start to turn, ease off the accelerator and stop the test. Failure to follow these instruction may result in personal injury or may be fatal.

6. Fully depress the accelerator pedal. Quickly measure and record the oil pressure at stall speed.

Take measurements in a similar manner for the R range.

7. Remove adapter fitting 100009 (1) and the oil pressure gauge C-3293SP (2).
8. Install the line pressure sensing plug and tighten to 27 Nm (20 ft.lbs.)

POSSIBLE CAUSES


NOTE: If the measured values do not conform to the standard values, locate the possible cause by referring to the following table and inspect the component.

Test Result: