Hydraulic Test

HYDRAULIC TEST






1. PREPARATION.
a. Warm up the transmission fluid.
b. Chock the rear wheels.
c. Jack up the vehicle and support it on stands.
d. Remove the transmission case test plugs and mount hydraulic pressure gauges.

Special Service Tool: 09992-00094 Oil pressure gauge.

CAUTION:
- Perform the test at normal operating fluid temperature (50 - 80°C or 122 - 176°F).
- Measurement can be made with 800 or 1,000 rpm test, but if tests are to be made at 1,600 or 1,800 and 2,400 or 3,500 rpm, it would be safer to test on a road or chassis dynamometer because an on-stand test could be hazardous.

2. MEASURE GOVERNOR PRESSURE (A131L).
a. Check the parking brake is applied.
b. Start the engine.






c. Shift into D range and measure the governor pressures at the speeds specified in the table.

2A. EVALUATION.
If governor pressure is defective:
- Line pressure defective
- Fluid leakage in governor pressure circuit
- Governor valve operation defective.






3. MEASURE LINE PRESSURE.
a. Fully apply the parking brake and chock the four wheels.
b. Start the engine and shift into D range.
c. Step down strongly on the brake pedal with your left foot and while manipulating the accelerator pedal with the right foot, measure the line pressure at the engine speeds specified in table.
d. In the same manner, perform the test in R range.






e. If the measured pressures are not up specified values, recheck the throttle cable adjustment and retest.

2A. EVALUATION.
a. If the measured values at all ranges are higher than specified:
- Throttle cable out-of-adjustment.
- Throttle valve defective.
- Regulator valve defective.

b. If the measured values at all ranges are lower than specified:
- Throttle cable out-of-adjustment
- Throttle valve defective.
- Regulator valve defective.
- Oil pump defective.
- OD brake defective (A240E).

c. If pressure is low in D range only:
- D range circuit fluid leakage.
- Forward clutch defective.

d. If pressure is low in R range only:
- R range circuit fluid leakage.
- First and reverse brake defective.
- Direct clutch defective.