Hydraulic Test
1. PREPARATIONa. Warm up the transmission fluid.
b. Remove the transmission case test plug and mount the hydraulic pressure gauge.
SST 09992 - 00094 Oil pressure gauge
CAUTION: Perform the test at normal operating fluid temperature (50 - 80 °C or 122 - 176 °F).
2. MEASURE LINE PRESSURE
a. Fully apply the parking brake and chock the four wheels.
b. Start the engine and check the idling rpm.
c. Shift into D range1 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 to specified values, recheck the throttle cable adjustment and retest.
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 clutch defective
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
3. (140 L) MEASURE GOVERNOR PRESSURE
a. Check the parking brake to see that it is not applied.
b. Start the engine.
c. Shift into D range and measure the governor pressures at the speeds specified in the table.
EVALUATION
If governor pressure is defective:
- Line pressure defective
- Fluid leakage in governor pressure circuit
- Governor valve operation defective