ZF Transmission

1. Check the oil level.





2. Connect the pressure gauge.
- Connect pressure gauge 2531 to the door window. Screw adapter 5287 to the transmission and connect the hose to the adapter.
3. Start the engine and let it idle.
- Hold the brake pedal down during the test. Read the line pressure with the gear selector in positions "D" and "R".

Line pressure at idle (Measured in outlet as shown in figure)
Gear position D: 0.6-0.76 MPa (85-108 psi)
Gear position R: 1.1-1.4 MPa (156-199 psi)

Abnormal results:
Line pressure too high
- Is the throttle cable correctly adjusted?
No! - Adjust it.
Yes! - Check the following:
Primary regulator valve - Rev up the engine. If the pressure varies in proportion to the engine speed, the valve has seized. Dismantle the valve body.
Throttle valve - Let the engine idle in position N. Pull out the throttle valve by hand (without moving the throttle). If the line pressure does not increase, the throttle valve is sticking. Dismantle the transmission.
Line pressure too low may be due to a sticking primary or throttle valve. Test according to "line pressure too high". If the test shows that none of the valves is sticking, the low pressure is probably due to a defective oil pump (the pump is then usually noisy). Alternatively, the only problem may be a clogged oil strainer or defective accumulator pistons.