Contents: Preparation ↡ Examination ↡
Preparation
Checking the hydraulic pump
3 — Air suspension control unit
3p - Drain plug on the control unit
S2 - Test setup
1. Disconnect the return line (T) from the tank (2).
2. Connect a return tube to one end of the return line and place the other end in a measuring tank.
3. Start the engine and set it to idle speed.
4. Check the pump flow. Pump flow is 0.2 l/min.
5. Turn off the engine.
6. Connect the return pipe (T) to the tank (2).
7. Drain the fluid from the system.
Examination
1. Connect the tester to the control unit (3).
2. Fill the tank (2) with liquid.
3. Start the engine and set it to idle speed.
4. Set the lever (3a) of the control unit to the "filling" position - F.
5. Check the pump discharge pressure. Since the pressure is significant, perform the test briefly. The bypass valve of the control unit limits the pump discharge pressure. The bypass valve makes a whistle when opening. If the opening pressure of the bypass valve is lower than required, replace the pump. If the opening pressure of the bypass valve is higher, check the rear suspension control unit. The opening pressure of the bypass valve is 120-153 bar.