Hydragas unit testing (Suspension)

HYDRAGAS UNIT TESTING

Test 18G 703Q, 18G 1743

If the trim height is low and there is no detectable fluid leak from the hydragas system, a leakage of nitrogen from one or more of the hydragas units is indicated.

1. Depressurise and evacuate the hydragas unit on the low side of the car.

2. Disconnect the connecting pipe from the suspect hydragas unit and fit the tool 18G 1743 to the unit. Pressurise the hydragas unit using tool 18G 703Q and note the readings on the servicing unit pressure gauge.
3. The gauge readings should rise rapidly to 2172 kN/m² ± 3% (240 lbf/in² ± 20 lbf/in²), (this is the nominal nitrogen pressure) and then rise gradually at each operation of the servicing unit pump.
4. If the gauge reading continues to rise rapidly at each operation of the servicing unit pump after the nitrogen nominal pressure is reached, the unit is defective and must be renewed.
5. If a new Hydragas unit is fitted, or an existing Hydragas unit is refitted to the vehicle, the unit must be evacuated.
6. Adjust the pressure to give the correct trim height.