18G 703V Hydragas Unit Valve Setting (Front suspension)

18G 703V Hydragas Unit Valve Setting

O = Valve Open - = Valve closed

TO ADJUST Remove underbonnet closing panel. See BODY, Exterior fittings.

Fit connector of tool 18G 703V to displacer valve with the connector T-bar valve unscrewed. Any air which may have entered the tube during this operation should be carefully bled out by opening the bleed valve in the connector body and slowly pumping then close the bleed valve.

Ensure the service tool is¹/₄ full of hydralastic fluid before use.

Close valves ’A’,’B’ and ’C’. Open valves ’D’ and ’E’. Operate the pump until approx 100 psi is registered on the gauge. screw in connector T-bar, and read pressure of displacer on gauge. Check trim height and adjust by increasing the fluid pressure to raise, or lower by slowly opening valve ’A’ and reducing pressure until the correct pressure or trim height is reached.

When pressure check is completed, unscrew the connector T-bar and release pressure in unit by opening valve ’A’, before removing connector from displacer. Fit underbonnet closing panel. See BODY, Exterior fittings.

NOTE: Temperature will affect the suspension height. Trim height specification is correct at a nominal temperature of 17°C. Setting trim heights at temperatures above or below 17°C will cause the suspension trim height to be incorrect and should be compensated for, by the factor of 0.6 mm per 1°C, When temperatures are above or below this figure.

TO DEPRESSURISE OR DRAIN - Close valves ’A’,’B’ and ’C’. Open valves ’D’ and ’E’. slowly open valve ’A’ until pressure reads zero and movement of fluid in tube has stopped.

TO EVACUATE - Open valves ’A’,’B’ and ’C’ . Close valves ’D’ and ’E’. Ensure the tubular pump is in the evacuation position, i.e. Turn pump handle anti-clockwise, lift and turn clockwise again to lock.

Operate pump slowly until 27 inches Hg is obtained and movement of fluid in the tube has stopped.

TO FILL DISPLACERS - Close valves ’A’ and ’D’. Open valves ’B’,’C’ and ’E’. Slowly open valve ’E’ and wait until vacuum gauge has settled at zero.

TO PRESSURISE - Close valves ’A’,’B’ and ’C’. Open valves ’D’ and ’E’. Lower pump handle to pressurising position and pump to required pressure or trim height.

The vehicle should periodically bounced while pumping up to settle the displacer valves and avoid excessive pressure.

Drive the vehicle for a minimum of 2 miles to settle the suspension before resetting the trim height.