Ride Levelling System Operation - Page 7

Ride Levelling System Operation

The operation of the power hydraulic system can be divided into the following functions:
Trim up compensation. Trim down compensation.

Trim Up Compensation (ENGINE RUNNING ONLY)

The ride height sensor energises a relay after a 20 second period of it detecting a car low condition. The relay in turn energizes the solenoids of both the unloader and suspension-up valves prevents oil flow to the reservoir and thus forces the fluid into the struts.

Trim Down Compensation

The ride height sensor actuates the solenoid of the suspension-down valve after a 20 second period of it detecting a car high condition. With the suspension-down valve open, mineral oil within the rear damper/struts is vented back into the systems reservoir, the struts retract to the correct trim height. A minimum pressure of 27 bar (400 lb./sq.in.) is maintained by the trapped line pressure valve.