Tord Samdal from Norway has made a wonderful animation of the hydraulic system of the Silver Shadow. He presents this animation on his site called The Rolls-Royce Silver Shadow Hydraulic System. I thank him for his permission to offer you this unique animation on this site too.
This animation is built-up based on the hydraulic diagram of chassisnumber 7404 until 22072, so on the Silver Shadows without height control on the front wheels and with master cylinder. Look at the relevant page about this diagram.
How does the animation work
a. Building-up pressure
The animation starts functioning when clicking on the button "Start engine" in the upper left corner of the animation:  . At first the hydraulic pumps build-up pressure in the accumulators until 2500 lb/sq.in:  . When that is completed the brake system as well as the height control system are available.
b. Height control
When the gear lever is positioned in "P/N"  , the car stands still. P/N = Park/Neutral. When the car stands still the doors can be "open" or "closed"  . In both cases the solenoid  is stand-by to control fast leveling. This solenoid-operation by the door switch is deleted in 1972.
When there is some weight put into the boot ("Boot load")  (or when passengers enter the car) the Ram valves can start their job, as can be seen in the upper right corner of the animation.
When the gear lever is positioned in "D/R"  , the car drives. D/R = Drive/Reverse, forwards resp backwards. When the car drives, the solenoid is cut out, unless one drives with doors opened. When the solenoid is cut out, one drives in "Slow leveling".
Once again all change in weight will be managed by the Ram valves.
c. Brake system
When the car drives (but also when it stands still) one can activate the brakes ("Brake pedal pressure")  . The animation shows the case of "Soft" braking and "Hard" braking. On soft braking all three brake systems function, including the master cylinder. On hard braking in the animation the brake pressure limiting valve  is activated which prevents the rear brakes from locking up.
d. Decreasing pressure
When one wants to maintain the system at first the pressure must be brought to zero. That is possible by repeating the stepping on the brake pedal at least some 50 times, of course only when the engine is stopped. The animation can simulate this by stepping on the brake pedal 30 times at once:  . After 30 times the pressure in the second system has decreased to 700 lb/sq.in:  . After 60 times of stepping on the pedal in this case the pressure has reduced to about 400 lb/sq.in and the red warning lamps on the dashboard have started to burn:  . A red lamp on the dashboard means that the pressure in the system is too low. After starting the engine the system pressure must increase and the lamps are off again.
Download of the animation
When you go to the site of Tord Samdal, you can download the original. When you install that on your computer, the animation is provided with a pretty "click"sound of the gear shift lever. The disadvantage of that is that the program is installed in directories that you perhaps wouldn't have made yourself. Therefore you can download the animation from this site and store it in the directory you choose yourself. In that case you miss the beautiful "clicks". The download starts by clicking on the next button.
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Marinus Rijkers. Disclaimer
