These all drew power from an engine driven pump and hydraulic accumulator.
2.
The hydraulic control system consists of a valve arrangement and an engine driven pump.
3.
An engine driven pump supplies air into the exhaust to complete the burn of these chemicals.
4.
In these systems an engine driven pump pressurizes fuel at up to, in a " common rail ".
5.
In 1924, the current AC electrically operated water pump was installed replacing the 1913 DC generator & pump that itself replaced the original town gas four-cylinder Crossley combustion engine driven pump, and in 1998 the main braking wheel was replaced for the first time, together with the installation of a new hydraulic braking system to complement the original band braking / driving system.
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