An emergency hydraulic system for use in a vehicle having an engine which not only powers the vehicle but also drives a main hydraulic pump to supply hydraulic fluid under pressure to a hydraulic control means is disclosed. The emergency hydraulic system includes an auxiliary hydraulic pump driven by an electric motor to provide an auxiliary source of hydraulic fluid under pressure to the hydraulic control means under emergency conditions. An electrical control circuit for the electric motor is described which control circuit will automatically activate ...
In a vehicle having an engine, hydraulic control means actuated by hydraulic fluid under pressure, a main hydraulic pump driven by said engine to provide hydraulic fluid under pressure for actuating said control means, and an auxiliary hydraulic pump driven by an electric motor to provide hydraulic fluid under pressure for actuating said control means; an electrical control circuit for said electric motor comprising: a. a source of electrical power; b. a first solenoid operated relay having normally open contacts connected in series with said electric mo...
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