Control system for front end loader boom and bucket operating sy

Details Control system for front end loader boom and bucket operating sy Control system for front end loader boom and bucket operating sy

1987-07-13

1988-10-25

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

60468, 60484, 60486, 91461, F16D 3102, F15B 1302

Patent

active

047794160

ABSTRACT:
A control system for the boom and bucket operation system on a front end loader that includes an unloader valve responsive to pilot valve pressure to bypass hydraulic fluid pumped by an auxiliary pump to the reservoir while maintaining the primary pump supply to a loader valve which supplies pressure to the boom and bucket cylinders in response to the operation of pilot valves. The unloader valve bypasses the auxiliary pump flow when the pressure is below a predetermined value and when the pressure is above a second higher predetermined value.

REFERENCES:
patent: 3952510 (1976-04-01), Peterson
patent: 4113054 (1978-09-01), Myers
patent: 4141280 (1979-02-01), Lorimar
patent: 4509406 (1985-04-01), Melocik

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