Backhoe hydraulic system

Details Backhoe hydraulic system Backhoe hydraulic system

2008-09-03

2009-08-11

Pezzuto, Robert E (Department: 3671)

Excavating

Ditcher

Condition responsive

C060S421000

Reexamination Certificate

active

07571558

ABSTRACT:
A pilot pressure control valve V17is provided that is switchable between an operation position56where pilot pressure is supplied to a first channel switching valve V12and a non-operation position57where pilot pressure is not supplied to the first channel switching valve V12; this pilot pressure control valve V17is switched to the non-operation position57during a state of non-travel and is switched to the operation position56with a pilot pressure established in a travel detection circuit54, and in the operation position56, supplies a pilot source pressure to the first channel switching valve V12from a fourth pump P4on the upstream side of a pressurized oil introduction orifice53.

REFERENCES:
patent: 6029445 (2000-02-01), Lech
patent: 6173573 (2001-01-01), Kamada
patent: 6502499 (2003-01-01), Sannomiya et al.
patent: 6584770 (2003-07-01), Tsuruga et al.
patent: 7069674 (2006-07-01), Arii
patent: 7412826 (2008-08-01), Horii
patent: 2006-161510 (2006-06-01), None

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