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Dual-pump, flow-isolated hydraulic circuit for an agricultural tractor

  • US 5,918,558 A
  • Filed: 12/01/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 12/01/1997
  • Status: Expired due to Term
First Claim
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1. A hydraulic circuit for an agricultural tractor including:

  • a valve assembly having a manifold block with first and second valves fitted therein;

    and wherein the manifold block further includes;

    a first feed path connected to the first valve and a second feed path flow-isolated from the first feed path and connected to the second valve;

    a first return path connected to the first valve and a second return path flow-isolated from the first return path and connected to the second valve;

    and wherein the circuit further includes;

    a first pump flowing fluid to the first feed path; and

    a second pump flowing fluid to the second feed path;

    and wherein;

    the first pump is a fixed displacement pump and the second pump is a variable displacement pump; and

    the second pump has an inlet and the first and second return paths are connected to the inlet through a common return line.

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