{
  "abstract": "The present invention relates generally to hydraulic lift systems and, more specifically, to hydraulic pressure relief systems and methods on material handling vehicles. The hydraulic control system includes a pump having a pump outlet in fluid communication with a supply passage, a reservoir in fluid communication with a return passage, one or more hydraulic actuators configured to raise and lower a fork assembly attached to a mast of the material handling vehicle, a variable pressure relief valve configured to selectively provide fluid communication from the supply passage to the reservoir, and a controller in communication with the variable pressure relief valve and a pressure sensor configured to measure a pressure in the supply passage.",
  "assignees": [
    "RAYMOND CORP"
  ],
  "authors": [
    "SMITH ERIC A",
    "WEISS THOMAS R"
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  "published_at": "2026-09-15T19:05:59.925334Z",
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  "source_date": "2026-03-26",
  "source_id": "AU-2020223732-B2",
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  "supersedes": null,
  "title": "Variable hydraulic pressure relief systems and methods for a material handling device",
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