---
publication_id: "OT-2026-000003100"
title: "Hydraulic leveling control system for a loader type vehicle"
published_at: "2026-09-15T19:28:59.621853Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000003100"
categories:
  - "lifting-positioning-manipulation/lift-tables-and-positioners"
keywords:
  - "b66f9/22"
  - "b66f9/22"
  - "b66f9/22"
  - "e02f3/43"
  - "e02f3/433"
  - "e02f3/433"
---

# Hydraulic leveling control system for a loader type vehicle

## Abstract

A hydraulic control system for controlling the orientation of a material handling unit on a lift boom. The control system includes a flow divider/combiner valve operative in a boom-raise, unit-leveling mode to pass a portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder, and operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. A modulating valve controls flow to and from the base end of the boom cylinder and is pilot actuated to inhibit descent of the boom until the pressure in the unit cylinder reaches a level at which the unit cylinder initiates levelling of the unit.

## 1. Drawings

[0001] Sheet 1.

[0002] Sheet 2.

[0003] Sheet 3.

[0004] Sheet 4.

[0005] Sheet 5.

[0006] Sheet 6.