---
publication_id: "OT-2026-000001929"
title: "Oil circuit system, lifting device, electric jack, press, crane, and tire mounting/dismounting and transport apparatus"
published_at: "2026-09-15T19:09:35.077853Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000001929"
categories:
  - "lifting-positioning-manipulation/lift-tables-and-positioners"
keywords:
  - "b66f5/04"
  - "b66f5/04"
  - "b66f5/04"
  - "b30b1/007"
  - "b60b29/001"
  - "b60b29/002"
---

# Oil circuit system, lifting device, electric jack, press, crane, and tire mounting/dismounting and transport apparatus

## Abstract

The disclosure discloses an oil circuit system, a lifting device, an electric jack, a press, a crane, and a tire mounting/dismounting and transport apparatus. The oil circuit system comprises a lifting oil cylinder, the tank, the first oil feed line, the second oil feed line, the oil inlet/outlet line, the pressure relief line, the oil return line, the first valve, the second valve; the first oil feed line is the gear pump assembly oil feed line; and the second oil feed line is the plunger pump assembly oil feed line. Under no-load or low-pressure conditions of the lifting device, the gear pump assembly can quickly pump a larger volume of low-pressure hydraulic oil, enabling quick lifting or lowering of the lifting device. Under high-pressure conditions, the plunger pump assembly can quickly pump higher pressure hydraulic oil to the lifting oil cylinder to enable slow lifting or lowering.