Table of Contents

1. Introduction of hydraulic system of slewing mechanism of truck crane

Truck cranes, marvels of engineering, owe their operational flexibility to the intricate slewing mechanism. This mechanism empowers these vehicles to achieve a remarkable 360° operational range, ensuring efficiency in various lifting tasks. In this article, we delve into the fundamental components and workings of the slewing mechanism, shedding light on its crucial role in the functionality of truck cranes.

truck crane
truck crane

1.1 The Key Components of Slewing Mechanism

Understanding the core elements that constitute the slewing mechanism is vital. The primary components include:

  • Slewing Support
  • Slewing Gear Ring
  • Slewing Reducer
  • Slewing Motor
  • Slewing Pump
  • Slewing Control Device
Slewing Mechanism
The Composition of Rotary Mechanism

1.2 The Driving Force: Slewing Hydraulic System

The slewing hydraulic system serves as the powerhouse behind the mechanism’s seamless operation. It can be broadly categorized into open and closed systems. While small-tonnage cranes often adopt open systems, their larger counterparts opt for closed systems.

2. Demystifying the Closed Rotary Hydraulic System

2.1 Components of Closed Rotary Hydraulic System

Let’s explore the intricate components that constitute the closed rotary hydraulic system, ensuring a robust slewing process:

  • Closed Pump
  • Rotary Motor
  • Rotary Brake
  • Brake Control Valve
  • One-way Throttle Valve
  • Free-sliding Valve
Closed Rotary Hydraulic System
The Hydraulic Principle of Rotary System

2.2 Slewing Work Process in Closed System

The closed rotary hydraulic system follows a precise workflow, involving the activation of brake control valves, slewing brake, and directional control of the slewing motor. The advantage lies in its stability, efficiency, and hydrostatic braking capability.

Closed Rotary Hydraulic System
The Principle of Free Slip

3. Navigating Through Common Truck Crane Slewing Faults

3.1 Slewing Failure: Troubleshooting Essentials

When confronted with slewing failure, a systematic approach is crucial. Begin by eliminating electrical issues, ensuring power to the pump and solenoid valve. Subsequently, check for potential brake valve obstructions and free-slide valve anomalies.

3.2 Addressing Slow Rotation Woes

Slow rotation issues demand a meticulous inspection of pressure levels. If pressure is too low, scrutinize pump currents and internal motor leakage. Conversely, excessively high pressure may indicate insufficient brake opening or mechanical friction.

Conclusion: Mastering the Dynamics of Slewing Mechanism

In conclusion, comprehending the intricacies of the truck crane slewing mechanism is pivotal for operators and enthusiasts alike. The synergy of components, the nuances of hydraulic systems, and troubleshooting techniques collectively contribute to the flawless operation of these remarkable vehicles.

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