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What is the Role of Rear Outriggers in a Truck-Mounted Crane?

A truck-mounted crane, also known as a “随车吊” (Suí Chē Diào), is a versatile vehicle that combines the functions of lifting and transporting cargo, making it increasingly popular across various industries. Many truck-mounted cranes are equipped with hydraulic outriggers, which are divided into front and rear outriggers. While most people understand the role of the front outriggers—primarily to distribute the weight of the vehicle and increase load capacity—there is often confusion about the function of the rear outriggers. Let’s explore the purpose of rear hydraulic outriggers.

Placement of Rear Hydraulic Outriggers

Rear outriggers are typically installed at the rear axle, beneath the chassis of the truck-mounted crane, often taking the form of an H-shaped design. Their primary role is to provide support to the rear section of the vehicle during crane operations. When the crane is lifting heavy loads, the rear outriggers transfer part of the load to the ground, thereby ensuring stable support and reducing the pressure on the tires. This minimizes the risk of accidents caused by tire stress or deformation during heavy lifting tasks.

Types of Rear Hydraulic Outriggers

There are several types of rear outriggers commonly available in the market:

  1. Fixed Outriggers: These can only move vertically up and down. They provide basic support during crane operations and are used to assist in stabilizing the vehicle during lifting tasks.
  2. Single-Chamber Hydraulic Outriggers: These outriggers can extend both horizontally and vertically. They extend beyond the dimensions of the cargo box, offering better support on uneven or soft ground, where extra stability is needed.
  3. Dual-Chamber Hydraulic Outriggers: These outriggers can extend further horizontally than the single-chamber type and also feature vertical extension. This design provides even greater support and stability, particularly for lifting tasks that approach the crane’s maximum capacity or require operations over a larger working radius.

Applications of Rear Hydraulic Outriggers

Rear outriggers are particularly useful in the following situations:

  • Uneven or soft ground: When the ground is not level or is soft, rear outriggers help stabilize the vehicle during lifting operations, preventing it from tilting or sinking.
  • Larger working radius: When the crane is operating at its maximum working radius, the rear outriggers provide critical support to ensure safe operation.
  • Near-maximum lifting capacity: When lifting loads close to the crane’s maximum rated capacity, rear outriggers distribute the load more effectively, reducing the strain on the crane and vehicle.

Conclusion

The rear hydraulic outriggers on a truck-mounted crane play an essential role in ensuring safety and stability during crane operations. By transferring part of the load to the ground, they reduce pressure on the vehicle’s tires and help prevent accidents. Choosing the right type of rear outrigger depends on the crane’s tonnage, the working environment, and the lifting requirements. Proper use of rear outriggers can significantly enhance the efficiency and safety of crane operations.

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