4 Ton Knuckle Boom Truck Mounted Crane

F084K-03 4-Ton Knuckle Boom Truck-Mounted Crane

Many lifting projects take place in confined spaces where the positioning and extension of conventional cranes are restricted. Buyers often struggle to distinguish between telescopic boom cranes and knuckle boom cranes, leading to incorrect model selection and wasted budgets. This 4-ton knuckle boom truck-mounted crane utilizes an articulated (knuckle) boom structure to operate effectively in tight spaces; its lightweight design balances lifting capacity with the truck's cargo-carrying ability, meeting the need for flexible operations. It features a rated maximum lifting capacity of 4,000 kg, a maximum lifting moment of 8.4 ton-meters, a maximum working radius of 7,700 mm, and a slewing angle of up to 400°. The hydraulic system operates at 26 MPa with a flow rate of 25 L/min. The unit weighs 1,250 kg and has an installation width of just 850 mm, making it suitable for mounting on light trucks.

A wide range of optional accessories is available, including wireless remote controls, hydraulic winches, grabs, man baskets, oil coolers, manual boom extensions, and load moment limiters. It can be fitted with a grab bucket for handling bulk materials, complementing land-based and marine lifting solutions (such as telescopic or knuckle boom marine cranes). For timber handling, a log grapple attachment can be installed—similar to forestry crane configurations. It is widely used for cargo loading/unloading, municipal maintenance, construction in confined areas, and aerial work.

1. Product Features: Compact body and lightweight design minimize the impact on the truck chassis's payload capacity; the articulated boom offers flexible maneuvering with a 400° slewing range for wider work coverage; comprehensive safety features are included, with additional options available upon request.

2. Usage Tips: Consult the load chart to verify the lifting weight and radius before operation; overloading is strictly prohibited. Activate the cooling system during prolonged continuous operation to protect hydraulic seals.

FAQ

Q1: Can it directly replace a telescopic boom crane?

A1: Direct replacement is not recommended. Knuckle boom cranes excel at lifting operations in confined spaces where obstacle avoidance is required; telescopic boom cranes are better suited for long-reach, straight-extension lifting tasks. Please verify on-site operating conditions before placing an order.

Q2: What should be checked during routine maintenance?

A2: Conduct daily inspections for hydraulic line leaks; regularly apply grease to slewing and articulation points; and periodically calibrate safety components such as the load moment limiter and remote control system.

Q3: What is the warranty and spare parts availability?

A3: A standard warranty is provided for the main unit (excluding wear parts). We offer long-term supply of genuine spare parts and provide remote technical support to guide the installation and commissioning of various optional attachments.

Q4: Can work attachments like grapples or man baskets be installed?

A4: Yes, the unit supports the installation of hydraulic winches, grapples, man baskets, and more. For timber handling, a log grapple attachment can be configured, similar to a forestry crane setup.

Q5: Can this crane be converted into a marine version?

A5: This model is designed for truck mounting and is not suitable for corrosive marine environments. For offshore lifting, we recommend a ship-mounted telescopic boom crane or a marine knuckle boom crane, which come with marine-grade anti-corrosion specifications.