Demag AC 335J

The Demag AC 435J is a robust and adaptable 140-ton all-terrain crane designed to tackle demanding lifting projects in construction, industrial maintenance, and infrastructure development. Its 10x8x8 drive configuration allows for enhanced mobility, making it suitable for use in both urban settings and challenging off-road environments. With its powerful engines, advanced hydraulic systems, and comprehensive lifting capabilities, the AC 435J provides a reliable and efficient solution for a range of lifting tasks.

Carrier Specifications: The carrier of the AC 435J is built on a monobox frame with high-grade close-grained steel construction, providing strength and durability. The crane features a 10x8x8 drive and steering configuration, where axles 1, 2, 4, and 5 are both driven and steered, while the 3rd axle is non-driven. The differential lock-out system ensures that the crane maintains traction on difficult terrains, while the ZF transmission with 8 forward gears and 1 reverse gear offers smooth and efficient power delivery. The electro-pneumatic gearshift system is coupled with a torque converter, making it easy to switch between high and low ranges, enhancing the crane’s adaptability.

The AC 435J is powered by a Daimler-Benz OM 442 LA water-cooled 8-cylinder diesel engine, producing 320 kW (435 HP) at 2100 rpm and a maximum torque of 1765 Nm at 1100 rpm. The engine’s 450-liter fuel tank provides ample capacity for extended operations, ensuring that the crane can operate efficiently over long periods without refueling. The suspension system is hydraulically controlled, with oil-pressurized suspension and the capability to block all axles hydraulically, which contributes to stability during travel and lifting operations. The crane is fitted with 16.00 R25 main tires and 11.25-25 spare tires, further enhancing its versatility and adaptability across various terrains.

Superstructure Specifications: The superstructure of the AC 435J is powered by a Daimler-Benz OM 366 A 6-cylinder diesel engine, rated at 119 kW (163 HP) at 2300 rpm, with a maximum torque of 580 Nm at 1400 rpm. This engine drives the crane’s advanced hydraulic systems, which include two variable-displacement axial-piston pumps for simultaneous multi-functional operations. The hydraulic system is designed for precision and efficiency, with additional constant-displacement pumps to manage lower pressure systems.

The crane is equipped with a 5-section telescopic main boom that extends from a base length to a maximum of 50 meters. The design incorporates Demag’s signature “ovaloid” cross-section, featuring self-centering sliders for enhanced stability and strength. For tasks requiring greater reach, the AC 435J offers multiple jib configurations:

• Extension Jib: Available in lengths of 10 meters or 17 meters, with jib angles of 15° or 30°.
• Non-Luffing Fly Jib: Ranges from 12 to 30 meters, with angle adjustments of 3° or 20°, providing flexibility for diverse lifting scenarios.
• Luffing Fly Jib: Extends from 18 meters to 36 meters, offering adjustable angles for precise and high-reaching lifts.

The maximum reach with the full extension and jib configuration is up to 86 meters, allowing the AC 435J to perform a wide range of lifting tasks, from heavy industrial loads to high-rise building maintenance.

Lifting Performance and Superlift System: The AC 435J’s lifting capabilities are further enhanced by its optional Superlift system, which consists of a boom suspension with guy ropes and an adjustable lattice-type configuration. This system provides greater boom stability and allows for heavier loads, effectively increasing the crane’s capacity without sacrificing performance. The Superlift can be quickly deployed or retracted hydraulically, making it easy to adapt to various lifting conditions.

The crane offers a range of hook blocks, including:

• 9-Sheave, 140-ton Capacity Hook Block (18 units, 1400 kg)
• 5-Sheave, 81-ton Capacity Hook Block (11 units, 1216 kg)
• 3-Sheave, 51-ton Capacity Hook Block (7 units, 1055 kg)
• 2-Sheave, 35-ton Capacity Hook Block (3 units, 760 kg)
• Single-Sheave, 7-ton Capacity Hook Block (1 unit, 370 kg)

These configurations provide flexibility in handling various types of loads, ensuring that operators can perform tasks ranging from heavy lifts to more delicate operations with ease.

Operational Efficiency and Safety: The AC 435J is equipped with advanced safety and control features, including an electronic load moment indicator, limit switches, and pressure relief systems. The cab features ergonomic controls, digital displays, and clear instrumentation, allowing operators to monitor load weights, boom angles, and other operational parameters in real-time. The cab is designed for operator comfort, with features such as a large folding-out windscreen, adjustable seating, air conditioning, and heating, ensuring a comfortable working environment throughout long shifts.

The boom’s hydraulic pin-lock system simplifies the process of telescoping and adjusting boom lengths, while the anti-twist hoist drum with a spring-loaded brake ensures smooth and safe lifting operations. The crane also includes an auxiliary winch and the capability to attach a secondary hoist for added flexibility.

Optional Equipment and Accessories: To enhance its versatility, the Demag AC 435J offers a range of optional equipment:

• Additional Counterweights (up to 10 tons): For added stability and increased lifting capacity.
• Boom Pin-Lock System: Simplifies setup and ensures safe operation during telescoping.
• Tow Coupling and Air-Brake Coupling: Enables easy transport and mobility.
• Crab Steering (10x8x8 Drive/Steering): Enhances maneuverability, particularly in tight spaces.
• Superlift Attachment: Improves load capacity and boom stability, with 13-ton counterweight options.
• Luffing and Fixed Fly Jibs: Offer increased reach and flexibility for complex lifting tasks.