THL 21 L Tandem hook lift trailers

Towing device

Rigid clevis type coupling. A wide steering angle is assured thanks to the ultra-slim design. The rectangular tubing design with rounded edges prevents the lug nuts on the tractor rear wheel from being damaged. Practical brackets are provided for the hydraulic hoses, light cables, etc. The hydraulic hoses are marked with “plus” and “minus” in oil-resistant markings.

Small turning circle

The slim design of the drawbar makes for a very large steering angle and significantly reduces the turning circle. With the optional positive steering, the adjustable collision protection guard can be tailored to the tractor.

Chassis

For our chassis we use only rectangular tubing made of high-grade steel that is sealed all round; no cheap pressed steel or welded constructions. The large-volume rectangular tubing saves weight, is extremely torsion-resistant and has no open joints or cracks, making it easy to clean. Visually too, it makes a good, clean and neat impression.

Running gear Air suspension

The air suspension ensures a smooth ride, even on unpaved roads. Fitted with level control valve + ALB as standard for consistent ride height. Large springs paired with 360 mm air bellows ensure maximum comfort even with a high payload. Automatic lowering of the running gear when tipping out the load ensures a high degree of stability. All components come from the trucking sector and have a robust, durable design . 

Axles

BPW axles with automatic slack adjusters, axle cross-section 150 x 150 mm, track width 1.95 m, wheel brake 410 x 180 mm, 10-hole wheel end 13.0 t single axle load at 40 km/h

Lighting system

High-end 3-chamber rear lights with impact-resistant lens; all lights feature LEDs; secured by a stable light support with “pitched roof” to prevent the accumulation of dirt.

Hook-lift tandem body

Hook-lift body:

• Hook height 1.57 m, hook system mount in accordance with DIN 30 722 Part 1
• As all hydraulic cylinders are dual-acting, only a minimal amount of oil is required

Operating principle:

• Only three dual-acting control units are needed on the towing vehicle for the two main working cylinders, the push arm and the hydraulic container locking mechanism
• Two main working cylinders for the tipping frame offer maximum stability and torsion resistance if containers are hoisted at an angle
• The standard push arm ensures a very low lifting angle
• Due to the push arm, the tongue load on the towing vehicle can be adjusted as required by simply moving the container
• Containers of different lengths can be used
• The push arm can also be used to set the required tipping height (rear overhang)
• If the push arm is fully retracted, the hook device automatically switches from "Tip container" to "Lower or raise container", this means that the driver no longer has to climb down and can control all functions from the cab
• A hydraulic internal locking mechanism is supplied as standard that also allows containers with different lengths to be locked in place in any position
• When raising and tipping containers, the air is released from the running gear bellows (fast lowering valve), a process which offers a host of advantages:
  1. The lowered roller height results in a very low lift angle
  2. The effectiveness of the two main working cylinders is improved, as their associated tilt angle gets bigger and this in turn increases the lifting capacity
  3. When lifting the containers, the chassis is supported on the rear axle, eliminating the need for complex hydraulic support
  4. The standard level control valve also means that a laden vehicle always stays at the same ride height and the loading height is extremely low
  5. The stability when tipping and emptying the roll-off containers is increased     
  6. Outstanding ride comfort is ensured thanks to the air suspension (on- and offroad)