Trailer cranes

With a maximum load capacity of 3,000 kg, the K400 is the most powerful Klaas trailer crane, with a hook height of more than 34 m. Equipped with a duar hydraulically telescopic fly jib, it represents considerable added value for everyday work in the urban sector, on tight building sites and in assembly mode. The first two elements of the fly jib can be retracted or extended by remote control, even in platform mode. This means that the trailer crane can be set up even where there is little room, thus opening up new application areas for working with and without a platform.

With the newly developed V2-support, the K400 has a support behaviour that is otherwise only known from large truck cranes. It ensures a quiet and safe stand even with high loads. The large lift of the outriggers enables a consistently large support surface even on uneven terrain and thus high performance values.


Telescopic winch

  • quick telescoping under load thanks to patented Klaas rope technology
  • integrated electronic length measurement records current extension length of the mast and calculates maximum possible payload
  • low net weight of the ropes increases range of action and payload
  • low-maintenance and very easy to reach rope technology

Energy supply

  • protected routing of all moving electrical and hydraulic leads in or on the mast
  • no hose or cable reels on the mast
  • low-maintenance hydraulic pipework made of galvanised steel used in the substructure, meaning there is no need to change hydraulic hoses

Double derricking cylinders

  • boom raised with low torsion thanks to two luffing cylinders
  • double safety due to two cylinders
  • better absorption of lateral guide forces, making the boom more stable and still
Video: Double derricking cylinders

Twin luffing cylinders

  • folding jib joint is milled "from the solid" and thus enables higher load bearing capacity
  • electronic monitoring in the joint guarantees optimal lifting of loads in any angular position
  • twin luffing cylinders for even more security and protection against lateral forces
Video: Twin luffing cylinders  

Radio remote control

  • precise starting thanks to sensitive joysticks
  • large display provides a clear indication of all the crane’s key operating statuses
  • power supplied by standard batteries or cable
  • equipment with memory function possible
  • this learns two target points (e.g. where material is on the ground and unloading point on the roof), during which the crane moves in safe hold-to-run mode

Automatic levelling

  • the crane is completely set up quickly and easily using the radio remote control
  • each individual support infinitely extends laterally
  • automatic levelling of the support cylinders for optimal set-up even on uneven surfaces
  • constant pressure monitoring reacts to changing outside conditions

Endlessly rotatable

  • high-quality turntable from German brand manufacture
  • well thought-out rotary guide enables endless rotation of the upper carriage in both directions
Video: Endlessly rotatable

Boom system

  • extremely strong and weather-resistant aluminium special alloy with low net weight
  • no strength loss in the welding seam due to stir welding process, joints are as strong as the solid material
  • typical Klaas hole pattern ensures smaller wind-exposed areas, low net weight and high dent resistance

Crane control system

  • complex control system according to EN 280 and EN 13000
  • ultra-modern safety PLC for the crane operation
  • CAN BUS control block for particularly sensitive and accurate work
  • soft start/stop for low-vibration work
  • extension with additional remote control possible

Full panelling

  • roomy, lockable storage compartments
  • secure storage of tools and accessories
  • large storage surface on the crane
  • high-quality, neat overall appearance thanks to aluminium full checker plate panelling

Drive concept

  • powerful diesel engine for the crane operation
  • low fuel consumption meaning enormous cost saving and reduction of environmental impact
  • electronic tank monitoring on the crane and display via the remote control unit

Retractable drawbar

  • reducing the total length from 9.25 m to 7.00 m enables set-up even where there is not much room


  • optimum stability due to V2-support
  • excellent use of the available space
  • variable installation possibilities according to local conditions

Double hydraulic, telescopic fly jib

  • hydraulic telescoping of the first and second folding top elements via the radio remote control
  • simultaneous extension of both drawers ensures optimum load distribution
  • utilization of the folding tip even in narrow body situations thanks to "extending in the air"
  • hydraulic telescoping also in stage operation
Video: double hydraulic, telescopic fly jib

Self-drive mechanism

  • hydraulic self-drive mechanism operated by standard remote control
  • easy manoeuvring in tight spaces

Personal safety mode

  • personal safety mode in accordance with BG guidelines
  • for working at great heights without stationary securing options such as scaffolding or safety eyes
  • securing of persons by crane boom allows free working at exposed places

Optional equipment

Hybrid drive

  • optional drive by diesel engine or environmentally friendly electric motor
  • electric motor can be removed without tools for transport on the road

Mounting-/glass hook

  • assembly hook enables precise material transport
  • application area: e. g. glass mounting with vacuum lifter
  • flexibility in length and tilt angle facilitates difficult installations

Accessory fix system

  • accessories are securely stored and immediately within reach
  • no cumbersome lashing necessary
  • custom-fit holders ensure safety on the road
  • crane equipped with fitting brackets

Working platform

  • The crane can be converted to a fully-fledged working platform in less than 5 minutes.
  • with 230 V socket and standardised lashing points for securing persons
  • The working platform can be swivelled left and right by 45° to either side.

Technical specifications

Hook load (stand./opt.)1,600 /3,000 kg
Hook height34.3 m
Total weight≥ 3.5 t
Boom length35.81 m
max. working height HA30.60 m
Outrigger width (min.)3.71 m
Outrigger width (max.)5.46 m
Winch capacity1,600 kg
Boom (1,600 - 350 kg)5.01 - 11.81 m
Extension 3 (250 kg)13.97 m
Vehicle dimensions9.34 x 2.36 x 2.68 m
Towing capacity3.50 t

Working range

1,600 kg5.00 m21.00 m
1,000 kg9.00 m19.00 m
500 kg16.50 m22.00 m
350 kg18.50 m25.00 m
250 kg24.00 m22.00 m
3,000 kg3.00 m9.00 m
2,000 kg5.50 m6.00 m

Working range diagrams

Subject to technical changes. All dimensions are approximate. The right is reserved to alter the functions and performance. The information reflects the appliance performance at the time of publication.
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