Trailer cranes

Thanks to its enormous load capacity of 1,600 kg, the K400 RSX is the most powerful Klaas trailer crane, with a hook height of almost 32 m. Equipped with a 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 element 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.

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Boom system

  • extremely strong and weather-resistant aluminium special alloy with low net weight
  • no strength loss in the welding seam due to new 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


  • fully hydraulic support in conjunction with the ASC support monitoring system enables infinitely variable outrigger widths, also in the direction of the range of action
  • no fixed increments that restrict the operator
  • l-shaped support ensure best possible safety against overturning
  • support without underpinning possible thanks to long, vertical cylinder

Hydraulic, telescopic fly jib

  • fly jib equipped with patented Klaas telescope technology
  • first fly jib element can be telescoped out infinitely by remote control – even platform operation

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

Twin luffing cylinders

  • higher loads lifted on integrated extensions thanks to newly designed folding jib joint
  • pressure monitoring in the folding jib cylinders guarantees optimal lifting of loads in any angular position
  • twin luffing cylinders for even more security and protection against lateral forces

Endlessly rotatable

  • upper structure with the boom can be rotated 360°

Dual 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

Telescoping 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

Crane control system

  • 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
  • radio remote control with LCD display (can also be operated with cable, e.g. in case of wireless network interference)

Radio remote control

  • memory function 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
  • difficult-to-see places moved to with pinpoint accuracy
  • all the crane’s key operating statuses shown on the display
  • power supplied by standard batteries or cable

Retractable drawbar

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

Self-drive mechanism

  • hydraulic self-drive mechanism operated by standard remote control
  • two-axle models equipped with a lift axle
  • easy manoeuvring in tight spaces

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

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

Optional equipment

Personal safety mode according to BG guidelines

  • models are prepared for 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

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

Mounting-/glass hook

  • every Klaas mobile crane can be equipped with an optional mountinghook function
  • assembly hook enables precise material transport
  • application area: e. g. glass mounting with vacuum lifter

Working platform

  • The crane can be converted to a fully-fledged working platform in less than 5 minutes.
  • 230 V socket provides power for electric tools in the working platform.
  • 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 height31.8 m
Total weight≥ 3.5 t
Boom length32.60 m
Outrigger width (min.)3.50 m
Outrigger width (min. by HA)3.90 m
Outrigger width (max.)5.63 m
Winch capacity1,600 kg
Boom (1,600 kg)4.85 m
Extension 1 (800 kg)8.50 m
Extension 2 (500 kg)10.82 m
Vehicle dimensions9,49 x 2,28 x 2,69 m
Towing capacity3.50 t

Working range

1,600 kg5.00 m19.50 m
800 kg9.50 m24.80 m
500 kg15.00 m20.80 m
250 kg23.00 m18.80 m
3,000 kg3.20 m7.40 m
2,000 kg5.50 m4.40 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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