Trailer cranes

K21-30 RS

Despite its low net weight of 3.5 t, the K21-30 RS is an efficient all-rounder. Its tremendously strong fly jib hinge enables loads of up to 1,500 kg to be picked up, whilst it can lift a weight of 250 kg laterally 21 m away. Due to the single-axle operation, the trailer scores highly with great manoeuvrability, optimal weight distribution and more ground clearance. With the help of the self-drive mechanism, the K21-30 TSR can manoeuvre easily on the building site. Thanks to a retractable drawbar, its overall length can be reduced to 7 m, meaning that the crane can also be easily set up in inner-city areas.

K21-30 RS at WorkProduct sheet K21-30 RSBrochure trailer cranes

Equipment

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

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  

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

H-Outriggers

  • 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

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

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

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

Self-drive mechanism

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

Optional equipment

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

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

Technical specifications

Hook load (stand./opt.)1,500 / – kg
Hook height29.8 m
Total weight≥ 3.5 t
Boom length30.70 m
Outrigger width (min.)2.85 m
Outrigger width (max.)5.04 m
Winch capacity1,500 kg
Boom (1,500 kg)5.46 m
Extension 1 (800 kg)9.12 m
Vehicle dimensions9.24 x 2.28 x 2.59 m
Towing capacity3.50 t

Working range

LoadRangeHeight
1,500 kg4.50 m22.00 m
1,000 kg8.00 m20.80 m
800 kg9.50 m24.50 m
500 kg14.00 m24.00 m
250 kg21.00 m17.50 m

Working range diagrams

Crane operation

Your sales contact person

+49 (0) 2593 – 95 92-5002

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.