With Central Frame 

K.T.S Timber Trailers
8.5 - 11.0 ton
Owning forest also means taking care of it in order to maintain and increase the value of the property. What is it worth to you to take care of windfallen or dry trees, wood etc. when it suits you and your forest best? Does that mean freedom to you too?

The K.T.S Crane and the K.T.S Trailer are designed to work together as a hard-wearing complete unit.

FEM (Finite Element Method) design ensures that all components of the crane and trailer are carefully matched to each other in terms of strength. This avoids, on the one hand, an excessively heavy trailer and, on the other, a trailer that is light but which will have only a limited life. Which is the cheaper in the long run - a strong trailer with a long life, or one that lasts only a few years?


This information describes the main features of our timber trailers and hydraulic cranes. For more specific information, please order our 28-page brochure! It contains 156 pictures, specifications and lots of information.

Focus on the customer
We are always focused on customer requirements when designing and developing our products. Over 1 500 customers have replied to our continuous surveys, thus providing valuable hints and ideas for the design of our machines. On the basis of this, we have built and further developed K.T.S Timber Trailers and Cranes. 

Now, the final choice is yours, as the customer. We look forward to seeing you as yet another satisfied customer and owner of K.T.S equipment.

Any questions? Please, call us! We would be pleased to assist you, both before and after buying K.T.S equipment.



K.T.S means quality and strength, right down to the smallest detail

The slewing house is the component through which all forces act. This is why the K.T.S slewing house is extremely high, at 290 mm, to increase the distance between the load-carrying bushings. The greater the distance, the greater the strength, which is most important when lifting heavy logs or if the crane is to be fitted with a digging unit. The difference can be seen when comparing these features with those of other cranes.

The slewing mechanism, crane post and boom mounts together form a very substantial and strong unit. The design of the slewing house and cylinders enables the crane to slew through 370.

The slewing house is entirely Swedish-manufactured, from quenched and tempered steel.

The entire slewing mechanism, with the slewing shaft, gear racks and slewing pistons, runs in an oil bath for maximum strength. 

Look at the matchbox in the picture above, and you will realize the strength of the slewing house.

All K.T.S Cranes are equipped with the same slewing house. All that differs is the choice of materials for racks and pinions, see specifications.

The K.T.S Comfort Joint on all models greatly simplifies work

The Comfort Joint
is an additional joint that significantly increases the motions available, i.e. the crane can work much more closely inboard. Some manufacturers' cranes have the hydraulic cylinder connected directly to the boom, which restricts the angle through which the boom can move. When loaded with such a crane, the logs are gripped at the middle as usual in order to provide balance, but they cannot be loaded sufficiently far forward on the trailer. The grapple has to be released and moved to a new grapple on the logs, in order to move them forward on the trailer. The K.T.S Comfort Joint makes it possible for you to grapple the logs from the ground for direct loading onto the trailer, without having to re-grip the logs, also making it easier to operate the K.T.S Crane.

The Comfort Joint also means you can
lift timber close to the tractor.

Naturally, the K.T.S Crane can slew through an angle of 370, enabling it to reach timber in front of the tractor.

All functions of the K.T.S Crane are double-acting, which is a prerequisite for digging with the crane. Moreover, it is most useful with double-acting functions, should the trailer overturn, so that it has to be raised by means of the crane.

K.T.S Crane 6.3 m

The K.T.S Comfort Joint simplifies the work, as it allows timber to be loaded without having to re-grip it. It also means that short 1 m lengths can be loaded against the gate, which can be useful when, for example, logs are very large, and have to be cut into 1 m lengths on order to enable the crane to lift them.

The Comfort Joint also provides greater flexibility when loading, for example, brushwood.

It also allows the crane to be folded so that it takes less space.

Outriggers or telescopic support legs - which are most suitable for you?

The picture shows both telescopic support legs and outriggers to demonstrate that both alternatives are possible, but in practice you choose only one of these.

  • K.T.S provides a choice between outrigger legs and telescopic support legs.
  • Both types have their advantages and drawbacks. With both available, you can choose which is the best for you.
  • Both have excellent ground clearance when raised/retracted, thus minimizing the risk of catching in stumps, boulders or shrub growth.
  • Both types can be extended to some distance below the nominal ground level, which means that the trailer can be levelled even if a leg happens to be over a hollow.
  • The support legs are secured to the 3-point adaptor by very substantial bolts, in order to withstand heavy use.


Easy to transfer the crane from the trailer to the tractor's 3-point hitch

K.T.S believes that it should be simple to transfer the crane from the trailer to the tractor's 3-point hitch. Just imagine how useful it is to be able to use the crane for other purposes, which would not be possible if it was permanently mounted on the trailer. This means that the crane can also be used for:

  • General lifting duties at building sites.
  • Lifting fertilizer or seed bags for spring planting.
  • Using the crane to dig with.
  • Loading bulk powders etc. after fitting liner plates in the grapple.

The connection between the 3-point adaptor and the trailer is a particularly critical point, carrying heavy loads. Our 3-point adaptor is therefore secured to the trailer by eight M20 bolts. Using bolts, rather than pins, means that there is no possibility of wear gradually developing.

The 3-point adaptor is a welded box structure. This ensures that the forces from the crane are evenly distributed to the support legs and the trailer chassis.

 More intelligent solutions simplify work and increase strength

All hydraulic cylinders are mounted above the booms, and all hoses are run inside the booms, thus protecting them from damage by logs. Protecting the cylinders reduces breakages and lowers costs.

With the slewing mechanism designed the K.T.S way, the crane can be turned through 370. In combination with the K.T.S design of the drawbar steering of the trailer, this enables you to reach even logs located in front of the tractor.

Just imagine what an advantage, when the logs are difficult to reach!

  • Drive straight ahead to the logs! It is always easier than reversing, because you have a better overview, and the risk of damaging the tractor or growing plants is reduced considerably.

  • Adjust the drawbar steering so that the trailer will come somewhat outside of the tractor, see picture above.
  • Turn the crane to the front and pick up the logs.
  • Operation is easier using the K.T.S units.


Choose between different types of control lever systems

For the controls there is also a variety of models to choose from. Order our brochure and read more about it!


More intelligent designs and smarter solutions

  • K.T.S Timber Trailers deliver! Very large loading area!
  • 1.8 m2 for the 8.5 ton trailer.
  • 2.35 m2 for the 10.0 and 11.0 ton trailers.
  • These are actual measurements. Compare them with the loading areas of other trailers, but check how the values have been calculated!
  • The loading area is very large, despite the fact that the total width does not exceed 2.05 m on any of the models. Narrower vehicles are easier handled in the forest.
  • Generous ground clearance height increases accessibility.
  • The substantial central frame of 180 x 180 mm special steel withstands many years' hard work. The diameter of the frame is more important from a durability point of view than the thickness of the material. Look at a load chart for KKR frames and compare! We previously used both 140 x140 and 160 x 160 mm, but a larger centre frame has a better strength.
  • The bogie position can be changed, to suit different log lengths, provided the trailer is not equipped with a brake.
  • The bogies are of climbing type, with extra-large wheels, providing good load-carrying capacity even over wet ground.

The trailer steering cylinders are very well protected against damage. The bottom plate protects the entire underside of the cylinders. As a result, there is less risk of damage, and lower operating costs.

The steering pivot has been arranged immediately in front of the carne, which means that the following components can be made much more substantial:

  • The pivot
  • The joint between the 3-point adaptor and the trailer
  • The fastenings of the headboard

As the steering pivot can swing through 40 to either side, manoeuvrability is just as good as if the pivot was further back.

Should the timber trailer be equipped with a centre frame or a square frame? An often asked question is: why has K.T.S and most other manufacturers chosen a centre frame? The most important thing for the strength of cranes and trailers is that the construction can be elastic and moving during work. If the construction is stiff it will burst eventually.

The centre frame with its front edge insert attachment has been specially welded-in, so as to avoid any kerfs. Along its entire length towards the rear there are neither welds nor bores, which is a condition for maximum strength.

The square frame shows a number of critical points, such as the attachment between the front edge and the first transversal frame and all four corners, in particular the foremost, where cracks easily develop.

A construction with a centre frame also weighs less, which means that the trailer can carry heavier loads.


More operating areas for the K.T.S Timber Trailer

Transporting brushwood an a standard equipped timber trailer means many transports with small loads each time. More fuel will be used and many extra hours will be spent.

This is why K.T.S has developed the optional equipment for
loading twice as much on the trailer. Just think about it - what will driving back and forth 50 times instead of 100 mean to you?

K.T.S Timber Trailer may be fitted with brushwood supports which increase the width of the load to 3 metres. You can also mount a 1.2 m frame extension and an extra bolster, thus increasing the load volume to the double!

With unloaded trailer you may easily retract the supports so that the transport width will not cause a problem.

There is also a brushwood grapple which has been especially developed and which makes it easier to load brushwood since the branches will not get stuck in the grapple as easily.

Our cranes may also be equipped with an auxiliary pump. This is convenient when the crane is used together with an older tractor with less oil flow, or when the crane is run with different tractors to avoid mixing of various oils.

With a separate pump you can also run the crane on a low number of revolutions on the tractor, thus
saving fuel.

There are two different  models: a fixed pump on the draw bar and power outlet shaft to the tractor or the pump fitted directly on the power outlet pivot of the tractor. Choose the one that best suits your requirements!

The hydraulic oil tank is situated in a very low position to prevent it from obstructing visibility. The tank is equipped with a sight glass to enable a simple oil check. A return oil filter purifies the oil and protects the pump.


K.T.S Timber Trailer 11.0 t

In order to make K.T.S Timber Trailer and K.T.S Crane as safe as possible, we also had it 3rd party CE certified. The operating manual has also been reviewed for easy understanding.

Now it's up to you! We here at K.T.S look forward to having you as yet another satisfied customer of ours!


K.T.S Crane mounted on a tractor/forwarder or 3-point mounted on an existing trailer

The K.T.S Crane is very adjustable for different purposes and fittings, as is shown in the pictures, fitted on a Valmet 805. If you want to you can fit it on a forwarder.

You can also mount a small harvesting device on the K.T.S Crane.

One of the reasons the K.T.S Crane is so versatile is that you can order it with different crane pillar lengths, as you can see in the specifications.   

K.T.S Timber Trailer
Equipment Trailer 8.5 ton Trailer 10.0 ton Trailer 11.0 ton
Maximum load 8.5 ton 10.0 ton 11.0 ton
Standard crane; it is possible to install a crane up to 7.5 m 5.3 m 6.4 m 6.7 m
Effective load area  1.80 m2 2.35 m2
Chain saw box   Extra equipment Yes/standard
Gate Yes/standard
Gate height 1 100 mm 1 400 mm
Stake height 1 100 mm 1 400 mm
Dimensions on stakes 89 x 6 mm
Stake extensions No, stakes are in one piece
Divider stakes, for timber sorting Extra equipment
No. of bolsters 2 3
More bolsters can be fitted Yes
Hydraulic support legs Yes/standard folding legs
Telescopic support legs Extra equipment
Trailer steering Yes/standard
No. of steering cylinders 1 2
Max. steering angle 40 to both left and right
Towing eye to tractor Forged towing eye for hitch connector
Lubricatable bushings or link bearings in all joints Yes/standard
Diameter of steering pivot 70 mm
Bogies Yes/standard
Tip angle of bogies +/- 30
Axle separation 995 mm
Distance on bogie from centre of front axle to centre of pivot 530 mm
Track width 1 622 mm
Tyre size standard 
Other sizes available to order
400/60 x 15.5 
400/60 x 15.5 
tractor tread
Brakes, drum or disc Extra equipment
Number of hydraulic outlets required 2 double-acting or 1 single-acting with separate return
Extra equipment available to enable use with 1 single-acting and 1 return
Brake hoses run well protected in steel tubes between brakes and central frame Yes/standard when trailer is fitted with brakes
Support foot Extra equipment
Hydraulic wheel drive Extra equipment
Stub shaft dimension 70 x 70 mm 80 x 80 mm
Central frame of special steel 180 x 180 x 6 mm 180 x 180 x 8 mm 180 x 180 x 10 mm
Loading width at bottom of load area 910 mm
Loading width at top of stakes 1 830 mm
Loading width at top of stakes for brushwood equipment 3 000 mm
Overall height including crane at hitch height 400 mm;
this dimension depends on the height of the tractor hitch hook
About 2 668 mm About 2 968 mm About 2 773 mm
Recommended tractor power for full load 45 hp and up 60 hp and up 65 hp and up
Weight, complete timber trailer 2 391 kg 2 609 kg 2 840 kg
Weight complete, without crane and 3-point adaptor 1 360 kg 1 495 kg 1 555 kg

K.T.S Hydraulic Crane
Equipment Crane 5.3 m Crane 6.4 m Crane 6.7 m Crane 7.5 m
Reach 5.3 m 6.4 m 6.7m 7.5 m
Comfort joint to simplify work Yes/standard
Hydraulic extension No Yes/1.2 m Yes/2.0 m
Gross lifting force of crane 3.5 tonmeter 5.0 tonmeter
Grapple area of standard grapple 0.18 m2 0.21 m2
Fully rotating rotator Yes/standard
Rotator torque 750 Nm (75 kpm)
Slewing attenuator on rotator link Yes/standard
Hydraulic support legs on the trailer when sold with crane Yes/standard
Telescopic support legs instead of support legs Extra equipment
Hydraulic support legs when the crane is sold with a 3-point adaptor Yes/standard
No. of slewing cylinders on slewing house 4
Slewing angle 370 (360 is a complete revolution)
Slewing torque 10.4 kNm (1 060 kpm) 13.0 kNm (1 326 kpm)
Height of slewing house 290 mm
Hydraulic valve 7 slides 8 slides
Control levers 7 lever 1+1 levers with 2 functions each + 4 levers
(known as 2-lever arrangement)
Other control lever systems available Yes, extra equipment
Float position on hydraulic valve On 2 functions: boom and slewing of crane
Hydraulic valve suitable for open or closed hydraulic systems 
Closed hydraulic system for e.g. John Deere
Yes, extra equipment
Recommended pump capacity 
Lower or higher flows can be used: the crane will simply perform more slowly or faster
15-50 l/min 20-60 l/min
System pressure
Lower pressure: lifting capacity will be reduced. Higher pressure: no increase in lifting capacity, as the hydraulic system is fitted with a pressure relief safety valve.
175 bar (175 kg/cm2)
Maximum pressure 220 bar (220 kg/cm2)
Lubricatable bushings or link bearings in all joints Yes/standard
3-point adaptor for 3-point hitch 28 mm category 2, 825 mm between hydraulic arms attachment points
Weight, including grapple and rotator but without 3-point adaptor 751 kg 834 kg 992 kg 1 059 kg
Weight, 3-point adaptor 280 kg
Weight, grapple 79 kg 83 kg

All performance specifications that are pressure dependent are calculated at 175 bar pressure

Grapple lifting capacities as functions of outreach, horizontal crane arm, kg

Crane model

1.0 m 2.0 m 3.0 m 4.0 m 5.0 m 5.3 m 6.0 m 6.3 m 6.7 m 7.0 m 7.5 m
5.3 m  2 530 1 840 1 100 844 524 481 - - - - -
6.4 m 2 500 1 820 1 112 824 504 461 360 330 - - -
6.7 m 3 575 2 603 1 590 1 178 721 669 505 472 426 - -
7.5 m 3 565 2 593 1 580 1 168 711 659 495 462 416 351 243

Crane model

1.0 m 2.0 m 3.0 m 4.0 m 5.0 m 5.2 m 6.0 m 6.2 m 6.6 m 7.0 m 7.4 m
5.3 m 2 720 1 520 1 132 761 432 370 - - - - -
6.4 m 2 700 1 500 1 112 741 412 350 319 309 - - -
6.7 m 3 861 2 174 1 590 1 060 589 501 456 442 406 - -
7.5 m 3 851 2 164 1 580 1 050 579 491 446 432 396 331 223

All lifting capacities have been stated as useful grapple load, i.e. load in the grapple


Why should I buy a K.T.S Hydraulic Crane when so many others are available?
  • The K.T.S transferable 3-point adaptor makes it easy to transfer the crane between the trailer and the tractor. This enables the crane to be used for other purposes, e.g. for lifting big bags, loading fertilisers or for use as a building crane.
  • Equip the K.T.S Crane with additional digging equipment and you get a very useful digging device at a low cost, to perform less advanced tasks and supplementary work.
  • The crane may also be equipped with a cutting head with up to 5.95 m reach.
  • K.T.S creates an additional value to your timber trailer investment by offering you the possibility of using it for a variety of tasks.
  • All K.T.S Cranes are fitted as standard with a K.T.S Comfort Joint, which considerably simplifies use of the crane and makes work easier.
  • Excellent accessibility - the crane can reach timber in front of the tractor, close to the headboard or close to the support legs.
  • Cast steel slewing house, 290 mm high. This increases the distance between the bushings, thus increasing the strength of the crane for use when lifting heavy logs, hard use or when the crane is fitted with a digging head.
  • Choose the height of the crane pillar in order to make the K.T.S Crane suitable for mounting on tractors, forwarders and trailers currently on the market. 
  • Both the boom and the crane arm are made from high-strength structural steel, for high strength and consistent quality.
  • All hydraulic cylinders are mounted on the top of the crane, with all hydraulic hoses run internally. This avoids the risk of damage and resulting expensive repairs.
  • On the cranes with extensions - the 6.4, 6.7 and 7.5 m cranes - the inner section moves on adjustable bearings in order to minimise play and increase strength.
  • All pins are over-size in order to withstand high loads. All joints have either bushings or spherical bearings.
  • High lifting capacity of the grapple - suitable for heavy logs. Note that the K.T.S specification is for the net load in the grapple, while many other manufacturers indicate the lifting capacity without a grapple or rotator!
  • The very substantial box-section 3-point adaptor is also very important when the crane is fitted to the tractor's 3-point hitch. This means that the loading on the tractor's hydraulic arms and link arms is reduced.
  • The fixing point for the support legs is naturally on the centre line of the crane post, in order to ensure maximum stability of the crane while loading.
  • Full rotation of the rotator.
  • Can be fitted with a hydraulic winch, which can also be radio-controlled.
  • The grapple is made from Swedish Domex steel in order to last longer.
  • It is possible to fit plates in the grapple to make it a very useful grapple bucket.
  • Also suitable for use with tractors with limited hydraulic capacity.
  • All joints have lubricatable and replaceable bushings or link bearings.
  • Well-established company - K.T.S dates back to 1951 - means safety for you as a customer.
  • K.T.S timber trailers, hydraulic cranes and instruction manuals are CE certified.
  • Considering the above there is really no choice: K.T.S Hydraulic Cranes!

our attempts to continuously improve our products, K.T.S Maskiner and the manufacturer reserve the right to change the design and specifications of the products whenever they consider it appropriate, and without prior notification.

Reprinting of the text and pictures in this website in its entirety or parts thereof is forbidden, and offenders will be prosecuted.


Why should I buy a K.T.S Timber Trailer when so many others are available?

  • Large load area: 1.80 m2 to 2.35 m2, depending on the model. These load areas are actual measured values.
  • You can choose between telescopic or folding support legs. It is you as our customer who decide how the trailer is to be fitted.
  • Modest width requirements - 2.05 m maximum width.
  • Substantial 180 x 180mm special steel central frame. K.T.S supports full loads.
  • Fold-down support legs are made from 100 x 100 mm square-section tubes. Fastening points are reinforced in order to withstand high loads.
  • The positions of the hydraulic cylinders are well protected, in order to prevent damage by impact.
  • The hydraulic cylinders on the fold-down legs are positioned for maximum protection, while allowing maximum freedom of movement for the legs.
  • The fold-down support legs retract to a position completely inside the profile of the headboard.
  • Both the crane and the trailer have been designed by FEM analysis for maximum strength, economy of materials and low weight.
  • Hub motor operation is an option, which enables the trailer to move forward more easily under difficult working conditions. You may also use snow chains on the driving wheel or even put caterpillars onto the bogie. This is shown in a separate brochure.
  • Large wheels provide excellent load-carrying capacity, reducing the rolling resistance of the trailer and therefore reducing the load on the tractor.
  • Large, practical container for chain saw and oil container.
  • Steerable front joint as standard, increases accessibility in the forest and reduces damage to growing trees.
  • Hinged stakes protect trees from impact by unloaded trailer.
  • Larger loading space with wider supports and frame extension for a better economy when transporting brushwood.
  • Very substantial climbing box-section bogies, with single through axles carried in lubricatable bushings to ensure many years' long and problem-free operation.
  • Moveable bogie to suit different stock lengths. Note, however, that if the trailer is fitted with brakes, there is less scope for moving the bogie.
  • Generous ground clearance height increases accessibility and reduces the risk of becoming trapped.
  • First-class surface treatment ensures that your investment retains its finish, despite years of hard use and outdoor storage.
  • Well-established company - K.T.S dates back to 1951 - means safety for you as a customer.
  • K.T.S timber trailers, hydraulic cranes and instruction manuals are CE certified.
  • Considering the above there is really no choice: K.T.S Timber Trailers!


Order a very detailed colour brochure and price list free of charge! Click below!



Contact K.T.S Maskiner

Phone:      +46 19 58 50 10
Fax:  +46 19 57 42 33
E-mail:  info@kts.se