Log Max 4000T

The Log Max 4000T, our latest thinning head has impressive pulling force and high speed feeding.


This head has an entirely new frame construction where the saw box has been moved backwards and outwards, the higher part of the frame inched forward reducing friction and clogging in the measuring wheel.
The new hydraulics layout greatly improves power and feeding speed making this 833 kg* harvesting head the ultimate choice for thinning and lighter final cuts.


This powerful thinning head comes equipped with the first-generation Log Max 218 and 318 True-Cut saw units with up to 58 cm of cut capacity.


All these features combined with Log Max patented knife control system, which minimizes feed friction, provides outstanding stem coverage and increased log quality.

Harvesting key figures
  • Most productive range : 15 to 35 cm
  • Maximum cutting diameter : 58 cm
  • Minimum delimbing diameter : 1,2 cm
  • carriers carriers carriers
  • 13-18 tons 13-20 tons 130-160 kNm
  • cut stump


  • Max width arms open1185 mm
  • Min width with arms closed1035 mm
  • Height to felling link 1426 mm
  • Standard configuration1777 kg
  • 1) Incl: V-Steel rollers, damped protection plate
    +56 kg with AV12S rotator = 833kg


Hydraulically driven chain saw with pressure controlled feed force.
Chain oil tank in frame with 4 liters capacity.

  • Standard saw:
  • Saw type (man. tens.) 218
  • Saw type (auto. tens.) 318
  • Saw motor 19 cc
  • Saw chain 0.404 pitch
  • Bar length, 60/67 cm
  • Maximum cut capacity std/opt49/58 cm
  • Optional saw:
  • Saw type (man. tens.) 218 True-Cut
  • Saw type (auto. tens.) 318 True-Cut
  • Saw motor 19 cc
  • Saw chain 0.404 pitch
  • Bar length, std/opt 60/67 cm
  • Maximum cut capacity, std/opt 49/58 cm


Two hydraulically driven rollers mounted directly on radial piston motors, 398 cc / 24.3 cu.in.

  • Feed roller diameter, V-Steel 350 mm
  • Feed roller diameter, V-Steel Aggressive 350 mm
  • Calculated feed force1 398cc 20,3 kN
  • Calculated feed speed2 5,0 m/sec
  • Maximum roller opening 460 mm
  • Minimum roller opening 12mm
  • 1) calculated at 250 bar pressure
  • 2) calculated at 210 l/min flow


Four movable knives with patented positioning to minimize friction losses, which increases the active pulling force.

  • Max delimbing knife opening 517 mm
  • Max full coverage delimbimg diameter1 350 mm
  • Min full coverage delimbing diameter 12 mm
  • 1) Note includes bottom knife


  • Maximum pressure 280 bar
  • Maximum flow 240 l/min
Min. requirements for acceptable performance :
  • Flow 200 l/min


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  • Indexator AV12S with 360˚ rotation
  • Indexator H132 with 360˚ rotation


v-steel rollers  


By placing the stud bars in angled rows, Log Max has obtained a self cleaning feed roller with very high pulling force both in forward and reverse, without risk of spinning.

v-steel aggr. rollers  

V-Steel Aggressive

The V-steel Aggressive roller has studs that sink deeper in the tree trunk.


  • truecut

An impressive new saw unit - the Log Max True-Cut


The Log Max 4000T feature the first generation 318 True-Cut and 218 True-Cut, both saws have a 19cc motor, the 318 has automatic chain tensioning the 218 has manual tensioning.

The key component of the True-Cut system is the intelligent saw motor with integrated valving solutions for saw motor speed and saw bar control. By continuously sensing the motor speed and adjusting the saw bar feed rate accordingly, the True-Cut maintains an almost constant chain speed of 40 m/s throughout the cutting cycle. This yields an impressive cutting performance - the True-Cut is up to 35 % faster than conventional saw units! By locating the valve for motor speed control inside the motor it is able to react instantly to changes in motor speed and practically eliminate any over-revving that is seen in a convention- al saw unit. Not only does this reduce the stress on the motor but it also provides a safer work environment by reducing the risk of chain shots. The True-Cut saw units also features a longer stroke cylinder and a higher resolution cutting con- trol sensor. These additions provide for a more precise control of the saw bar resulting in maxi- mized cutting performance and color marking precision. The True-Cut is optimized at the factory and should not need any further setting changes in the field.


Accumulation kit


This allows the head to be used as a combination head - both as a conventional harvester as well as a multi-stemming head for thinning small wood or in late brush cuttings.


The Log Max Accumulation Kit can be run with Log Mate 500, 402, Motomit, CabsWin, Dasa 380, Ponsse Opti, Timbermatic and Komatsu Maxi.

  • multi-stemming


Active Friction Control


The new generation floating top knife featuring Active Friction Control actively controls and adjusts the amount of friction between the log and the harvesting head's frame. There is no need to go out and change the settings by adjusting the unit, everything is now set automatically. Low friction is desired as it leads to lower fuel consumption and heat generation. There is the exception of when delimbing heavily branched trees with small diameter limbs a higher friction minimizes the risk of simply bending them flat.

The harvester's computer is the brain of the Active Friction Control and based on your settings, the Log Max head behaves optimally depending on tree species and diameter. For example, a thinning of pine and birch can behave quite differently based on tree species.

  • active friction control


  • Field repair kit
  • Stump treatment
  • Color Marking
  • Snow cover
  • Auto Chain tensioner (318)
  • Fixed protection plate
  • Rotator control
  • Rod cover
  • Find end sensor