The Pendulum Arm Technology on 101
Welcome to check out the technique, history, specs, pictures, videos, test results, scientific articles, and other links about the most well described and photographed forest machine. The Xt28 forwarder can be operated with a car driving license, remote controlled or autonomous operated.
video
Improved Operator Comfort and Off-road capability through Pendulum Arm technology
The comments are in Swedish!
Video
Autonomous Terrain machines
Closer than we believe?
Xt28 was the 1st forestry machine ever performing autonomous drive on uneven terrain!
video
UMIT Research Lab
Simulation and test of AI controls (Under development)
Myths confirmed or busted by the Xt28
You do not build a forestry tractor just like that, but if
you listen carefully and follow your conviction it helps. However, it takes
time and a lot of money. The picture is from Jälla Estate outside Uppsala 2014 with the builder in
the foreground. Lars Lameksson built the Spider (487) with pendulum arms in 1986. The Xt28 was completed 28
years later. The 2nd
attempt building the 8th Pendulum Arm Forwarder with six pendulum arms ever.
With an engine performing up to 280 Hp
and a transmission yielding maximum traction force above 280 kN or 28 metric
tonnes. Overall width less than 28 dm with
750 tires. An eXtreme tractors given nomenclature: Xt28. Scroll down for more information about myths confirmed or busted.
Brief Specs Xt28
Engine: Agco power 84CTA-4V (Sisudiesel)
Output: 275 HP Torque: 958 lbsf.ft @ 1500 rpm
Operating weight: 37250lbs
Pay load: max 30900 lbs
Rim pull: 64000lbs
Travel speed: 0-15 mph
2x articulated steering joints, 6 wheels on pendulum arms.
Outer turning radius: Load bunks 20 ft, wheels 18 ft
Ground clearance: 12.2-51.4 in
Overall width: 110 in w/ 29.5 in tires
Load bunks: Adjustable width: 8.2-8.85-9.5ft
Loader: Loglift F91F79 , Lifting capacity 2425lbs @ 26ft
Bosch Rexroth control system and hydraulics
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History
on pendulum arms applied to terrain machines in Sweden
ÖSA 270 forwarder
was made in one specimen and tested in 1973. Mighty impressive for its time, always keeping operator station and load levelled in side slope situations. The forest companies who often bought several of newly developed machinery in their taste, thought this was an overkill. Consequently the 270 base was equipped with the 705 delimbing/cutting unit and became a “bad boy” in slopes together with the 670 feller/buncher. Then came the oil crisis, ÖSA 260, double-grip harvester, etcetera. Press the buttons below to learn more about ÖSA and you will be taken to the ÖSA Historical Association homepage or Facebook.
History
The ÖSA 670 feller buncher
Was then and still is an extremely impressing creature launched in 1973. Followed by a processing unit or delimber/cutter with an extra diesel engine and a couple of forwarders made a Cut-To-Length machine group. Pendulum arms with built-in chain transmission and mercury switches coupled to the cylinders for automatic levelling upwards.
History
LL-Trollet 2000
Lars Lamekssons LL-maskiner in Trollestorp, Ljungby
LL-maskiner has manufactured machinery since 1968 and in pendulum arm terms the Spindeln, translates to the Spider, a 4 wheeled harvester launched in 1987, is the most well-known. Predecessor for Skogsjan 487, 495, 695 and later Caterpillar 550-580 and today Ecolog’s 500-serie harvesters. The 1086 and 1088 forwarders has a similar story.
At Elmia Wood 1989 the LL-Trollet 2000 had its premiere. Six pendulum arms pointing forward jeopardized the weight distribution fully loaded. Swapping pendulum arms aft made the difference. Two more machines were sold and built, still going strong with more than 40,000 hours on the meter. Two upscaled Trollet BIG were customized as wood chip shuttles. An application perfect for pendulum arm machines. If the machine needs to move inches or a few feet making sure the chips ending up right, the machine can be tilted, saving minutes every turn.
History
Skogsjan 2000 Soft
Double articulation = Soft
The cooperation between Skogsjan and LL-maskiner has solved numerous challenges. A patented hydraulic assembly between the pendulum arms maintains equal pressure without any energy supply. The articulation joint under the load bunks eliminating the shear between the axles is a Skogsjan solution. Some were disrupted over the transversely engine mount but missed the easy service access. Observe the aft pendulum arms pointing backwards.
history
Skogsjan 2000 Soft
1995 the second edition
A more powerful and impressing Skogsjan 2000 Soft appeared. Simultaneously the Skogsjan 695 harvester took off with 40-50 units sold in a few months. The “bad boy” harvester needed a companion. A bit of "ÖSA-system" thinking but lack of resources pushed back the forwarder part. Anyway, these machines convinced Caterpillar about the fact the Cut-To-Length system was the best way in forestry and Caterpillar Inc. acquired in March 1997 all assets of Skogsjan Ab.
History
Timberking LF 14
After some half-hearted attempts within Caterpillar the development of the pendulum forwarder ended up in Australia, where hardworking engineers reconstructed and built this Log Forwarder 14 (ton) based on the disassembled 2000 soft. The LF14 made it to the Elmia Wood 2001 Forestry Fair, static displayed under the newly purchased Timberking brand. Savings on performance was on the contrary to Skogsjans conception. After homecoming down under the machine was driven, tested, certified and later on, donated to a technical training school where it was dismantled.
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Contact information
eXtractor Ab, Höglundagatan 3, 82134 Bollnäs, Sverige
+46 70 574 9507
Mon-Fri: 8 am-6 pm,