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     December 1996 January 1997

Tech Update: Cable Yarding Systems

A review of the different cable yarding systems that are available on the marketplace.

By Mel-Lynda Andersen
Copyright 1996. Contact publisher for permission to use.


Koller USA Corp.

Koller USA offers a complete line of small yarders and carriages for today�s changing forestry requirements. Their simple design makes them quick to set up and easy to operate, and their low operating cost and high machine reliability translate into increased profits, says the manufacturer. Koller carriages operate through mechanical linkage. The company claims that having the ability to pass intermediate supports also makes Koller carriages very versatile.

Specifications of the K300 include skyline capacity of of 1,200' of 5/8'', mainline capacity of 1,200' of 3/8'', haulback line capacity of 2,100' of 5/16'', and guyline capacity of 100' of 5/8''. Line pull for the skyline is rated at 9,700 lbs. in tensioning compartment; line pull for the mainline is 4,000 lbs. at medium drum, at a line speed of 985'per minute. The lattice-design steel tower is 23' tall with optional 5' extension.

K501 specifications include skyline capacity of 1,600' of 3/4'', mainline capacity of 1,800' of 1/2'', haulback line capacity of 2,900' of 7/16'', and guyline capacity of 145' of 3/4''. Line pull for this unit is rated at 15,900 lbs. in tensioning compartment for the skyline, and 8,100 lbs. at medium drum for the mainline. The mainline operates with a line speed of 1,000' per minute. The steel square tube design tower is 33' tall.


New from Parker Pacific, the Diamond D210 swing yarder has the power to handle clearcuts and the speed, mobility and versatility to profitably work thinning sales, says the company. With machines presently working in Washington, Oregon and BC, a small crew operating the Diamond D210 are said to out-perform bigger machines with bigger crews. The drive system consists ofa Cummins 6CST8.3C, 12-volt electrical system and a Funk 2000 powershift transmission with six forward and three reverse gears.

Inline drums are driven by gear-mounted plate clutches with Eaton water-cooled tension brake and air-operated auxilliary band brake. Skyline capacity is rated at 2,400' of 3/4'' and 2,000' of 7/8''; mainline capacity is 1,800' of 5/8'', mainline as haulback at 4,000' of 7/16''. The weight of this unit is approximately 70,000 lbs.


Madill's 124 swing yarder is powered by a Detroit Series 60 12.7L 450-hp, turbo-charged engine with a 450-hp rating at 2,100 rpm. An Alison HD 4060 fully automatic shifting transmission has auto lock-up torque converter and five-speed forward. Front main and rear main drum capacity is 2,550' of 7/8'' with grooved drum; pull is 92,000 lbs. at 4,200 ft./min. Haulback drum capacity is 4,600' of 7/8'' with grooved drum; pull is 93,000 lbs. at 5,950 ft./min. Strawline capacity is 5,440' of 3/8''; pull is 16,000 lbs. at 11,000 ft./min.

Boom hoist capacity is 360' of 3/4''; pull is 8,500 lbs. at 165 ft./min. The system has two guylines with a capacity of 225' of 1-1/8''; pull is 8,500 lbs. at 165 ft./min. Lattice contstruction boom is 60' long. The rear-entry cab provides exceptional visibility, says the company, and has yarding controls in the armrests, as well as hydraulic cab tilt.

Thunderbird SLR

New from Thunderbird is the TSY-6140SLR yarder, combining slackline yarding with a running skyline yarding system, thus producing two machines in one.

This yarder is capable of operating skycars, MSPs or grapples. With zero tail swing and the combination yarding system capabilities, the new Thuderbird SLR does it all, even in small spaces, says the manufacturer. The zero tail swing design confines the swing within the track width and makes it ideal for tight logging situations. A boom height of 41' provides the necessary lift while a Cat 3126 rated at 230 hp and hooked up to an Allison four-forward, 1-reverse transmission provides the power.

The TSY-6140SLR comes standard with a Thunderbird Hi-Vis fully equipped cab, SLC single-lever controls and 100 per-cent visibility when downhill logging. Three drums are arranged in a waterfall configuration with Eaton water-cooled brakes and ITAC clutches.


Enviroquip Sales Ltd. (EQ) of Courtenay, BC has imported the first Urus 1 Uni 300 skyline yarder into Canada. The Urus is manufactured by Hinteregger of Austria and South Africa and has been field-tested on Vancouver Island. Accor-ding to the distributor, the Urus features all the attributes of a typical production yarder, such as line speed and pulling power, with the added advantage of compact size. With a selling price of $110,000 Cdn., complete with simple carriage, cables and all accessories, this unit is priced very competitively, says EQ.

The model demonstrated on Vancouver Island was a trailer-mounted package with a 34' tower, 100-hp Cummins diesel engine and three-speed Allison automatic transmission. The yarder was demonstrated along with a Stuefer HSK 2000 carriage priced at $30,500 Cdn., complete with a hydraulic time-delayed skyline clamp.

The Urus yarded approximately 300 metres over one intermediate support in a second-growth thinning. The thinning demonstration was not in operation long enough to collect meaningful piece averages; however, the highest daily yarding total was over 300 pieces estimated at 110+ cubic metres.

Pacific Manufacturing

The SY1088 mobile swing yarder from Pacific Manufacturing is equipped with a Caterpillar model 3406 diesel engine rated at 360 hp, coupled with a twin disc TD 44-1131 transmission with four forward and four reverse speeds. RPM is rated a 2,100 with main drum pull capacity to 51,000 lbs. Pacific Manufacturing's mechanical interlock system with disc clutches have been developed as a unit moving in one piece, enabling the A-frame to be quickly raised or lowered.

Maximum line speeds are rated up to 2,650 fpm on the mainline and 3,160 fpm on the haulback. Mainline drum capacity is 2,000' of 3/4''; haulback capacity is 4,000' of 3/4''. According to the manufacturer, the model SY1088 can reach farther with greater speed and efficiency. This system can be adapted for running skyline, gravity or highlead system. It operates with a dropline carriage or a grapple. You can move from one setting to another in minutes on a Caterpillar crawler-type undercarriage, says the company.

TLD Gauthier Inc. OSB

Since 1986, TLD Gauthier Inc. from Saint-Gilbert, Quebec has developed a new concept in cable logging. The Telecarrier TL-3000 system is self-propelled and remote-controlled and travels on a single cable. The system is capable of logging in mountainous terrain over 100 per-cent slopes with operation distances of up to 500 metres.

The TL-3000 also performs well over swampy areas, according to the manufacturer. The unit moves quickly and holds charges of up to 3,000 kg. Presently operating in BC, New Brunswick and Quebec in Canada, as well as in the US and Chile, this machine features short setup time, is easy to operate (requiring just three operators), and is economical to install. The TL-3000 cable yarder functions well in mills and is profitable for logging contractors, says the company.

December 1996 / January 1997 Table of Contents

Evans cited as first code victim
Soaring stumpage fees and Forest Code-inflated logging costs forced Evans Forest Products to its knees. Other mills could be facing the same fate.

Timber Sales Fund Innovative Harvesting Training Program
Eighteen people are learning new harvesting techniques.

Riding the OSB boom
Hedging against a downturn, Weyerhaeuser invests $16 million to improve recovery at its OSB plant at Slave Lake, Alberta.

Cost conscious cut-to-length
Setting up a new CTL show in remote northern Manitoba, Art Riemer wanted dependable equipment - but not at a price that would turn his accountant surly.

Sticking in a Tough Market
At Fort Nelson, the world's largest chopstick plant produces eight million units a day for demanding Japanese buyers.

CCMC Furthering Aspen as a Commercial Species in BC
CCMC is a pioneering company making exclusive use of high-quality aspen.

Tech Update: Cable Yarding Systems
A review of the different cable yarding systems that are available on the marketplace

Helicopter Logging Capability Guide
Heli-logging remains a practical harvesting alternative in many of British Columbia's mountainous regions.

The Eagle Flies
At the site of an abandoned chip mill in Miramichi, Eagle Forest Products turns the key on a new $100 million OSB plant.

New Centre Targets Value-Aded Training
With an estimated 30,000 skilled workers needed in the value-added sector in BC by 2001, the industry has moved to address a potentially serious training shortfall.

Haliburton: A Multi-Use Model
Ontario's Haliburton Forest, a popular recreation site, also hosts extensive forestry research and education programs - and a unique 'one stem at a time' selective logging program.

Yard Handling and Storage Critical to Aspen Quality
Few mill yards contain a fridge for wood, a fibre source to keep a manufacturing plant in business when green production is curtailed.

Northern Mills Address Need for Added Kiln Proficiency
The added market value of kiln-dried lumber is driving a push for new technology and added training for operators.

Supplier Newsline
Trade magazine ads pay off.


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Last modified 12/18/96

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