logging truck

A logging truck or timber lorry is a large truck used to carry logs. Some have integrated flatbeds, some are discrete tractor units, and some are configured to spread a load between the tractor unit and a dollied trailer pulled behind it. Often more than one trailer is attached.

History

The most convenient trees to cut down were those near waterways for easy transportation. As the supply dwindled and loggers had to go farther from water, they used teams of oxen or horses for hauling. These were superseded by steam-powered donkeys and locomotives. The final development was the logging truck.

A truck was used for logging in Covington, Washington, in 1913. The coming of World War I and the resulting demand for the Pacific Northwest's Sitka spruce for airplanes "established log trucking in Washington". The United States Army assigned thousands of men to the Spruce Production Division to build roads into western Washington to harvest the dispersed stands of the best trees. After the war ended, a plenitude of surplus military trucks made their adoption attractive to logging companies, particularly smaller outfits that could not afford expensive locomotives.

The primitive trucks were improved in the 1920s and 1930s, with more powerful engines and better braking systems. The old "narrow, solid rubber—sometimes steel—treadless tires" were replaced by wider pneumatic ones with treads. Plank roads gave way to graded dirt ones. By the mid-1930s, trucks were hauling as much timber out of the Pacific Northwest as the railroads.

World War II saw improved truck designs, and once again these were passed along to logging companies through the sale of surplus military vehicles after the war was over.

Configuration

There are two main types of modern logging trucks—those used on rough ground and trails in the forest where they are felled and those used for transport on normal highways and roads. Because the roads in forests are rough and often temporary, the suspension and tires of an offroad truck are especially significant. Solid, low pressure and high pressure tires have been used. As many as nine axles may be used to provide low ground pressure and good traction.

Timber is commonly grown in hilly country unsuitable for farming and so the ability of a log truck to climb a gradient is significant. The steepness depends on the quality of the surface - mud and snow are harder to climb than gravel and soil. For a manageable gradient, the speed will then depend upon the power of the truck. The legal weight limits will vary by jurisdiction but, for example, in the southern states of the US, they range from —about .

To load the logs, the truck may be fitted with one or more winches or cranes. The logs are commonly unloaded by letting them roll off sideways.

Gallery

File:Logging truck - Shaw Island ferry dock 01.jpg, Logging truck on Shaw Island ferry dock
File:LOGGING TRUCKS MOVE THROUGH PARK FROM CUTTING NEAR PARK BOUNDARY - NARA - 542858.jpg, Logging trucks move through park from cutting near park boundary
File:Logging truck and bush taxi accident.jpg, Logging truck and bush taxi accident
File:Logging truck - geograph.org.uk - 902724.jpg, Three axle KrAZ-255B logging truck
File:Wood exploitation in Finland 2.jpg, Sisu with a hydraulic crane
File:Volvo lumber truck Finland.jpg, A 60 ton Volvo FH16 with bullbar
File:Logging Port Chalmers.jpg, Mitsubishi 8x4 unloaded in Port Chalmers, New Zealand
File:Truck load of ponderosa pine, Edward Hines Lumber Co, operations in Malheur National Forest, Grant County, Oregon, July 1942.jpg, Truckload of ponderosa pine, Malheur National Forest, 1942
File:Lolo_Hot_Springs,_Lolo,_MT,_2011_3.jpg, Straight truck with log loader and pup trailer, Montana, 2011
File:Arrivée d'un grumier dans le clos de l'entreprise des Frères Allot.jpg, French logging truck

See also

* Flatbed truck
* Hayes Truck
*Forwarder
* Logging road
*Pacific Trucks
* Side stake

References

External links

Log Truck
— the site of New Zealand's Log Transport Safety Council

The Washington Log Trucking Industry: Costs and Safety Analysis

Transport Canada regulations

Transport Alberta regulations

{{Forestry tools

Logging
Trucks
Forestry equipment