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Many variables dictate what trencher configuration is best suited for the task, including depth of cut, length of run, size of the product being installed, local ground conditions and space on the jobsite. You must start with the correct size machine - whether it's a walk-behind or ride-on unit with wheels or tracks - then choose the correct chain, cutting teeth and boom configuration. Next, select attachments that maximize your productivity.

Ground conditions and trench dimensions dictate the correct trencher size. "The more difficult the soil conditions, the more powerful the trencher should be," says Tim Phelps, product manager, Barreto Mfg. The depth and width of cut also affect trencher size. "For example, the deeper and wider the trench, the more earth you are taking out of the ground and the more power and size you want in your trencher to make the job easier."

Length of runs and frequency also affect choice, he adds.

When it comes to trenchers, bigger isn't always better. "You can rent a larger machine and get the work done faster, but it will cost you more. So you have to consider the budget as well as the application," Phelps states. "You also have to consider the size of the area. A smaller trencher is easier to maneuver than a larger one, and easier to transport to the jobsite."

Sizing it up
The smallest of the horsepower range is filled with walk-behind trenchers. "Walk-behind trenchers are limited in dig depth and width," says Bob Wren, training manager, Astec Underground. "However, they play a large role in the total unit sales of rubber-tired trenchers. Walk-behinds may be as much as 50% of the overall market in the 10- to 115-hp range."

According to Jon Kuyers, rubber tire and compact segment manager, Vermeer Mfg., "Most walk-behind trenchers effectively trench 24 to 48 in. deep and 4 to 6 in. wide. They are somewhat limited, as they do not have backfilling capabilities, and are smaller in size and horsepower for tough conditions.