Trenchers

Trenchers cut narrow trenches for cable, fiber, irrigation, drainage and pipe. The exposed digging chain can grab clothing, boots and limbs in an instant, and the machine can easily cut through buried gas, electric and fiber lines. Walk-behind trenchers are often rented and run by people with little training.

• Construction
• Utilities
• Landscaping

Types of trenchers

• Walk-behind chain trenchers: small machines for irrigation and landscape lighting, often rented.
• Ride-on chain trenchers: larger machines with a boom that digs deeper and wider; often combined with a vibratory plow or backhoe attachment.
• Wheel (rock) trenchers and micro-trenchers: cutting wheels for rock, pavement and narrow fiber slots in roads.
• Trencher attachments on skid steers and compact track loaders.

Before trenching

• Call 811 and wait for the marks. Private lines (irrigation, landscape lighting, gas to a shop or pool) may need a private locator. See Call 811.
• Hand dig or vacuum excavate to expose lines at crossings and within the tolerance zone
• Chain, teeth, sprockets and guards in good condition; chain tension correct
• Operator trained on the specific machine and has read the manual
• Operator presence control (the handle or seat switch that stops the chain when released) works
• Ground checked for slopes, soft spots, rocks and drop-offs
• Area cleared of people, pets and loose objects

Operating

• Keep everyone at least as far away as the manual says from the digging chain and the spoil auger. Mark a clear zone if others are nearby.
• Wear close-fitting clothing; tuck in or remove anything loose, including hoodie strings and gloves with cuffs that can catch.
• Lower the boom slowly into the ground before engaging travel.
• Watch slopes; walk-behind trenchers can pull or tip. Trench up and down slopes when the manual allows, not across.
• Stop the engine and lower the boom before clearing debris, adjusting the chain or leaving the machine.
• Wear hearing protection, safety glasses and boots.
• Treat trenches 5 feet or deeper as excavations needing protection. See Trenching.

• Don’t bypass the operator presence control or tie down the handle.
• Don’t clear a jam with your hands or a shovel while the chain can move.
• Don’t walk backward with a walk-behind trencher toward obstacles, holes or traffic.
• Don’t trench in the tolerance zone of a marked line with the machine.

If you hit a utility

Stop the machine. If it’s gas, shut off the engine if safe, leave the area on foot, keep people away and call 911 and the gas company. If it’s electric, stay on the machine if you can and warn others away. See What to Do After a Utility Strike.

Loading and transport

• Load on a level surface with ramps rated for the machine’s weight.
• Raise the boom so it clears the ramps, and go slowly.
• Chain the machine down at the tie-down points. See Trailers & Towing.

Last updated: October 1, 2026