Digging Trenches With An Excavator

Digging a trench with an excavator is a fundamental skill that requires a combination of precise hydraulic control and strategic positioning. Whether you are laying utility lines, drainage pipes, or footers, the goal is to create a clean, level-bottomed channel with minimal soil collapse.

Here are the essential steps and technical tips for efficient trenching.

1. Positioning the Machine

Always dig in line with the machine. Position the excavator so the tracks are parallel to the trench path.

• Work Backwards: Always move the machine away from the area you are digging. This ensures the tracks are always on undisturbed, solid ground, preventing the heavy machine from collapsing the trench walls you just created.

• Stability: Lower the dozer blade (if equipped) to the ground. This acts as a stabilizer and prevents the machine from rocking forward during heavy prying.

2. The Digging Technique

Efficient trenching is about a smooth "curling" motion rather than just pulling.

• The Pull: Reach the arm out, set the bucket teeth into the soil, and pull the arm toward the cab while simultaneously curling the bucket.

• Leveling the Bottom: To get a flat bottom, you must coordinate the boom and arm. As the arm moves toward you, slightly raise the boom to keep the bucket at a consistent depth.

• Side Walls: If the soil is loose, avoid making the walls perfectly vertical. A slight "V" taper helps prevent cave-ins.

3. Spoil Pile Management

Where you put the dirt is just as important as how you dig it out.

• The "Bench": Keep the spoil pile at least 2 to 3 feet away from the edge of the trench. If the pile is too close, the weight of the excavated dirt can cause the trench walls to slide back in.

• One-Side Placement: Place all dirt on one side of the trench to keep the other side clear for foot traffic or pipe staging.

Equipment and Attachments

The width of your trench is determined by your bucket size. Selecting the right bucket ensures you don't move more dirt than necessary.

• Trenching Buckets: These are narrow (usually 12" to 18") and feature a deep profile to carry more material per cycle.

• Hydraulic Thumbs: Extremely helpful if you encounter large rocks or tree roots that need to be plucked out of the trench path.

Safety First

• Call Before You Dig: Always have underground utilities marked before breaking ground.

• Trench Shoring: If a trench is deeper than 5 feet, OSHA regulations generally require shoring, shielding, or sloping to protect anyone entering the trench.