Abstract: A trenching machine comprising a wheeled frame and a first motor mounted on the frame is provided. The first motor drives a digging chain carried on a chain guide extending from the machine. The chain guide is pivotally mounted coaxially with a drive chain drive sprocket. An actuating arm for pivotally moving the chain guide relative to the frame, a lock to lock the chain guide in a desired pivotal position, and a second motor mounted on the frame, are also provided. The second motor drives at least one of the machine wheels for moving the machine along the ground. The second motor is releasably engaged to at least one of the machine wheels.

Abstract: A trenching machine (10) comprising a wheeled frame (12) and a first motor means (18) mounted on the frame (12). The first motor means (18) drives a digging chain (16) carried on a chain guide (74) extending from the machine (10). The chain guide (74) is pivotally mounted coaxially with a drive chain drive sprocket (82). A means (102) for pivotally moving the chain guide (74) relative to the frame (12). a locking means (102, 104, 105) to lock the chain guide (74) in a desired pivotal position, and a second motor means (18) mounted on the frame (12), are also provided. The second motor means (18) drives at least one of the machine wheels (14a, b) for moving the machine (10) along the ground (G) The second motor means (18) is releasably engaged to the at least one of the machine wheels (14a, b).