D7x11 Series II Navigator Directional Drill Supplemental Operations 55-17
Replacing Broken Drill Rod Underground
Step 1: Retract drill string back to the drill unit until broken rod exits the ground. Keep track of the length of
drill rod retracted so you can determine the location of the underground break. Use power vises on
machine to break the joint and remove broken rod.
Step 2: Dig to the break location underground.
Step 3: Use a compact remote power breakout device to loosen joint of broken rod in the ground. Use a pipe
wrench to finish removing broken rod.
Step 4: Install drill rod hole guide, such as a “football” or “balloon”, onto drill rod at the machine. Push it
through pilot bore to the drill string still in the ground.
Step 5: Follow “Lockout Procedure - With Remote Lockout,” page 30-11, or “Lockout Procedure - Without
Remote Lockout System,” page 30-13.
Step 6: Remove football/balloon.
DANGER: Rotating drill string can kill. Unexpected start-up possible.
Lock out before working on drill string.
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