RT120Q Operator’s Manual Drill - 129
Set Up
Dig Target Trench
1. Select a completion point for the bore.
2. Dig a target trench (2) across the intended completion point.
Install Drill String
1. Assemble at least 20’ (6 m), but not more than 30’ (9 m), of drill rod sections.
2. Install drill bit to the cutting end of the drill string.
3. Put drill string in approach trench and align with intended bore path.
4. Start engine and set to low throttle. See “Start Unit” on page 84.
5. Lower boom in parallel position to ground.
6. Move machine toward approach trench. See “Drive” on page 85.
7. Shut down engine. See “Shut Down” on page 87.
8. Install drilling attachment to backfill blade.
9. Connect hydraulic lines.
IMPORTANT: Ensure that target trench is:
• deep enough for drill bit to enter slightly above the trench floor, and
• long enough to allow for drift of unguided drill string. Accuracy of bore decreases with length
and varies with soil conditions.
NOTICE: Incorrect installation can cause rod sections to bend.
• Ensure more than half of drill string length is inside trench.
• If necessary, remove rod sections or increase length of trench.
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