Backream - Kubota RT120Q Operator's Manual

Drill - 134

Backream

After drill bit enters target trench, the bore hole may be enlarged by changing the drill bit to a reamer and
pulling it back through the initial bore.
NOTICE: Incorrect use may damage components and increase wear.
• Do not try to increase hole size too much in one pass. Make several passes using successively
larger reamers.
• Keep drill string straight and aligned with drilling attachment. Sharp bends can cause rod failure.
• Never have more than 30' (9 m) of exposed rod outside the bore. Remove rods as necessary. See
"Remove Rod" on page 136.
Single Pass
1. Shut down tractor. See page 87 for proper shutdown procedures.
2. Remove drill bit and install appropriate reamer.
3. Start tractor and begin clockwise rotation. See page 84 for start-up procedures.
IMPORTANT: Always rotate clockwise during backreaming. Rotate counterclockwise only if drill
bit or reamer is blocked in bore.
4. Slowly drive in reverse while maintaining rotation. See page 85 for proper driving procedures. When
reamer exits the approach trench, stop rotation immediately.
Multiple Passes
1. Repeat steps 1-5.
2. Install drill bit.
3. Push drill string through bore. Do not rotate.
4. At final pass, install product. See "Install Product" on page 135.
RT120Q Operator's Manual
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