Toro 25545T Operator's Manual page 55

Drill (continued)
Backreaming the Hole
Sometimes it is necessary to drill a pilot hole first, then enlarge the hole to accommodate
larger product. As a general rule, the final hole should be 1.5 times larger than the diameter
of the product being installed. The number of passes needed depends on the soil
conditions.
1. With a shovel, carefully dig
boring bit, in the target trench
soil until it can be removed.
2. Turn off the machine.
3. Remove the boring bit and attach the
backreamer
4. Attach the product being installed to the swivel
on the end of the backreamer.
Note:
drilling or at final pass of backreaming.
5. Start the machine and push the control lever
forward to start the reamer.
6. Slowly move the machine rearward as the reamer digs into the soil.
Do not drive too fast, forcing the backreamer into the soil. Allow the reamer to
progress at its own rate. Do not push or pull the backreamer through the soil when
the drive head is not turning.
7. When the rod coupling is about 15 cm (6 inches) into the approach trench or when the
backreamer completely enters the approach trench with about 15 cm (6 inches) of the
cable or piping, stop the machine, pull the control lever into neutral, and turn off the
machine.
Note:
rods as necessary.
3467-222A
.
Pull product through the bore after
Do not have more than 9 m (30 ft) of exposed rod outside the bore. Remove the
around the
, clearing it of
g008478
IMPORTANT
Page 5–18 Operation: During Operation