OPERATING INSTRUCTIONS
M-1735 11-15-13-2
All three auger drives dig the same except the 8K2 has an additional two speed “shift on de-
mand” feature.
8K2 TWO SPEED AUGER DRIVE:
An increased demand on the auger drive will cause the pressure of the operating vehicle to in-
crease. When the pressure of the prime mover exceeds 2500 PSI (preset) the 8K2 motor will automati-
cally shift to maximum displacement, which reduces the speed of the auger and increases the torque.
When the pressure decreases and goes below 1000 PSI the motor will shift back to minimum displace-
ment which will increase the speed of the auger and decrease the torque.
OPERATION
1.
After all installation instructions have been completed, safety information read and understood,
and the rest of this operator’s manual has been reviewed, your McMillen Hydraulic Earth Drill is
now ready for use.
2.
With the auger raised off the ground and the vehicle engine set at a low RPM, activate the earth
drill control valve to determine which position the control valve lever must be in to turn auger in
a forward (clockwise) rotation. This is the “digging” position.
3.
Before beginning to dig, experiment with auger speed to determine a suitable auger RPM. Gen-
erally in light and sandy soil a high RPM is desirable. In hard, rocky, or frozen soils a slower
RPM is desirable. To increase auger RPM, increase vehicle engine RPM. To decrease auger
RPM, decrease vehicle engine RPM.
4.
Return earth drill control valve to neutral position to stop the auger. Lower the auger to the
ground so that only the center point penetrates the ground about 2” (51mm).
5.
Activate the earth drill control valve so auger is turning in a forward (clockwise) rotation. Use
only enough down pressure to assure positive penetration of auger into the ground. Ease up on
down pressure if auger rotation slows down drastically or stalls.
NOTE: Excessive down pressure will cause the auger to stall frequently.
6.
When auger has penetrated the ground about 24” (610mm), raise the auger from the hole to
clean the dirt out. Repeat this procedure until the desired hole depth is obtained.
7.
Once the required hole depth is reached, allow the auger to turn a few seconds at this depth to
clean the hole.
8.
Return the earth drill control valve to the neutral position to stop the rotation of the auger. Raise
the auger out of the hole, move away from the hole, then activate the earth drill control valve to
spin the loose soil off of the augers.
NOTE: Do not reverse the auger rotation to remove from the hole as loose soil on the auger
flights will fall back into the hole.
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