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OPERATION
PHDHF / PHDHC 03/20
Operation Section 4-15
© 2020 Alamo Group Inc.
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7.1 Digger Operating Instructions
1. Spot auger pilot over mark where hole is to be drilled. LOCK POWER UNIT BRAKES - if power unit rolls
forward or backwards with auger in the ground, the auger, gearbox, or hitch may be damaged or broken.
2. With auger raised off the ground less than 12”, and the power unit engine set at a lower RPM, activate the
digger hydraulic control valve to determine position control lever must be in to turn auger in forward
(clockwise) rotation. This is the “digging” position.
3. Before beginning to dig, experiment with auger speed to determine a suitable auger RPM. Generally in
light and sandy soils a high RPM is needed. To increase auger RPM, increase the power unit engine RPM.
To decrease auger rotation speed, decrease power unit engine RPM.
4. Return digger hydraulic control lever to neutral position to stop the auger rotation. Lower the auger to the
ground so that only the center point penetrates the ground above 2”.
5. Activate the hydraulic control lever to digging position to start auger 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.
6. After the auger has penetrated the ground about 24”, raise the auger from hole to clean dirt out. Repeat
this procedure until the desired hole depth is achieved. Allow auger to turn a few seconds at this depth to
clean the hole.
7. Return digger hydraulic control valve to the neutral position to disengage the auger and stop rotation. With
auger at a complete stop, raise auger out of the hole, move auger away from the hole, and re-engage to
spin loose soil off the auger flighting.
NOTE:
Do not reverse the auger direction to remove the auger from the hole as loose soil or the auger will
fall back in the hole.
8. If necessary, repeat steps 6 and 7 to obtain a cleaner hole.
9. In some digging conditions or when excessive down pressure is applied, the auger may “screw” itself into
the ground and become stuck causing the digger to stall. When this happens, reverse the auger rotation
(move hydraulic control lever in opposite direction so that auger turns counter-clockwise) and slowly raise
the auger out of the hole. Once unstuck, return the control valve lever to the forward rotation position to
resume digging.
If the auger becomes lodged under rocks, roots or other large obstruction, do not attempt to raise the auger
out of the hole. The auger must be rotated in the reverse direction to unscrew the flighting from the
obstruction.
10. If the auger hits and becomes lodged with a large obstruction, the power unit hydraulic relief valve will open
and bypass the oil to stall (stop) the auger. This does not damage the digger or power unit in any way but
serves as an overload protection device. When this happens, simply reverse the auger rotation and slowly
raise the auger. The relief valve will reset automatically, and the drilling operation can be resumed.
11. Avoid excessive shield loading to the auger and drive motor which can cause drive unit, auger and hitch
damage.
12. Keep auger teeth and points in good condition. Check condition frequently and always keep spare teeth
readily available so that worn and missing teeth can be replaced as detected to avoid damage to tooth
holders and auger flighting.
Summary of Contents for PHDF20-2
Page 4: ...STORAGE 5 3 HYDRAULIC LINES COUPLERS ADAPTERS 5 4 PROPER TORQUE FOR FASTENERS 5 4 ...
Page 5: ...Safety Section 1 1 SAFETY SECTION ...
Page 20: ...SAFETY PHDHF PHDHC 03 20 Safety Section 1 16 2020 Alamo Group Inc SAFETY Decal Description ...
Page 21: ...SAFETY PHDHF PHDHC 03 20 Safety Section 1 17 2020 Alamo Group Inc SAFETY ...
Page 23: ...Introduction Section 2 1 2020 Alamo Group Inc INTRODUCTION SECTION ...
Page 30: ......
Page 31: ...Assembly Section 3 1 ASSEMBLY SECTION ...
Page 35: ...Operation Section 4 1 OPERATION SECTION ...
Page 57: ...Maintenance Section 5 1 MAINTENANCE SECTION ...
Page 61: ...MAINTENANCE PHDHF PHDHC 03 20 Maintenance Section 5 5 2020 Alamo Group Inc MAINTENANCE ...
Page 62: ......