DIGGER DERRICK
1-44
463280 - 9/14 Terex South Dakota, Inc. Digger Derrick
OPERATION GUIDELINES
SETTING SCREW ANCHORS
Insert screw anchor into hollow shaft, and secure in position with retainers.
ILLUSTRATION OF SCREW ANCHOR
The digger has adequate torque and proper boom control for driving screw anchors at any angle under
almost all soil conditions. In stratified soils, the changes in penetration resistance from layer to layer cause
changes in torque and down pressure. The operator must compensate for these changes. Inadequate down
pressure may result in “churning” the soil, which destroys its holding strength. Careful coordination of digger
rotational speed and rate of advance of the boom must be obtained for a low and steady rate of penetration
for optimum installation.
Set the screw anchors as nearly in line with the Digger Derrick as possible. This permits controlling the
proper angle of screw anchor by using only the lift cylinder and the second section cylinder.
DIGGING IN LINE WITH DIGGER DERRICK
To release screw anchors from hollow auger shaft after it has been set, pull out on the retainer clips and,
using boom functions, raise the shaft from the screw anchor. Coordinate the boom movements to prevent
binding the auger shaft.
STORING DIGGER/AUGER
The auger can be stored using its own turning power in low speed if a two speed drive. It is wound up on a
cable or rope into the auger storage bracket along side the boom for transport and when not used for lifting
or using a platform. When stowing the auger the boom must be raised high enough to reduce the load on the
roll up cable and have auger above all personnel and equipment if roll up cable fails.
To properly store the digger, do the following steps to ensure a safe operation:
1. Fully retract the second section.
2. Inspect the rollup cable for damage, replace if required.
3. Rest the auger point on the ground and attach the roll-up cable to auger stem.
4. Raise boom to 45 degrees. Inform your ground personnel to stay clear, that you are about to store the
digger. Extend the intermediate section if required so roll-up cable does not wind over disc on auger
stem.
Remember, if the digger is a two-speed digger, you must store it in “LOW GEAR”.
5. Move digger control lever to “DIG” position until auger rolls up the side of the bracket if intermediate was
extended retract fully before auger and moves into the storage bracket.
1. Digger
2. Retainer Clip
3. Retainer
4. Hollow Auger Shaft
5. Screw Anchors
To Next Page
Loading...
Need help?
General
