Manual of XZ320 Horizontal Directional Drill
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stem.
8.4.2 Rotate the main axle and move the power head forward. Connect
main axle pin to the box of auger stem then screw down the connector.
8.4.3 Open the front jaw vice to loosen the auger stem.
8.4.4 Open the mud pump for continued re-expanding or back towing.
8.5 Shutdown
8.5.1 Low-speed no-load operation for 5 minutes is required for engine
before shutdown for cooling.
8.5.2 Toggle key switch to shutdown position or pressure the button then
remove the startup switch key.
8.5.3 Power off the main switch then remove the power switch key.
9 Technical difficulties during construction
9.1 Jamming of a drilling tool
Jamming of a drilling tool is a common technical difficulty during
re-expanding and reasons shall be defined for troubleshooting.
9.1.1 Retract the drill bit, auger stem and move drill to drill the guide hole
again if there is jamming with underground pipelines.
9.1.2 Jamming of bricks or stones in the soil: Loosen the torque and rotate
the drill bit for slow expanding. Jamming of large stone or concrete in the
soil: Strive to retract the drill bit and move drill for re-drilling or excavate
stones for continued expanding. Do not operate forcefully or auger stem
may be broken and drill is lost in the hole.
9.1.3 Slow down expanding speed and increase mud consumption if there
is frequent jamming for large-diameter expanding in hard clay layers.
Sometimes 40 minutes shall be required for back towing of an auger stem.
9.1.4 Loosen the torque and re-expand slowly if jamming is caused by
collision of drill bit and root. Root shall be crushed to avoid obstacles if
re-expanding is required.
9.2 Hole shrinkage
Hole shrinkage may be caused in the hole during re-expanding in soft soil
layer. Water in the hole will flow out of the auger stem inversely after
disassembling the auger stem to indicate severe hole shrinkage. Pipes
may be protruded with deformation even jamming under severe hole
shrinkage.
Solid mud protective wall shall be selected for severe hole shrinkage to
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Содержание XZ320
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