50-26 Operation D7x11 Series II Navigator Directional Drill
IMPORTANT: Use communication procedures as explained in this section. Refer to the Preparation section,
“Warning Safety Signs and Operating Instructions,” page 40-2.
Step 1: Install backreamer. Refer to “Hex Coupler Connection - Assembly,” page 30-19.
Step 2: Attach swivel to reamer as shown, by inserting bolt (1) through clevis end of
swivel. Secure with nut and pin (2). Swivel must be aligned with the reamer
before rotating the reamer.
NOTE: Vermeer double eye swivels are designed for use with Vermeer reamers to limit
the angle between the reamer and swivel. Vermeer swivels and reamers aligned within
this limited angle will reduce the possibility of whipping and rotation of the trailed
product. The use of other swivels and reamers may not provide this inherent benefit.
Resuming Operation
Step 1: Verify drill string and cutting tools are ready for operation.
Step 2: Confirm everyone is away from exit pit, drill string, and cutting tools, and that
no wrenches or tongs are attached to the drill string or cutting tools.
Step 3: Warn everyone who may be exposed to the drill string or cutting tools that operation will resume.
WARNING: Death or serious injury could occur if you are struck by
whipping pipe or product. Never use a shackle when attaching swivel to
backreamer. Shackle will not keep the swivel aligned with the reamer and
may result in whip and rotation of trailing drill string or product.
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