30-34 Overview D7x11 Series II Navigator Directional Drill
Drilling Fluid
Drilling fluid increases drilling efficiency in several ways. Refer to Fundamentals of HDD
manual for drilling fluid and drilling fluid system information.
An external water system is normally used to mix drilling fluids for use with this drill. The
on-board water tank is normally used for cleaning the machine and drill rods.
Adding Antifreeze to Drilling Fluid System
Store RV-type antifreeze in tank (1). It can be reused as necessary. Replace antifreeze when it
is too diluted to protect system.
Step 1: Drain and flush drilling fluid tank and pump (refer to the Transporting the Machine
section, “Flushing Bentonite/Polymers from Drilling Fluid System,” page 50-36).
Step 2: Fill tank (1) with 6 gal (23 L) of RV-type antifreeze. Use at full strength; it will become diluted as it is used.
Step 3: Install cap on coupler (2), open valve, and operate mixing system until antifreeze comes out of drive chuck.
Step 4: Connect wash wand to quick coupler (3).
Step 5: Spray fluid into tank until antifreeze is visible in the spray from wand.
Step 6: Close valve and follow “Shutdown Procedure,” page 50-3.
Step 7: Point wash wand away from people and squeeze handle to release pressure remaining in wand.
Step 8: Remove wash wand from drilling fluid pump quick coupler and store wash wand.
WARNING: High pressure water can penetrate skin. Serious injury possible
Keep nozzles away from body.
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