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TM 5-2420-222-20-3
HYDRAULIC EARTH DRILL BORING HEAD - CONTINUED
ACTION
LOCATION
ITEM
REMARKS
CLEANING
NOTE
For more information on how to clean parts, go to General Maintenance Instructions (page 2-137).
WARNING
Drycleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use
only in a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors.
Do not use near open flame or excessive heat. The flashpoint is 100°F to 138°F (38° to 59°C). If
you become dizzy while using cleaning solvent, get fresh air immediately and get medical aid. If
contact with eyes is made, wash your eyes with water and get medical aid immediately.
13
Hydraulic earth
a. Using clean rags dampened in dry-
drill boring
cleaning solvent, wipe clean.
head (1)
b. Using clean, dry rags, wipe dry.
INSPECTION/REPLACEMENT
NOTE
For more information on how to inspect parts, go to General Maintenance Instructions (page 2-
137).
Replace defective parts as needed.
14
Hydraulic earth
Look for cracks, breaks, and abnormal
drill boring
bends.
head (1)
INSTALLATION
15
Hydraulic earth
Hydraulic earth
Install (page 2-1866).
auger attachment
drill auger
16
Hydraulic earth
Install (page 2-1862).
drill mounting
adapter
17
Hydraulic earth
Install (page 2-1855).
drill hoses and
fittings
2-1874
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