d. Before changing attachments, turn off the air pressure at the air compressor.
e. Always detach the air hose from the air connection when stopping operations for any length of time.
f. Never operate tool unless attachment is in contact with work.
139. Operation
a. Insert the attachment to be used (clay spade, flat pick, or moil point) into the chuck of the clay digger.
b. Fill the clay digger oil reservoir with oil (par. 140a).
c. Blow out the air hose and connect it to the air connection of the clay digger.
d. Operate the clay digger at slow speed for a few moments to permit even distribution of oil to all working parts.
140. Servicing
a. Lubrication. It is vitally important that the clay digger be well lubricated at all times. Always remove the oil fill plug
and fill the oil reservoir before starting operations. Clean the surface around the filler hole before removing the plug, and
wipe the plug before it is reinstalled. Check the oil supply frequently, refilling whenever necessary. Below 32 F., use OE
10, engine oil; above 32 F., use OE 30, engine oil.
b. Preparing for Storage. To prevent internal parts of the digger from rusting while in storage, follow the procedure
outlined below:
(1) Flush the clay digger thoroughly with cleaning solvent.
(2) Flush the tool with light machine oil to lubricate all parts.
(3) Wedge a cloth plug into the air inlet and exhaust openings to prevent dust from entering while the tool is in
storage.
(4) Store the clay digger in its appropriate place in the engine Side tool box.
Section III. WOOD DRILL
141. Description
The pneumatic reversible wood drill (fig. 65) is powered by a blade-type, rotary pneumatic motor. This drill has a
wood bore capacity of two inches and is equipped with a griphandle, a dead handle, and a roll type throttle handle. The
following ship auger bits are supplied in a canvas bag: three 7/16 x 12, three , 3/4 x 12, one 1 x 12, one 2 x 12,
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