TM 5-3805-280-10
Drilling
DRILLING
POSITION FOR DRILLING
Do not over reach.
Position base of mast over top of hole..
Place mast base on ground slowly.
Do not jack machine off ground.
Do not reposition boom or mast whilst
resting on ground.
START UP DRILLING
Check engine R.P.M mode setting.
Start compressor.
Close centralizer.
Dust hood up.
START DRILLING
Flush air to collar position and dust collector
on.
Rotation only feed bit to just above ground.
Move drill lever to "AUTO" position.
Depress button / Flick feed lever forward
and stop several times till bit travels without deflec-
tion.
If not straight start new hole
With bit straight hold lever forward and but-
ton depressed to complete collaring to required
depth.
Use water if required but dust collector must be off
(if machine is so equipped).
Move feed up and down the collar with air
off to solidify wall of hole.
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