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2. Start the hydraulic supply and turn the circuit
control valve to the "ON" position.
3. Open the air valve on the tool just enough to permit
a small amount of air to flow from the rock bit.
Air flow must be continuous during drill-
ing to avoid clogging of air passages and/
or backflushing of waste products into the
drill.
4. Place the rock bit firmly on the surface to be drilled.
5. Grip the handles on the tool firmly and open the
hydraulic valve lever slightly to start the tool at a
slow speed. Adequate down pressure is very
important.
6. Ensure the rock bit is rotating at a moderate speed
(not too fast, not too slow). When starting the hole,
it is best to start at a slow impact and rotation speed
until the rock bit has carved out a depression in the
material being drilled. If the rock bit is not rotating
open the hydraulic valve lever further. If the rock bit
still does not rotate adjust the motor control knob
until rotation is achieved.
7. After the rock bit has carved out a depression in the
material being drilled, open the hydraulic valve
lever fully. Readjust the motor control knob to
obtain a good drilling speed. Adjust the air valve to
ensure the cuttings are being extracted from the drill
hole.
8. When the bottom of the tool comes within 6 inches
of the drill hole, it is time to either add another
section of drill steel or replace the existing drill steel
with a longer section. Close the hydraulic valve
lever but leave the air valve "ON" and then lift the
tool with drill steel and rock bit out of the hole.
Leaving the air valve "ON" helps prevent cuttings
from falling around the bit while the bit is lifted
from the hole.
9. When the tool, drill steel and bit have been removed
from the drill hole, turn the valve lever "OFF" and
turn the hydraulic supply circuit control valve
"OFF" before changing the drill steel or rock bit.
COLD WEATHER OPERATION
If the tool is to be used during cold weather, preheat the
hydraulic fluid at low engine speed. When using the
normally recommended fluids, fluid temperature should
be at or above 50° F/10° C (400 ssu/82 centistokes)
before use.
ROUTINE MAINTENANCE
A very important maintenance practice is to keep the
hydraulic fluid clean at all times. Contaminated hydrau-
lic fluid causes rapid wear and/or failure of internal
parts.
Periodically apply a light coat of WD40™ between the
throttle lever and throttle valve and the motor control
knob and motor control valve.
Check the nitrogen charge in the accumulator. If low,
recharge the accumulator. See the section titled "ACCU-
MULATOR CHARGING" found later in this manual.
STORAGE
Disconnect all hoses and wipe the tool clean. Spray the
interior of the drive hex and motor plate with WD40™.
Also apply a light coat of WD40™ between the throttle
lever and throttle valve and the motor control knob and
motor control valve.
Store in a clean, dry place.
8
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