Cold Weather Operation; Operation - Stanley SK47 User Manual

6. The rotation control lever controls rotation speed from 0 to
approximately 300 rpm. Normal drilling is best accomplished
with the lever halfway between fully on and straight up off
position.
Note: Normal drill rotation is counterclockwise when viewed
from the top of the tool. The clockwise rotation position of the
motor control lever has been blocked with a roll pin stop to
avoid unscrewing a drill bit at the bottom of the drilled hole.
7. 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.
8. After the rock bit has carved out a depression in the mate-
rial 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.
9. Keep the drill steel centered in the hole.
10. Insuffi cient air fl ow can cause the drill steel to bind in the
hole.
11. Apply adequate feed pressure to the sinker drill to maintain
optimum drilling performance.
12. When drilling deep holes, it is advantageous to stop drilling
every 1 to 2 minutes. This allows the receiver and hoses to
charge and provide a short burst of air when the tool is again
turned on to clear excess cutting from the hole.
13. 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.
14. 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.

OPERATION

COLD WEATHER OPERATION

If the breaker is to be used during cold weather, preheat the
hydraulic fl uid at low engine speed. When using the normally
recommended fl uid, fl uid temperature should be at or above
50° F/10° C (400 ssu/82 centistokes) before use.
Damage to the hydraulic system or breaker can result from
use with fl uid that is too viscous or thick.
FLUSHING REQUIREMENTS
• The SK47 is designed for air fl ushing only.
• The minimum of CFM/7 liters per second at 75 psi/5 bar of
compressed air should be used for fl ushing the chips out of
the drilled hole.
• The minimum recommended hose size is 3/8-inch/10 mm
I.D. and must have a minimum working pressure rating of
150 psi/10 bar or 150 percent of the maximum pressure
produced by the system, whichever is higher.
• Air hoses must have an oil-resistant inner surface and an
abrasion-resistant exterior surface. When severe operating
conditions make the possibility of cutting or damaging the
hose likely, the hose shall be of extraply armored, or other
protective construction.
• Pressure regulators shall be used to limit maximum air
pressure at the tool to 100 psi/7 bar.
• An accessible means for shutting off the air supply to the
sinker drill should be provided.
• Automatic fi ltering systems are recommended.
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