OPERATION
The recommended hose size is .500 inch/12 mm I.D. up to 50 ft/15 m long and .625 inch/16 mm I.D. minimum up to 100 ft/30 m.
PRE-OPERATION PROCEDURES
CHECK POWER SOURCE
1.Using a calibrated flowmeter and pressure gauge, check that the hydraulic power source develops a flow of
140 bar.
2.Make certain the hydraulic power source is equipped with a relief valve set to open at
INSTALL DRILL STEEL & ROCK BIT
Use standard
Drill steels are available in a variety of lengths. Start with a short length so that the tool may be operated at a normal standing position. The tool handles should never exceed chest height during operation.
1.Thread a rock bit onto the drill steel.
2.Rotate the latch (61) out and up.
3.Slide the drill steel into the tool.
4.Rotate the latch down being careful not to pinch your fingers. When correctly installed, the collar on the drill steel should be above the bottom of the latch.
CONNECT HOSES
1.Wipe all hose couplers with a clean,
2.Connect the hoses from the hydraulic power source to the tool fittings or quick disconnects. It is a good practice to connect return hoses first and discon- nect them last to minimize or avoid trapped pressure within the tool.
3.Observe flow indicators stamped on hose couplers to ensure that fluid flow is in the proper direction.
The female coupler on the tool hose is the inlet cou- pler.
4.Move the hydraulic circuit control valve to the ON position to operate the tool.
NOTE:
If uncoupled hoses are left in the sun, pressure in- crease within the hoses may make them difficult to connect. When possible, connect the free ends of the hoses together.
5.Connect the hose from the air supply to the hose on the tool.
NOTICE
The air supply must be minimum 30 cfm at 120 psi. Supplying less than these specifications may result in inadequate extraction of rock cuttings; cause cuttings to migrate up the drill steel and into the tool and result in tool damage; diminish drilling time; and cause premature wear of the drill bit.
OPERATION PROCEDURES
1.Observe all safety precautions.
2.Install the appropriate tool bit for the job.
3.Start the hydraulic supply and turn the circuit control valve to the ON position.
4.Open the air valve on the tool just enough to permit a small amount of air flow from the tool bit.
NOTE:
Air flow must be continuous during drilling to avoid clogging of the air passages and/or
5.Place the bit firmly on the surface to be drilled.
6.Open the hydraulic valve lever slightly to start the tool at a slow speed. Adequate down pressure is very important.
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.
10 ► SK58 User Manual