We build the JK930 for water well work that happens away from paved roads. Compressor, mud pump, mast and rod rack all ride on one 6X4 truck. The crew drives to site, drops the outriggers, raises the mast and starts drilling, with no lowboy, no crane and no second truck for the compressor.
The top section is usually soil, clay, sand or gravel. For that part the JK930 runs mud rotary: the onboard pump circulates through a tricone bit, the wall holds on a mud cake and surface casing goes in as you go. When the bit reaches granite or basalt, you change over to the DTH hammer and the high pressure screw compressor takes over. Same mast, same rig, about half a day to swap head, hoses and bit.
| Drilling depth | 300m with 3m rods |
| Hole diameter | 105-350mm |
| Engine | 290-340HP diesel |
| Air package | 17-35 m3/min at 1.05-2.5 MPa |
| Rotary head | 0-80 rpm, 8,000-10,000 N.m |
| Feed stroke | 3.5m |
| Pullback | 25t |
| Rod handling | Hydraulic rack, 3m rods |
| Chassis | 6X4, left or right hand drive |
| Outriggers | 4 hydraulic with mechanical locks |
Two practical notes. At 300 m with 3 m rods you are making a hundred joints, so the hydraulic rack and the 25 t pullback are what keep the day moving; a rig with a weaker head loses hours right there. And if your sites are more than 60 km apart, stay with the truck version, because a crawler needs a lowboy every time it moves.
Tell us the target depth, hole size and the formation you expect, and we quote the hammer and bit package with the rig.