Characteristics of XYD-44A crawler hydraulic core drilling rig XYD-44A crawler hydraulic core drilling rig is a multi-purpose spindle well drilling rig suitable for high-speed medium and deep borehole drilling in complex rock formation. HuaxiaMaster well drilling rigs covers all the main foundation and drilling technologies with a range of models whose characteristics, capability and performance find application in every operating condition. 2. Applications of XYD-44A crawler hydraulic core drilling rig ·Hydraulic core drilling rig , ·engineering well drilling , ·hydrology and water well drilling ·large diameter foundation piles construction 3. Parameters of XYD-44A crawler hydraulic core drilling rig XYD-44A crawler hydraulic core drilling rig Drilling depth 600-1400m Max open hole caliber 300mm End hole caliber 75mm Drilling rod diameter 60mm Drilling angle 90-65 Drill rig moving stroke 450mm Spindle  Spindle speed ( Diesel Engine) Forward 60 97 169 187 276 301 284 487 521 847 1180 1490r/min Reverse 65 201r/min Spindle speed ( Electric Motor) Forward 50 81 141 155 230 251 320 406 434 706 984 1247r/min Reverse 54 167r/min Spindle stroke 600mm Spindle max. pressure force 90kn Spindle inner diameter 96mm Lifting capacity 120kn Main hoist  Max.single line lifting capacity 45kn Max.single line lifting speed 0-45m/s  Wire rope caliber 17.5-18.5mm Hoist capacity of wire line 90-110m Roller diameter 140mm Wirerope diameter 6mm Wire rope length 450m Mud pump Type BW-250 Displacement 250 l/min Work pressure 80kg/cm² Water inlet pipe diameter 75 mm Water outlet pipe diameter 50 mm Power Diesel engine YC4E135-1 81KW Electric motor Y225S-4   37KW