. Characteristics of XYD-3 crawler hydraulic core drilling rig XYD-3 crawler hydraulic core drilling rig is mainly used for geological general investigation and exploration,road and tall building foundation exploration,kinds of hole in concrete structure,river levees,subgrade grouting hole drilling and direct grouting,civil wells and earth temperature central air-conditioner,ect.  ·The drilling rig is equipped with crawler chassis device, which is easy to move with fast speed. ·The crawler device is made of resistant steel mill. ·Hydraulic oil pressure feed device, which improves drilling efficiency. ·Pressure gauge displays the condition of the bottom of the drill hole. ·Drill mast controlled by hydraulic cyliner so it improves the efficiency. ·Diesel engine adopts the electric starter to reduce the labor usage. 2. Parameters of XYD-3 crawler hydraulic core drilling rig Drilling depth 600m Max. open hole caliber 300mm End hole caliber 75mm Drilling rod diameter 60mm Drilling angle 90°-75° Spindle  Spindle forward speed 30-1050r/min Spindle reverse speed 29-137r/min Spindle stroke 600mm Spindle inner diameter 96mm Main Winch Single line lifting speed 0.5/0.9/1.4/1.9m/s Diameter of wire rope 12.5mm Brake width 90mm Drum diameter 300mm The biggest single rope hoisting capacity 30kn Mud pump Type Horizontal triples BW-250 Mud Pump Displacement 250 l/min Water inlet diameter 75mm Water outlet diameter 50mm Power Diesel engine 38kw Electric motor Y180L??4 22KW Weight 6500kg Size 2500*900*1800mm