(1) determine the solenoid valve solenoid valve is closed to determine whether tight: Remove the motor at the two pipes leading to the solenoid valve, and with two plugs were blocked both ends of the motor oil port, and then operate the main hoist mechanism, if its work normal, indicating a fault by two solenoid valves closed lax; if still not normal, the need to check its components. (2) determine the hydraulic lock hydraulic lock determine whether there is a problem: first adjust its two cylinders, if does not work, then remove the lock to be carefully checked, because if not, the available ready-made lock installed for testing in order identify the cause of the failure. Because hydraulic lock and auxiliary winch main winch the same, so you can borrow auxiliary winch locks, individually replaceable using a method of identifying the main winch lock is good or bad. If two locks are not the problem, then the next inspection. (3) Check the brake oil brake signal to determine the signal to oil, breaking the speed: The current rig, its signal flow of oil can be adjusted, that is the main winch brake release time can be adjusted. Thus, for both types of drilling rigs, oil flow signal can be adjusted by its valve, if the operation of the machine is still not normal, the tubing shall check whether the braking oil clogging signal. If these checks are normal parts, can only continue under investigation. (4) determine the brakes overhauled brakes: Look brake piston is moving in a smooth line of work for the cause for repair or replacement. German deep drilling Xinghua Machinery Co., Ltd. is specialized in the production of rotary drilling drill, auger drill, mention lead the enterprise, honesty is the company's purpose endless pursuit of excellence is the goal. Wholeheartedly customer service is the company's consistent policy. Only by creating value for customers. in order to create value for themselves.