1. About the Manual: The Lake Drilling MOTOR is a powerful and reliable positive displacement motor. The motor generates an optimum balance of rotational speed and high torque to drive a variety of drill bits at speeds that maximize tool life and performance. LAKE MOTORS offers a choice of flow rates, speeds, and torques to match a wide range of operational parameters. LAKE MOTORS are used in applications such as straight hole drilling, directional (steerable) drilling, horizontal drilling, hole opening, and re-entry(work over). 2. CONSTITUTION: Downhole motors differ in size and performance characteristics, but they share the same basic components as follows (Fig.1) : Crossover Sub Safety Catch Sub Power Section Coupling Assembly Bearing Assembly 3. Usage: It is one kind of positive displacement downhole motor, with working principle is to convert the high pressure fluid power of mud into mechanical energy for bit rotation. It is widely used in oil field and mine directional well and horizontal well, cluster Wells and vertical Wells, drilling, deflecting, adjusting azimuth, coring, reaming, side tracking and workover treatment, and also applied in some special operations as compound drilling and traversing, etc. Specifications We can produce series of downhole motors in different sizes, as 57(21/4"),73(23/4"),89(31/2"),95(33/4"),120(43/4"),127(5"),165(61/2"),172(63/4"),178(7"),185(71/4"),197(73/4"),203(8"),216(81/2"),244(95/8"), etc.