I. Basic Case Information (Model, Working Hours)

Product: Rotary Drilling RigModel: XR360Working Hours: 3300

II. Fault Symptom

Slow rotation speed of the power head.

III. Fault Analysis

The circuits of the three coils of the power head motor are normal.
The measurements of the three coils of the power head motor show no damage.

IV. Troubleshooting Process

The voltage and ground wire of the three coils are measured to be normal.
The resistance of the three power head coils is normal, but the coils have no magnetism after being energized, so the coils are judged to be faulty.
Replace the three power head coils, and the fault is resolved.

V. Fault Cause (Conclusion)

Internal damage to the coils results in the failure of motor displacement.

More information

Rotary Drilling Rig Engine Failure to Start

Slow Rotary Drilling Rig Power Head Speed (Coil Failure)

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