In response to the longitudinal displacement and stuck problem of the sliding seat of the EBZ260M4anchor drilling system, a mechanical analysis method was used to derive the calculation formula for the drivingtorque of the sliding seat gear and rack under the condition of pitch angle. Through checking the original designparameters, the insufficient longitudinal displacement torque of the original sliding seat was the main cause of thelongitudinal displacement and stuck problem. Considering the severe lubrication pollution on the digging machineface site, a larger friction coefficient and a smaller gear and rack transmission efficiency were selected. Therequired driving torque for its longterm stable operation was calculated to be 1 898 N·m, and a driving torque of2 000 N·m was selected as the improvement plan. The onsite use results showed that there was no further stuckphenomenon and the hidden trouble was eliminated.
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