There should be no visible _______ in a hoist motor shaft of a geared machine during acceleration and deceleration.

There should be no visible _______ in a hoist motor shaft of a geared machine during acceleration and deceleration.

• A. backlash
• B. end play
• C. runout
• D. misalignment

Answer: (B)

End play is the axial clearance or movement of the shaft along its axis. In a geared hoist setup, the shaft should stay firmly in place during acceleration and deceleration, so you shouldn’t see any noticeable end play. If there is end play, the shaft can move in and out because of bearing clearance and thrust from the gears and drum during speed changes. That unwanted axial movement indicates excessive bearing wear or improper fit and can lead to gear and rope handling issues. Backlash refers to the clearance between mating gear teeth, which is a different kind of play tied to gear mesh, not the shaft’s axial movement. Runout is the wobble or deviation of the shaft as it rotates, a radial issue, not axial. Misalignment is about the shaft axes not being properly aligned, which causes side loading but isn’t the axial clearance described by end play.

End play is the axial clearance or movement of the shaft along its axis. In a geared hoist setup, the shaft should stay firmly in place during acceleration and deceleration, so you shouldn’t see any noticeable end play. If there is end play, the shaft can move in and out because of bearing clearance and thrust from the gears and drum during speed changes. That unwanted axial movement indicates excessive bearing wear or improper fit and can lead to gear and rope handling issues.

Backlash refers to the clearance between mating gear teeth, which is a different kind of play tied to gear mesh, not the shaft’s axial movement. Runout is the wobble or deviation of the shaft as it rotates, a radial issue, not axial. Misalignment is about the shaft axes not being properly aligned, which causes side loading but isn’t the axial clearance described by end play.