What should I do if the connection between the output shaft and the load coupling of the BWY18-11-3KW cycloidal reducer with pin-type output structure is loose?

When the output shaft of the BWY18-11-3kW cycloidal reducer with pin-type output structure is loosely connected to the load coupling, it must be stopped immediately for inspection and re-tightened according to specifications to avoid vibration, eccentricity or damage to the shaft system.

If this type of loose connection is not dealt with in time, it may cause serious failures such as output shaft beating, bearing overload, or even shaft breakage. The following are systematic processing steps:

1. ‌Stop immediately and cut off power‌

To prevent further damage, the equipment should be stopped immediately and the power supply should be cut off to ensure safe operation.

2. ‌Disassemble and check the status of connecting parts‌

Remove the coupling and check the following items one by one:

‌Whether the pin shaft and pin hole are worn and deformed‌: Observe whether there are scratches, bends or diameter reduction on the surface of the pin shaft (the normal gap should not exceed 0.05mm);

‌Whether the coupling taper sleeve or clamping ring has failed‌: Pin-type structures often use taper sleeve locking methods, check whether the cone surface is rusted, indented or plastically deformed;

‌Coordination of keyway and key pin‌: If it is a key connection, check whether the key is loose, shear deformed or the gap on both sides is too large;

‌Whether the thread at the end of the output shaft is damaged‌: If the thread used to tighten the nut slips, it will not be able to provide sufficient locking force.

3. ‌Reinstall and tighten (key steps)‌

Clean all mating surfaces to remove oil and rust;

Correctly insert the coupling into the output shaft to ensure accurate positioning;

Use a torque wrench to tighten the compression nut or locking bolt evenly and step by step according to the manufacturer's recommended value (generally 45~60N·m, please refer to the BWY18 manual for details);

After tightening, turn the car by hand to confirm that the rotation is smooth and there is no jamming.

4. ‌Calibration and monitoring before operation‌

Use a dial indicator to detect the end face and radial runout of the coupling. The runout should be ≤0.05mm, otherwise it will easily cause jitter;

Conduct a no-load test run for 5 to 10 minutes, monitor for any abnormal noise, and touch the shaft end to determine whether the temperature rise is abnormal;

Strengthen inspections within 2 hours after running with load to confirm that there is no sign of loosening again.

5. ‌Preventive Maintenance Recommendations‌

Check the connection tightening status every ‌500 hours or 3 months‌;

Under conditions of high vibration and frequent starts and stops, it is recommended to install anti-loosening washers or thread glue;

Optional ‌torque monitoring device or vibration sensor‌ can achieve early warning.