How to replace the slewing bearing of a crane?

Crane bearings are often in working environments with high load, much dust and large vibration, so they are prone to failures such as wear, overheating and abnormal noise, and need to be replaced in time to avoid more serious equipment problems.

Preparation Before Replacement

• Prepare new bearings that are consistent with the model and specification of the original bearings, and ensure their quality meets relevant standards.

• Prepare necessary tools such as wrenches, pullers, heating equipment, etc., and clean the work site to ensure the operation space is safe and tidy.

• Inspect the relevant parts of the crane to determine the specific location and cause of the bearing failure, so as to avoid similar problems after replacement.

Replacement Steps

• Disassemble related parts: According to the structure of the crane, gradually disassemble the parts that hinder the bearing replacement, such as protective covers, couplings, gears, etc. During the process, pay attention to making marks to avoid mistakes during installation.

• Take out the old bearing: Use appropriate tools to remove the old bearing from the shaft. If the bearing is tightly fitted with the shaft, the inner ring of the bearing can be expanded by heating to facilitate removal, and avoid damaging the shaft or other parts by forced disassembly.

• Install the new bearing: Before installation, clean the shaft neck and bearing seat hole, and apply an appropriate amount of grease. If the bearing is an interference fit, the bearing can be heated before installation to ensure that the bearing is installed in place, avoiding inclination or excessive clearance.

• Reset parts: Reset and install the disassembled parts in sequence according to the marks, ensuring that all parts are firmly connected and run flexibly.

Inspection After Replacement

• After installation, manually rotate the relevant parts to check for jamming, abnormal noise, etc., to ensure that the bearing runs smoothly.

• Test run the crane, observe whether parameters such as bearing temperature and vibration are normal. If there is any abnormality, stop the machine in time for inspection and adjustment.

Regular maintenance and timely replacement of faulty bearings for crane bearings are important links to ensure the safe and efficient operation of cranes, which can effectively extend the service life of the equipment and reduce the incidence of failures.