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How to maintain the slewing bearing of the truck-mounted crane?

09-06, 2022 / in Bearing Knowledge / by LDB

The truck-mounted crane is a carrier vehicle with both hoisting and cargo-carrying functions. The slewing bearing plays a very critical role in the middle as an accessory of the truck-mounted crane. The accessory of slewing bearing is not only used on truck-mounted cranes, but also used on construction machinery models such as flatbed trucks. Next, the following detailed introduction is given to the maintenance methods of truck-mounted slewing bearings and the precautions for use. Let's understand together. Just a moment.

Maintenance method of slewing bearing of truck mounted crane

slewing bearing of the truck-mounted crane

1. Regularly add grease

When the product is put into use, it should be filled with new grease according to different working conditions. The slewing bearing should be filled with grease regularly. According to different types of slewing bearings, the specific filling time of grease is as follows:

(1) Ball type: add grease every 100 hours of operation;

(2) Roller type: add grease every 50 hours of operation;

If it is in a special working environment, such as: tropical, high temperature, dusty, high temperature, and continuous work, the grease filling cycle should be shortened, and it should be ensured that it should be filled every 50 hours; Apply detergent once every 150 hours. When working vigorously, apply detergent every 75 hours. Note that the teeth must be wiped clean before applying detergent.

The machine must be filled with new grease before and after the machine has been stagnant for a long time. Each time the grease is added, the raceway must be filled until it overflows from the sealing device. When adding grease, the slewing bearing should be slowly transferred. Fill the raceway with grease evenly.

Because there are many comprehensive factors in the use process, the user can choose the appropriate grease according to the specific situation. For example, the raceway can use: No. 3, No. 4 graphite grease, industrial grease, No. 203 grease, No. 7002 High and low temperature bearing grease and No. 2 aluminum-based grease, etc.

2. Clean the surface

During use, the sundries on the surface of the slewing bearing should be removed frequently, and the sealing strip of the slewing bearing should be checked for aging, cracking, damage or detachment. If one of these conditions occurs, the sealing strip should be replaced in time to prevent sundries and grease from entering the raceway. Corresponding grease should be smeared after replacement to avoid rolling elements and raceways getting stuck or corroded.

3. Regularly check the bolts

Since the installation of the slewing bearing, after 100 hours of operation, the pre-tightening force of the bolts should be checked, and after every 500 hours of operation, sufficient pre-tightening force must be maintained.

After the equipment has been working for 2000 hours, if a bolt is found to be loose to less than 80% of the specified torque, the bolt and two adjacent bolts should be replaced with new ones; if 20% of the bolts are found to be loose to less than 80% of the specified torque, Replace all bolts with new ones. After the cumulative operation of the equipment reaches 14,000 hours, all bolts are replaced with new ones.

4. Pay more attention

In use, pay close attention to the operation of the slewing bearing. If noise, impact, or sudden increase in power is found, it should be stopped immediately for inspection until all faults are eliminated. If necessary, it needs to be disassembled and inspected.

5. Water flushing is prohibited

When the slewing bearing is in use, it is forbidden to directly wash the slewing bearing with water, to prevent steam or other liquids from entering the slideway to cause rust; strictly prevent hard foreign objects from approaching or entering the meshing area, so as to avoid injury to the teeth or unnecessary trouble.

Precautions for the use of the slewing bearing of the truck-mounted crane

slewing bearing of the truck-mounted crane

1. Pay attention to the external pollution and cleaning of the slewing bearing

The slewing bearing of the truck-mounted crane is generally a large-diameter slewing bearing, and the working environment during use is mostly outdoors, and the slewing bearing is easily polluted by the external environment and has accidents. Because the large slewing bearing is not only expensive, but also has a long production cycle and relatively high replacement costs, so it requires our skilled workers to pay extra attention to maintenance. According to statistics, more than 95% of slewing bearing failure problems are caused by surface pollution and lubrication problems. Therefore, attention should be paid to cleaning the bearing surface contamination in time during use.

2. Timely maintenance of minor faults

The failure of the bearing during the use of the machine causes the machine to stop working or the accident is mostly because the small problems in the early stage are not discovered and dealt with in time. Vibration and other abnormal conditions should be dealt with in a timely manner, do not ignore it because it does not affect the normal operation of the machine, and cause irreversible damage in the later stage.

3. Do not overload or overload hoisting

During use, the slewing bearing of the truck-mounted crane must be used according to the instructions and specifications of the crane. Do not overload or hoist heavy objects, which may cause damage or failure of the slewing bearing.

The above is the entire content of the maintenance method and precautions for the slewing bearing of the truck-mounted crane. Regular maintenance of the slewing bearing during use can prolong the service life of the truck-mounted crane.

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