The maintenance of the slewing bearing of a truck-mounted crane is very important!

Check the bolts of the slewing bearing

Before each operation of the crane or at least once a week, visually inspect the bolts on the slewing bearing.

2. After the slewing bearing has been in operation for 100 working hours for the first time, check if the bolts are loose. Check again at the 300th working hour. Check it every 500 working hours thereafter. The inspection intervals should be shortened under harsh working conditions. If loose bolts are found during the inspection, please stop the construction work immediately and contact the local after-sales service department. The factory or professional technicians will conduct an inspection to decide whether to disassemble and inspect immediately.

3. Before installation, the slewing bearing should be filled with lithium-based grease first.

4. When replacing bolts, wipe them clean, apply thread fastening glue and then tighten them. If the crane is used in accordance with the requirements of the operation manual and the lifting performance table, or the fastening bolts are inspected regularly as required, the risk of bolt fatigue damage can be avoided.

Routine inspection of slewing bearings

1. Regularly check the flexibility of rotation; If noise or impact is detected, the machine should be stopped immediately for inspection and troubleshooting. If necessary, disassembly and inspection should be carried out.

2. Regularly inspect the rotary gear ring for any cracks or damages, and check if there are any phenomena such as meshing, biting, or tooth surface peeling on the meshing tooth surfaces.

3. Regularly check the integrity of the seal. If the sealing tape is found to be damaged, it should be replaced in time. If it falls off, it should be reset promptly.

Lubricate the tooth surfaces of the slewing bearing

The gear ring of the slewing bearing has been coated with anti-rust oil before leaving the factory. The anti-rust validity period is generally 3 to 6 months. After the validity period expires, anti-rust oil should be applied in time.

In addition, during use, prevent the slewing bearing from being directly exposed to sunlight. It is strictly prohibited to directly rinse the slewing bearing with water to prevent water from entering the raceway. Be sure to prevent hard foreign objects from approaching or entering the meshing area of the teeth.

Lubricate the raceways of the slewing bearing

The raceways must be regularly lubricated with grease according to the working environment. After the first 50 working hours of operation, the raceway should be filled with lubricating grease. Thereafter, it should be refilled every 300 working hours. The slewing bearing must be filled with grease both before and after long-term storage. If a steam jet cleaner or a fixed water sprayer is used to clean the crane, care must be taken to ensure that water does not seep into the slewing bearing connection. Subsequently, the slewing bearing connection must be lubricated. In special working environments, such as tropical regions, high humidity, much dust, large temperature fluctuations, and continuous operation, the lubrication cycle should be shortened.

Grease injection should be carried out when the slewing bearing rotates slowly. When the lubricating grease overflows from the seal, it indicates that the injection is complete. The spilled grease will form a thin film, which serves as a seal.

Trinity Palfinger

Sany Palfinger is a joint venture established by Sany Heavy Industry, the top brand in China's construction machinery industry, and Palfinger Group, the top brand in the global truck-mounted crane industry, with a joint investment of 300 million yuan