Slewing ring forges of truck crane is an important "joint" of crane, so its maintenance is very important. When carrying out maintenance work, pay attention to the danger of being pulled into the rotary pinion, squeezing and shearing. When carrying out maintenance work, it must be ensured that when starting the engine for necessary steering and luffing actions, there are no maintenance personnel in the dangerous area between the main boom, the upper vehicle and the rolling plate, or between the lower vehicle and the rolling plate, except the crane operator. The slewing bearing shall be maintained in the following aspects:
Check the bolts of the slewing ring: 1. Visually check the bolts on the slewing ring before each operation of the crane; 2. Check whether the bolts are loose after the first operation of the slewing ring for 100 hours; Then check again at the 300th working hour and every 500 working hours thereafter; The inspection interval shall be shortened if it is under severe working conditions. If the bolts are found to be loose during the inspection, please stop the construction operation and immediately contact the local after-sales service department. The factory or professional technicians will check and decide whether to disassemble and inspect immediately; 3. Fill the slewing bearing with lithium grease before installation; 4. Wipe the bolt clean. When replacing the bolt, apply thread fastening glue and tighten it; Check the fastening bolts regularly according to the requirements, and use the crane according to the requirements of the operation manual and lifting performance table to avoid the risk of bolt fatigue damage.
Routine inspection of rotation: 1. Regularly check the flexibility of rotation; In case of noise and impact, stop the machine immediately to check and eliminate the fault, and remove it if necessary; 2. Regularly check the meshing tooth surface for bite, gnawing and peeling, and check the rotating gear ring for crack or damage; 3. Regularly check the integrity of the seal. If the sealing belt is damaged, it shall be replaced in time. If it falls, it should be reset in time.
Lubricate the slewing ring gear surface: the slewing ring gear has been coated with antirust oil before delivery, and the validity period of this antirust oil is generally 3 ~ 6 months. After the expiration date, anti rust oil shall be applied in time. In addition, during use, the slewing ring shall not be directly exposed to the sun. It is forbidden to directly flush the slewing ring with water to prevent water from entering the raceway and hard foreign matters from approaching or entering the tooth meshing area.
Lubricate the slewing ring raceway: the raceway must be filled with grease regularly according to the working environment. After working for 50 hours, the raceway shall be filled with grease, and then injected every 300 working hours. The slewing ring shall be filled with grease before and after long-term placement. If the crane is cleaned with a steam jet cleaner or a fixed sprinkler, care must be taken to ensure that water does not penetrate the slewing ring connection, and then lubricate the slewing ring connection. In special working environment, such as tropical, high humidity, dusty, large temperature change and continuous operation, the lubrication cycle shall be shortened.
