How to change the small excavator slewing ring?

How to change the small excavator slewing ring?

The slewing bearing of the small excavator basically needs to be replaced every two to three years. Most of the reasons are tooth ring gear collapse. Large radius of gyration, long-term high load, and overload work, causing tooth ring gear collapse. The slewing ring quality problems occupying a small part.

How to change the small excavator slewing ring ? You can follow the below steps:

1.Choose a gentle zone for the site, where the forklift can enter to facilitate lifting. The self-weight of a small excavator is generally 3-4 tons. Except the chassis, the forklift can complete the operation. Off course,If you can find a crane will be much better. But please do not use jacks for loading and unloading, the risk factor is relatively large.

2.Pull the small excavator back to the site. For easy disassembly, you can use a small air gun tool. Before disassembling, you need lift the boom, tie it with rope and upper lifting hole to the back weight, to prevent the boom from falling down, because the disassembly needs to turn the excavator, the lower fixing screw needs to be turned to two positions to remove two, if the boom fall down,it will be troublesome.

3.Disassemble the seat and operating chassis of the cab, and then you can see the middle rotary joint, record each of the above oil pipes separately:one is for return oil, four is for walk left and right, two is for speed button, two is for bulldozers, another one is the slewing bearing grease pipe,it can be arranged in series with the steel wire. The big excavator lacked two oil pipes of the bulldozer. Then loosen the swing motor and lift it up, so that the whole excavator can be pushed back! Remove the lower circle of screws first, then you can disassemble the upper part and move it to another place.

4.Then replace with a new slewing bearing, first install the slewing bearing tightening screws. The screws must be completely replaced to prevent any injuries or damage. Bolt size according to the provisions of GB/T5782-2000 and GB/T5783-2000, the strength is not less than the 8.8 grade specified in GB/T3098.1-2000, our company recommends the use of 10.9 high-strength bolts, select 8.8 grade, 12.9 grade for special purposes high-strength bolts. Each bolt must be tightened with a kilogram wrench to achieve even pressure.

5. Tighten the inner ring screws on the slewing ring, apply new butter, and spread each tooth evenly. After wiping, align the upper half of the excavator as it is, and align it with the platform positioning pins and the slewing bearing, and then install it in turn.

Xuzhou wanda slewing bearing co.,ltd  is professional in produce varies slewing ring bearing for small excavators. The material for slewing bearing is quenched, and the tooth is hardened. If you have any demand, please contact us  to get more details.