Maintenance of hydraulic excavator final drive parts

Hydraulic excavators are mainly used for excavation work and rarely travel motor long distances. Therefore, it is easy to ignore the maintenance of the lower walking body. However, in the event of a failure of the lower traveling body, considerable downtime and no minor repair costs are incurred. In order to reduce the loss of operation and repair costs caused by the shutdown, attention should be paid to the maintenance and inspection of the lower traveling body.

When cleaning the machine, the sludge on the lower traveling body should be cleaned at the same time.

After the work is completed, does the operator clean the sludge on the lower traveling body while cleaning the cab? If sludge is attached to the lower traveling body. It is not possible to check the relevant parts. Therefore, be sure to remove these sludges and inspect and maintain the lower traveling body.

◆ Is the bolt loose?

◆ Can the carrier roller and the roller cannot rotate?

◆ Is the carrier roller, the roller and the drive wheel leaking oil?

If you ignore the above abnormal state, it will eventually lead to serious accidents. If the bolt is damaged and the related final drive motors parts are damaged and the carrier roller or the roller is worn away, the maintenance cost will be greatly increased.

Appropriate adjustment of track tension should be based on soil quality

The soil quality of different construction sites will vary. The track tension should be adjusted in conjunction with the soil to extend the life of the machine.

◆ When the soil is soft

The track and the rail link are easy to adhere to the soil, so the track should be slightly loose to prevent the abnormal stress applied to the rail link due to the adhesion of the soil.

◆ When working on a construction site full of pebbles

The track should also be slightly looser so that the bending of the track shoe can be avoided when walking on the pebbles.

◆ Solid and flat ground

It’s best to adjust the track slightly tighter.

Track tension adjustment

If the track is too tight, there will be a phenomenon that the walking speed and the running power are degraded. This not only causes a drop in work efficiency, but also causes abnormal wear due to excessive friction applied to the pin and bushing.

Conversely, if the track is too loose, the track rests loosely on the drive and carrier wheels, causing more wear or damage. Moreover, when the loose track sag is too large, contact with the frame may occur and the frame may be damaged. Thus, even if the reinforced lower traveling body is not properly adjusted, an unexpected failure may occur.

See the random Operator's Manual for details on track tension adjustment methods and standard adjustments.

Maintenance method to reduce wear

The carrier roller, the roller, the drive wheel and the rail link will have a certain degree of wear during long-term operation. However, depending on whether the daily inspection is carried out or not, there will be a large difference. Therefore, as long as it takes a little time to perform proper maintenance, the degree of wear can be well controlled.

◆ If some of the carrier rollers and the roller are not working, the roller may be worn and the rail links may be worn. If you find a roller that cannot be operated, you must repair it immediately! In this way, other failures can be avoided.

◆ If you repeatedly walk on the inclined ground for a long time and suddenly turn, the side of the rail link will be in contact with the side of the drive wheel and the guide wheel, thereby increasing the degree of wear. Therefore, walking and sudden steering in inclined areas should be avoided as much as possible. Straight line travel and large turns can effectively prevent wear.

Care should be taken to check bolts and nuts

When the machine is working for a long time, the bolts and nuts will loose due to the vibration of the machine. In particular, the bolts and nuts on the lower walking body are easily affected. If the machine continues to run with the track shoe bolts loose, a gap will be created between the bolts and the track shoes, which will cause cracks in the track shoes. Moreover, the generation of clearances may also increase the bolt holes between the track and the rail links, resulting in inability to tighten and the serious consequences of having to change the track and rail links.

Therefore, bolts and nuts should be inspected regularly and tightened to reduce unnecessary costs.

The following parts should be inspected and tightened:

◆ track shoe bolts;

◆ Supporting bolts and support roller mounting bolts;

◆ drive wheel mounting bolts;

◆ Walking piping bolts, etc.

Also check for areas that are not to be maintained

In order to facilitate the maintenance of the machine, various necessary techniques are employed. For example, a floating oil seal is used on the roller, carrier roller and final drives wheel to meet the working requirements of these components. Usually, such parts do not need to be refueled, but since they are only injected with a small amount of oil at the factory, in the event of leakage of these oils, wear of the shaft and the bearing parts may occur, and in the case of severe shaft breakage may occur. Therefore, in daily inspections, these parts should also be inspected to confirm the presence of oil leakage.

Regular cleaning of the lower walking body is critical.

Attention should be paid to the inspection of the lower walking body that supports the weight of the entire excavator and plays a huge role!

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