Hydraulic excavator lower walking body maintenance

Hydraulic excavators are mainly used for digging operations and rarely travel long distances. Therefore, it is easy to ignore the maintenance of the lower walking body. However, once the lower walking body failure will cost a considerable amount of downtime and repair costs. In order to reduce the operation loss and repair cost caused by shutdown, attention should be paid to the maintenance and inspection of the lower walking body.

When cleaning the machine, the sludge on the lower walking body should be cleaned at the same time
After the operation, does the operator clean the sludge on the lower walking body while cleaning the cab? If there is sludge attached to the lower walking body. The inspection of its related parts cannot be carried out. Therefore, be sure to remove this sludge and inspect and maintain the lower walking body.
◆ Is the bolt loose?
◆ Whether the sprocket and the heavy support wheel can not be rotated?
◆ Whether the sprocket, the support wheel and the driving wheel leak oil?
If the above abnormal state is ignored, serious accidents will eventually occur. If the bolt is broken and the related parts are damaged and the supporting sprocket or the supporting wheel is worn off, the maintenance cost will be greatly increased.

Track tension should be adjusted appropriately according to the soil quality
The soil quality varies from construction site to construction site. In order to prolong the service life of the machine, the track tension should be adjusted according to the soil quality.
◆ When the soil is soft Track and rail link is easy to adhere to the soil, so the track should be slightly loose, to prevent soil attachment caused by the abnormal stress on the rail link.
◆ In the construction site with pebbles
The track should also be slightly loose, so that when walking on the pebble, you can avoid the bending of the track plate.
◆ Solid and flat ground It's better to make the tracks a little tighter

Track tension adjustment
If the track is stretched too tight, the walking speed and walking power will decrease. This not only results in reduced efficiency, but also causes abnormal wear due to excessive friction applied to the pins and bushings.
On the contrary, if the track is adjusted too loosely, the track loosely on the driving wheel and sprocket, causing more wear or damage. Moreover, when the loose track droops too much, it may contact with the frame and damage the frame. In this way, even the strengthened lower walking body, if not properly adjusted, will lead to the occurrence of unexpected failure.
For details on the track tension adjustment method and the standard amount of adjustment, see the Operator's Manual that comes with the track.

Maintenance methods to reduce wear
Support sprocket, heavy wheel, driving wheel and rail chain, etc., in the long running process, there will be a certain degree of wear. However, there is a large difference depending on whether routine inspections are carried out or not. Therefore, as long as a little time is spent on proper maintenance, you can well control its wear.
◆ If part of the sprocket and support wheel can not run under the state of continued use, it may lead to roller wear, but also may cause the wear of rail link. If a roller that does not work is found, it must be repaired immediately! In this way, other faults can be avoided.
◆ If you repeatedly walk on the inclined ground for a long time and turn suddenly, it will make the side of the rail link contact with the side of the driving wheel and the guide wheel, thus increasing the degree of wear. Therefore, as far as possible, avoid walking on inclined areas and sudden turning. Straight line and large turn, can effectively prevent wear.

Bolts and nuts should be carefully checked
When the machine works for a long time, the bolts and nuts will become 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 operate when the track plate bolt is loose, there will be a gap between the bolt and the track plate, which will lead to cracks in the track plate. Moreover, the gap may also increase the bolt hole between the track and the rail chain node, resulting in the failure to tighten and must replace the track and rail chain node serious consequences.
Therefore, bolts and nuts should be inspected and tightened regularly to reduce unnecessary costs.
The following parts shall be inspected and fastened:
◆ track plate bolt;
◆ Mounting bolts for supporting heavy wheel and sprocket;
◆ driving wheel mounting bolt;
◆ Walking pipe bolt, etc.

Also should not need to maintain the part of the inspection
In order to facilitate the maintenance of the machine, various necessary technologies have been adopted. For example, floating oil seal is used on the support wheel, sprocket and driving wheel to meet the working requirements of these parts. Usually, such parts do not need to be oiled, but because they are only injected with a small amount of oil when they leave the factory, so in case these oil leaks, there will be wear and tear of the shaft and bearing parts, and in serious cases, there may be shaft fracture. Therefore, it is necessary to check whether there is oil leakage in these areas during routine inspection.
Regular cleaning of the lower walking body is very important.
Attention should be paid to the inspection of the lower walking body which supports the weight of the whole excavator and plays a huge role!