Common faults and precautions of excavators

[BONOVO]

1. Reasons for "jumping gear":

1. The performance of the self-locking mechanism is reduced. To prevent the transmission from "jumping gear", this type of excavator is equipped with self-locking steel balls and springs in the cover holes above the gear shift fork shafts of the gears II, III and IV, V, and in the gear shift forks I and reverse. When the elasticity of the spring for positioning and self-locking is weakened or broken, the self-locking performance of the self-locking mechanism will decrease until it disappears, causing the transmission to "jump gear". At the same time, if the grooves on the positioning steel balls or the fork shaft are worn, it can also cause the transmission to "jump gear".

2. Sudden changes in external loads Due to the working nature of the excavator and the design of the machine itself, sudden changes in external loads can also cause its transmission to "jump gear". When the road surface is uneven, the machine is driving downhill or the driving route is improper, causing the external load to change suddenly, this sudden change in load will act on the gear meshing gear of the transmission through the wheels and the transmission shaft, causing the gear meshing gear to disengage due to the axial thrust, causing the transmission to "jump gear".

3. Improper adjustment of the shifting device. The transmission of this type of excavator adopts a mechanical manual shifting method. If the shift lever, longitudinal axis, transverse axis and vertical fixing screws are loose, the transmission may also "jump gear".

2. Emergency treatment method: During the driving process of the excavator, if the transmission "jumps gear", the machine should be stopped in time (or continue to drive), and then the cause should be found and the fault should be eliminated.

The specific method is:

1. If "jump gear" occurs when driving on a flat road, the machine can be stopped according to the normal shutdown method, and the cause should be carefully found and the fault should be eliminated.

2. If the gear jump occurs when driving on a downhill slope, the gear should be placed in a high-speed position according to the gear-up action principle or the gear grabbing measure (emergency downshift) should be adopted. After the machine reaches the bottom of the slope, the machine should be stopped for inspection and troubleshooting. If the gear-up or gear grabbing is unsuccessful or the gear jump occurs again (at this time, it is neutral), the driver can control the engine speed at a medium speed (to prevent the engine from stalling), use the "brake" method to slide the machine to the bottom of the slope, and then troubleshoot. If the gear-up or gear grabbing is unsuccessful or the gear jump occurs again (at this time, it is neutral), and the machine is on a steep downhill slope (at this time, the machine will "dive" to the bottom of the slope at a very fast speed), it should be stopped quickly according to the downhill stopping action principle and requirements, and then the fault should be eliminated.

3. If "gear jump" occurs when driving uphill, the gear position can be placed in the low-speed position or the I gear position, and the machine can be stopped when it reaches the top of the slope to eliminate the fault; if the gear reduction fails or "gear jump" occurs again, the machine should be stopped according to the action essentials and requirements of the slope stop, and then the fault should be eliminated.

III. Preventive measures for excavators:

1. Operate strictly in accordance with the operating procedures and driving essentials, and try to avoid "tooth knocking" when shifting gears to reduce the wear of the gear pair.

2. When assembling the transmission, the operation should be strictly followed by the operating procedures, and the various parts of the transmission should be adjusted correctly and tightened appropriately. When driving on a large downhill road, the driver should strictly follow the downhill action essentials and must not violate the rules.

3. Pay attention to the repair and maintenance of the self-locking mechanism. The positioning steel balls, springs and fork shafts that have reduced or lost their positioning efficiency should be repaired or replaced in time to keep the self-locking performance of the self-locking mechanism in good condition.

4. Strictly implement the maintenance system and strengthen the maintenance of the shifting device. When the gear shifting device rod system is improperly connected, it should be adjusted in time to ensure the gear shifting device has good performance.

Mini crawler excavator，Mini crawler excavator attachments，Excavator attachments，Crawler excavator，Mini excavator purchase

Choose BONOVO for high-quality, customizable brush cutters for skid steers with fast delivery. Contact us today to discover how our superior products can enhance your land management tasks!

for more info just visit our website at www.bonovogroup.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com