Identify and deal with those "abnormal noises" on agricultural machinery

1. Abnormal noises occurring at the transmission

When the gear meshing clearance is too large, a "clanging clanging" sound can be heard when the vehicle starts or the accelerator is changed while driving. When driving at a constant speed on a flat road, the noise weakens or disappears, but when the temperature of the transmission rises and the lubricating oil thins, the noise increases. The reason is that the side clearance of the teeth is too large, and the tooth surfaces collide with each other during transmission. If this abnormal noise occurs at a certain gear, the fault lies in the gears meshing with each other at that gear. If this sound occurs in all gears, it indicates that the normally meshing gears are worn out. This noise is mostly benign. If it is not serious, it can continue to be used. When the noise is severe, the meshing gears can be replaced in pairs.

2. The noise caused by too small gear meshing clearance: If a vehicle has difficulty shifting gears and makes continuous "uh-ok" sounds during driving, with the higher the speed, the louder the sound, it is due to too small gear meshing clearance. The fault lies in the meshing gear of the gear where the noise occurs. This sound is mostly benign. As the mating parts wear out, the sound will weaken or disappear.

3. The sound of uneven gear meshing: When the engine is idling, it makes a rhythmic "clack clack" sound. When the accelerator is pressed, it turns into a "clack - clack" sound. In severe cases, vibration of the transmission can be felt. This is caused by the protrusion or loss of gear teeth, the bending of the second shaft or intermediate shaft, and the offset of the gear center. The drive wheel can be suspended and the gear shifted to repeatedly change the speed. If the sound is relatively clear, it indicates that the teeth have been damaged or fallen out, and the gear should be replaced. If the sound is dull and chaotic, it is mostly due to the shift of the gear center or the bending of the second shaft and the intermediate shaft. The gear shaft should be corrected.

4. Loose noise from transmission bearings: During vehicle operation, if there is a rather chaotic "clattering" sound of the bearings breaking, this phenomenon is mostly caused by excessive bearing clearance, looseness, damage to the bearing cage, or the bearing moving out of the outer circle. When a bearing is partially damaged but the balls can still rotate, the sound is not easily audible. The bearing should be replaced.

Ii. Abnormal noise occurring at the drive shaft

When the universal joint cross shaft and needle roller bearing are worn and loose, and the spline teeth and spline sleeves of the transmission shaft are loose, a "click-click-click" sound will be emitted, sometimes a "clang clang clang" impact sound, and the vehicle will shake. When a vehicle starts, it often begins only after hearing a "click". When the intermediate bearing of the transmission is skewed, a "whoosh" sound will be emitted. When the drive shaft is unbalanced, it will make a "gurgling gurgling" sound. Worn parts should be replaced and the balance shaft corrected.

Iii. Abnormal noises occurring in the rear axle area

When the vehicle speed suddenly changes during driving, a "clanging clanging" sound can be heard at the rear axle due to excessive gear meshing clearance. When the vehicle is lightly loaded, it makes a "clattering" sound. This phenomenon is caused by excessive gear meshing clearance. If a rather chaotic crashing sound is heard, it indicates that the total clearance of each gear is too large. In severe cases, a "clicking" sound will be heard when the vehicle starts. The meshing clearance should be adjusted.

2. When the gear meshing clearance is too small, a "ow" sound occurs during vehicle operation, similar to the siren of a fire engine. The higher the vehicle speed, the louder the noise. The noise remains unchanged when the accelerator is increased or decreased. Sometimes, if the rear axle gets hot, it is caused by the gear meshing clearance being too small. In addition, when the rear axle is short of oil, a similar sound will be produced, sometimes accompanied by a "hissing" sound. Lubricating oil should be added and the meshing clearance adjusted.

3. Uneven tooth gap noise: A "gurgling" sound occurs when the vehicle is in motion. The noise increases as the vehicle speed rises. There is noise when the accelerator is increased or decreased. In severe cases, the rear axle may swing. This phenomenon is an abnormal noise caused by uneven gear meshing clearance. If the vehicle makes noise when going uphill, it indicates that the meshing position of the driving bevel gear and the driven bevel gear of the main reducer is close to the tooth root. The driving bevel gear should be adjusted outward. If there is a noise when going downhill, it indicates that the meshing position of the above-mentioned gears is close to the tooth top. The driving bevel gear should be adjusted inward.

4. When the tooth surface is damaged, a "whooshing" sound will occur as the vehicle speed increases, similar to a strong wind. When the accelerator is withdrawn, the noise increases. When turning, it turned into a "mm-hmm" sound again. If there is a metallic knocking sound, it may be that the gear is broken. You should stop the machine immediately for inspection and replace the gear.

5. Poor meshing of planetary gears can cause a "mm-hmm" sound when the vehicle is traveling straight at low speed. The faster the vehicle speed, the louder the noise. When turning, there was a "clump clump" sound, and at the same time, the rear axle felt a bit shaky. It should be inspected. When the fault is serious, it should be replaced.

6. The sound of planetary gears seizing the cross shaft is a "click-click-click" sound when the vehicle is turning, but it disappears when driving at high speed. Planetary gears should be repaired or replaced, and lubricating grease should be added in a timely manner.

7. The loosening sound of the fixing bolts of the conical driven gear: When the vehicle speed suddenly changes during driving, a "clump clump clump" sound will be produced. The sound is weaker under light load and louder under heavy load. Stop the vehicle immediately for inspection, tighten the fixing bolts and replace the parts if necessary.