Howo Mining Truck Drive Shaft Abnormal Noise: Causes & Troubleshooting

Howo mining trucks operate under heavy-load, bumpy and dusty harsh working conditions, so the drive shaft is prone to wear, loosening, lubrication failure and other issues, resulting in frequent abnormal noise faults. Different sounds and working conditions correspond to different failure causes. Below are classified fault analysis, causes and inspection methods tailored to mining truck operating characteristics.

1. Metallic knocking noise (clunking sound) during start-up, gear shifting or on bumpy roads

This is the most common drive shaft abnormal noise on Howo mining trucks, which often occurs under heavy-load start-up, rapid acceleration and brake switching. It is mainly caused by excessive clearances of transmission parts and loose connections.

• Loose flange bolts / worn flanges of the drive shaft: Long-term heavy-load impact may loosen or strip the fixing bolts at the front and rear connecting flanges of the drive shaft. Excessive play from worn flange contact surfaces creates impact noise during power transmission. Continuing operation will aggravate drive shaft wobble and even risk shaft separation.

• Worn and loose universal joint cross shaft and needle roller bearings: Dust and mud easily invade cross shaft oil seals in open-pit operation. Inadequate maintenance or lack of grease causes wear, seizure and excessive play of needle roller bearings, producing clearance knocking noise when rotating, which worsens significantly on bumpy roads.

• Worn drive shaft spline assembly: The input and output splines bear heavy torque repeatedly. Tooth surface wear and excessive clearance after repeated telescoping and compression lead to misaligned spline meshing when starting or releasing throttle, generating metallic knocking noise.

2. Continuous humming noise at constant speed (louder with higher vehicle speed)

Low-frequency chassis roar when driving steadily; noise intensifies as speed rises. Usually caused by worn rotating components or failed dynamic balance.

• Damaged intermediate support bearing: Long-wheelbase drive shafts of Howo mining trucks are equipped with intermediate support bearings. Long-term heavy load and vibration wear bearing balls, damage retainers and crack aging rubber cushion sleeves, losing supporting and buffering functions. The drive shaft produces resonant humming noise during high-speed rotation.

• Failed dynamic balance of drive shaft: Mining trucks often scrape the chassis and drive shaft. Minor shaft deformation or fallen original balance weights cause unbalanced centrifugal force at high rotation speed, triggering vibration and continuous abnormal noise. Severe cases come with chassis shaking.

• Over-tight / seized universal joint after replacement: Improper assembly clearance after cross shaft replacement, overfilled grease or stuck impurities make the universal joint rotate unsmoothly and produce friction roar at high speed.

3. Fine squeaking / rustling friction noise at low speed when turning or on bumpy roads

Mostly caused by insufficient lubrication or component interference, a common fault from neglected maintenance.

• Severe lack of lubrication for universal joints and splines: Grease nipples on mining trucks are easily blocked by dust. Failure to replenish grease for a long time or leaking aged oil seals leads to grease loss. Dry friction of cross shafts and spline pairs creates fine friction noise during swinging while turning.

• Minor interference or scraping of the drive shaft: Deformed chassis guards, displaced suspensions or damaged and deformed drive shaft dust boots cause slight scraping between the drive shaft and surrounding parts on bumpy roads, creating continuous friction noise.

4. Targeted Quick Inspection & Solutions

1. Basic inspection (first priority): Shut down the engine and check all connecting bolts of the drive shaft. Tighten loose bolts and replace stripped or worn ones. Clean blocked grease nipples, fill high-temperature heavy-duty grease for cross shafts, splines and intermediate bearings, and replace aged leaking oil seals.

2. Clearance test: Manually rock the drive shaft. Obvious play at flanges, cross shafts or splines indicates excessive component wear. Replace universal joint assembly, spline sleeve or flange plate immediately. Do not continue operation with faults, as it will worsen damage.

3. Dynamic balance calibration: If high-speed noise is accompanied by chassis shaking, check whether the drive shaft is deformed or balance weights have fallen off. Slight deformation can be fixed by dynamic balance calibration; severely deformed shafts need direct replacement.

4. Intermediate support maintenance: Check whether the intermediate bearing rotates smoothly without seizure or abnormal noise. Replace the bearing and cushion support if the rubber support is cracked or aged to eliminate resonance noise.

5. Chassis interference check: Straighten deformed chassis guards and brackets, adjust drive shaft position to avoid scraping interference during driving.

5. Preventive Tips for Mining Trucks

Abnormal drive shaft noise on Howo mining trucks is mostly caused by harsh working conditions and poor maintenance. Shorten maintenance intervals:

• Check tightness of drive shaft bolts before daily operation;

• Refill grease for transmission system grease nipples every 3–5 days;

• Inspect cross shaft oil seals and intermediate bearing conditions monthly, and clean dust and impurities in time.These measures can greatly reduce the probability of abnormal noise faults.