An underground mining dump truck may experience common faults during daily operation, and cargo box lifting difficulty is one of the most frequent issues users should understand and address in time.
Common Causes of Cargo Box Lifting Difficulty
In most cases, lifting difficulty happens because the hydraulic system cannot build enough pressure. The most common reasons include:
1. Insufficient hydraulic oil in the tank, which directly reduces lifting force.
2. Blocked oil tank filter or hydraulic pipelines, preventing normal oil flow.
3. Hydraulic pump failure, where the pump cannot supply oil properly.
4. Stuck lifting switch or control valve, causing oil to return to the tank instead of entering the lifting cylinder.
5. Stuck lifting cylinder or limit valve, keeping the main control valve in a continuous return-oil state.
6. Contaminated hydraulic oil, where impurities block the distribution valve.
7. Severely worn relief valve or internal leakage of the high-pressure pump, reducing system pressure.
8. Damage to the power take-off or pump gears, resulting in insufficient hydraulic output.
Wear-Related Internal Leakage
Another common cause is severe wear of the distribution valve spool. Excessive clearance between the spool and the valve cargo box allows high-pressure oil from the gear pump to leak back into the oil tank. This leakage prevents the hydraulic system from reaching the required pressure for lifting.
Practical Troubleshooting Advice
When an underground mining dump truck shows lifting difficulty, operators should:
1. Identify the exact fault source step by step.
2. Check oil level and oil cleanliness first.
3. Inspect filters, valves, and hydraulic components for blockage or wear.
4. Repair or replace damaged parts based on inspection results.
Understanding these causes helps users solve lifting problems quickly and safely. Regular inspection and maintenance of the underground mining dump truck hydraulic system can reduce downtime, extend equipment life, and ensure stable and efficient underground transportation operations.
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