Hydraulic dump trailers feature efficient loading and unloading, labor-saving operation and strong adaptability. They are widely used in engineering transportation, farm material transfer, sand and muck haulage and other scenarios, making them the mainstream models frequently purchased by overseas customers. Apart from superior manufacturing workmanship, the service life, operational stability and safety of trailers heavily rely on standardized daily maintenance. Proper maintenance habits can effectively reduce failure rates, cut maintenance costs and significantly extend the service life of the whole vehicle and hydraulic system. Below we share key daily maintenance points for hydraulic dump trailers.

1. Regular Inspection and Replacement of Hydraulic Oil

   As the core medium of the trailer’s hydraulic system, hydraulic oil directly determines the stability of lifting power. Check the oil level in the hydraulic fuel tank every month during routine use to ensure it stays within the standard scale range. Low oil level will cause air suction, overheating and abrasion of the oil pump. Meanwhile, inspect the condition of hydraulic oil. Replace it promptly if it turns turbid, black, contains impurities or appears emulsified and milky white.

   Under normal working conditions, replace hydraulic oil every 12 to 24 months or after around 2,000 working hours. Replace the hydraulic filter element and clean impurities inside the fuel tank during oil change to keep the oil circuit clean and unobstructed, thus preventing faults such as blocked oil lines, weak lifting and jerky lifting/lowering movements.

2. Cleaning and Maintenance of Oil Cylinders and Piston Rods

   Oil cylinders are critical components for the trailer’s lifting operations. Exposed piston rods easily accumulate sediment, dust and gravel, which will scratch sealing parts over time and lead to oil leakage and pressure loss. Wipe the surface of piston rods thoroughly after each operation to keep them free of contaminants.

   Regularly apply special grease to cylinder guide sleeves and pin joints to reduce mechanical friction and wear. When the trailer is left unused for a long time, fully retract the oil cylinder to prevent rust oxidation of the exposed piston rod and protect the integrity of sealing structures.

3. Inspection of Hydraulic Pipelines and Sealing Parts

   High-pressure hoses, sealing rings and joints are vulnerable wearing parts and common sources of oil leakage during malfunctions. Inspect all hydraulic pipelines regularly to check for aging, cracking, bulging or seepage on hoses, and ensure all joint screws are tightly fastened without looseness.

   Test lifting and lowering movements briefly before operation. Stop the machine immediately for troubleshooting if slow lifting/lowering, jerky motion, abnormal noise or load sinking due to pressure loss occurs. Never operate the trailer with faults to avoid safety hazards such as pipe bursting and accidental material spillage.

4. Maintenance of Vehicle Frame and Moving Components

   Hydraulic dump trailers operate under heavy loads for long periods, which may loosen or wear out the vehicle frame, cargo box hinges, support structures and fastening bolts. Regularly inspect all vehicle welds for cracks and deformation, and tighten all bolts and fittings. Pay special attention to moving parts including cargo box flip hinges and movable fulcrums, and apply grease regularly to guarantee smooth flipping and lifting.

   Also inspect the trailer’s braking system, tire pressure and tire wear to ensure safety during both driving and operation.

5. Standardized Operation and Long-term Storage Maintenance

   Comply strictly with rated load limits during daily operations and avoid overloading, which will cause irreversible damage to the hydraulic system under long-term overwork. Keep the vehicle level when lifting for unloading; do not operate on sloped or soft ground.

   If the trailer will be stored idle for a long time, fully lower and reset the cargo box to release pressure from the hydraulic system. Park it in a dry and well-ventilated area with full rust-proof and dust-proof treatment for the whole vehicle. Conduct simple trial runs periodically to ensure the equipment can be put into normal use at any time.