I. Immediate Shutdown and Natural Cooling (Prerequisite for Inspection)
1. Do not shut down the engine directly after overload. Let it idle for 5-10 minutes before stopping to avoid thermal shock damage to the turbine and oil circuit.
2. Allow the engine to cool naturally for at least 30 minutes, ensuring the water temperature is <85°C and the hydraulic oil temperature is <60°C, before proceeding with contact inspection.
II. Quick Inspection Methods for Critical Components
1. Vibration Bearing (Most Prone to Early Failure)
Use a stethoscope or electronic stethoscope close to the bearing housing to check for any unusual "humming" or "clicking" noises.
Feel the temperature; if it is hot to the touch (>70°C), it indicates lubrication failure or fatigue damage.
2. Steel Wheel Welds (Core of Structural Safety)
Focus on inspecting the hub connection and reinforcing rib area. Visually inspect or use a flashlight for cracks, paint peeling, or deformation.
If possible, use an ultrasonic flaw detector to check for micro-cracks.
3. Hydraulic System (Power Supply)
Observe whether the hydraulic oil has darkened in color, has a burnt smell, or contains suspended metal particles.
Check for oil leaks or drips at pipe joints, valve blocks, and cylinder seals.
Confirm that the system pressure is stable and that there are no sluggish or weak movements.
4. Engine and Fluid Condition
Pull out the oil dipstick and check if the engine oil is black, emulsified, or contains metal particles.
Check if the coolant level is sufficient, if the radiator is clogged, and if the fan belt is loose.
5. Shock Absorber and Cushioning Device
Check if the rubber shock absorbers are cracked or if they lack compression and rebound strength.
Observe whether the hydraulic damper cylinder leaks oil and whether its function is normal.
