The core of a used construction machinery inspection report focuses on three areas: whether structural components have cracks or welds, hydraulic system pressure and flow data, and engine cylinder pressure and exhaust smoke condition. A qualified report must include a cold start video, hydraulic gauge readings, and actual measured undercarriage wear values. If any one of these is missing, the report should be discounted. For used machines under 200,000 yuan, the report can be trusted about 70%; for equipment over 400,000 yuan, it is advisable to bring your own technician for a re-inspection.
What Exactly Is Written in an Inspection Report
Inspection reports issued by legitimate third-party organizations or large dealers are generally divided into five to seven modules by system. The structural section records weld repair traces and crack locations on the boom, arm, bucket, and swing platform, noting whether they are original factory welds or later repair welds. The hydraulic section provides main pump pressure, pilot pressure, and swing motor leakage—these data best reflect the machine's true working condition. The engine module looks at cylinder pressure, oil pressure, and exhaust smoke color, with cold start time being a hard indicator. The undercarriage and travel section records track link pitch, roller wear, and travel motor speed difference.
There is another area that is easily overlooked—electronic controls and instrumentation. If the computer board, display, or throttle motor of an imported excavator has been replaced with aftermarket parts, the report will usually state "non-original." Such machines have a significantly higher subsequent failure rate. Sanqi Machinery has encountered many machines returned from the Middle East and Southeast Asia in its export business, and the proportion of equipment with modified electronic controls is not low. When purchasing, be sure to have the seller list this item separately in the report.
How to Read Report Data Without Being Fooled
- Hydraulic main pump pressure: For a 20-ton excavator, normal is 32-35 MPa. Below 30 MPa indicates wear in the pump or relief valve, with repair costs starting at 15,000 yuan.
- Engine cylinder pressure: Taking the Cummins QSB6.7 as an example, the standard value is 28-32 bar. Below 24 bar basically requires removing the cylinder head.
- Track link pitch: The standard track pitch for a Caterpillar 320 is about 190 mm. Wear exceeding 3 mm means considering track replacement, costing 20,000-40,000 yuan for a set.
- Swing clearance: Measured with a dial indicator. Exceeding 1.5 mm indicates swing bearing wear, with overhaul costs above 30,000 yuan.
- Hour meter: Near-new machines with under 2,000 hours have the most inflated readings. The hours in the report must match maintenance records and GPS tracking.
There is a rough reference for pricing: For a 20-ton used excavator, 2018-2020 models in average condition, the domestic market price is 280,000-450,000 yuan; the same model exported to Africa or Southeast Asia, plus logistics and customs clearance, typically sees a landed price increase of 15%-25%. If the report shows both hydraulic and engine work have been done, and the asking price is more than 100,000 yuan below market, it can basically be judged to have hidden problems.
On-Site Inspection Cannot Rely Only on the Report
The report is paperwork; on-site inspection is where the truth is revealed. Bring a tape measure, an infrared thermometer, and a sheet of white paper. After cold start, listen to the sound at idle. Place the white paper at the exhaust outlet for half a minute; obvious black spots indicate incomplete combustion. Perform combined operations—raise the boom while swinging—and see if the engine drops more than 200 rpm. A large drop indicates a mismatch between hydraulics and engine. For the travel test, drive straight for 20 meters. If it deviates more than half a meter, the travel motor or center joint may have internal leakage.
For the undercarriage, get down and look for oil leaks from rollers and track tension. A large difference in the extension of the tension cylinders on both sides is also a signal. In the cab, check the instrument panel for fault codes. Small things like air conditioning, lights, and horn can actually reflect the previous owner's maintenance habits. Export equipment also requires additional checks on emission standards. Machines below Euro III cannot enter the EU, and some Middle Eastern countries are also tightening restrictions.
Common Questions FAQ
How much does a used excavator inspection report generally cost?
Domestic third-party inspection agencies charge by tonnage: about 800-1,500 yuan for a 20-ton machine, and 2,000-3,500 yuan for over 30 tons. For export equipment inspected by SGS or BV, the cost is 3,000-6,000 yuan, with a turnaround time of 3-5 working days.
The inspection report shows the hydraulic system is normal. Why does it still have problems after I receive it?
The report only reflects static data at the time of inspection. If the oil temperature had not reached operating temperature during inspection, or only a single pump was tested without combined operations, the data will be overly optimistic. It is advisable to request the seller to provide a video of combined operations under warm conditions.
Which items in the report should I focus on when buying a used bulldozer?
For bulldozers, the core focus is the transmission and final drive. The three most critical items in the report are transmission oil pressure, torque converter temperature, and metal content in the final drive gear oil. If any one is missing, a supplementary test should be requested.
What special requirements do export used loaders have for inspection reports?
Customs clearance in the destination country usually requires emission certification and age certification. Some countries also require radiation testing. The report should preferably include an English version and state that the equipment is asbestos-free and free of ozone-depleting substances; otherwise, it may be returned.
The report states "structural components have repair welds." Can I still buy it?
It depends on the weld location. Repair welds on the bucket or cutting edge have little impact; repair welds on the boom root, swing platform, or frame require caution. Fatigue strength of such load-bearing parts decreases after repair welding, and they are prone to re-cracking under heavy load. The price should be at least 15% lower than a normal machine.
How can I tell if hydraulic parts and engine parts of used construction machinery are original?
Check the part number stamp and packaging anti-counterfeiting features. Kawasaki, Rexroth, and Cummins all have official inquiry channels. Aftermarket parts typically cost 40%-60% of original parts. If the report marks "replacement parts," the overall machine value should be recalculated based on aftermarket prices when purchasing.
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