What faults might you encounter after purchasing used construction machinery? How to solve and prevent them?

As a leading supplier of used construction machinery in Hunan, we have always been committed to providing our customers with higher quality machines and more attentive service. In 2026, our 'Service Miles Tour' plan was officially launched. This time, we went to Ethiopia — let's take a look at what problems we encountered and how to solve and prevent them.

I. Rotary Drilling Rig

1. GPS lock alarm.

Cause: GPS signal loss.

Precautions: Request permanent unlocking from the manufacturer before shipment.

2. The lithium grease pump of the XR200E rotary drilling rig does not work automatically – teach the customer to operate it manually.

Recommendation: Advise using high-quality lithium grease.

3. Engine maintenance precautions:

1) If the fuel contains many impurities, an additional filter element can be installed between the fuel tank and the water separator.

2) Replace the air filter regularly to extend the service life of the cylinder kit and the turbocharger.

3) Let the engine idle for 3 minutes after starting and before shutting down to protect engine mechanical components.

II. Concrete Pump Truck

1. Crankshaft bearing failure on the Benz chassis OM470 engine.

Cause: Lubrication system failure.

Precautions:

1) Check the engine oil level regularly.

2) Recommend using 0Benz specified engine oil that provides good low-temperature starting performance and high-temperature viscosity protection.

3) Change the engine oil every 500 hours.

2. Insufficient engine power and frequent fault warnings.

Suspected issues:

1) Incomplete removal of the Adblue system.

2) High engine coolant temperature (108°C).

Root cause after inspection: Electronic fan clutch failure.

Precautions:

1) Use Mercedes-Benz original coolant (freezing point –37°C, maximum boiling point 130°C). Do not add water.

2) Confirm that the Adblue system has been completely removed before shipment.

Ⅲ. Truck-mounted concrete pump

1. Main cylinder seal leaks oil into the washing chamber.

Precautions:

1) Keep the water in the washing chamber clean to promptly detect slurry leakage from the concrete piston. This extends the service life of the delivery cylinder and piston rod seal.

2) In summer, add water to the washing chamber; in winter, when the temperature is below 0°C, add hydraulic oil. Do not add waste engine oil.

Ⅵ. Trailer pump

1. Speed drop during high-displacement pumping.

Cause: Constant power valve of the main hydraulic pump is stuck.

Precautions:

1) Material buildup inside the S-pipe increases pumping pressure.

2) Replace the diesel filter in a timely manner.More cases will be continuously updated. Please follow Drillmaster.