When it comes to purchasing a used digger, a comprehensive inspection is crucial to ensure you're making a sound investment. As a used digger supplier, I've witnessed firsthand the importance of a thorough pre - purchase inspection. In this blog, I'll share some professional insights on how to inspect a used digger before buying.
External Visual Inspection
The first step in inspecting a used digger is a detailed external visual examination. Start by checking the overall condition of the machine's body. Look for signs of dents, scratches, and rust. Dents could indicate previous collisions or rough handling, which might have caused internal damage. Rust is a clear sign of corrosion, and severe rust can weaken the structural integrity of the digger.
Inspect the tracks or wheels, depending on the type of digger. For tracked diggers, check the track tension. Loose tracks can cause uneven wear and affect the machine's stability. Examine the track pads for excessive wear, cracks, or missing parts. In the case of wheeled diggers, inspect the tires for tread depth and any signs of damage such as cuts or bulges.
Check the boom, arm, and bucket. These are the working components of the digger, and any damage to them can significantly impact its performance. Look for cracks, bent sections, or signs of welding. Welding on these components might indicate previous repairs due to damage, and it's essential to ensure that the welding was done properly.
Engine Inspection
The engine is the heart of the digger, so a thorough engine inspection is a must. Start by checking the engine oil level and its condition. The oil should be clean and at the appropriate level. If the oil is dirty or has a milky appearance, it could indicate internal engine problems such as a blown head gasket.
Inspect the coolant level and the radiator. The coolant should be at the correct level, and the radiator should be free from blockages. A blocked radiator can cause the engine to overheat, leading to serious damage.
Listen to the engine while it's running. A healthy engine should run smoothly without any unusual noises such as knocking, rattling, or hissing. Knocking noises could indicate problems with the engine's pistons or bearings, while hissing noises might suggest a leak in the intake or exhaust system.
Check the air filter. A dirty or clogged air filter can restrict the airflow to the engine, reducing its performance and fuel efficiency. Replace a dirty air filter if necessary.
Hydraulic System Inspection
The hydraulic system is responsible for powering the digger's working components, such as the boom, arm, and bucket. Start by checking the hydraulic fluid level. The fluid should be clean and at the appropriate level. If the fluid is dirty or has a burnt smell, it could indicate problems with the hydraulic system, such as worn - out seals or a failing hydraulic pump.
Inspect the hydraulic hoses for any signs of leaks, cracks, or bulges. Leaking hydraulic hoses can cause a loss of hydraulic pressure, reducing the digger's performance. Bulges or cracks in the hoses are also a sign of weakening, and they should be replaced immediately.
Operate the digger's working components and observe the hydraulic system's performance. The boom, arm, and bucket should move smoothly and respond quickly to the controls. Any delay or jerky movements could indicate problems with the hydraulic system.
Electrical System Inspection
The electrical system of the digger controls various functions, including the lights, gauges, and engine start - up. Start by checking the battery. The battery terminals should be clean and free from corrosion. A corroded battery terminal can cause poor electrical connections, leading to starting problems.
Inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Damaged wiring can cause electrical malfunctions, which can be difficult to diagnose and repair.
Test all the electrical components, including the lights, gauges, and controls. All the lights should work properly, and the gauges should display accurate readings. If any of the electrical components are not working, it's important to determine the cause before making a purchase.
Undercarriage Inspection
For tracked diggers, the undercarriage is an important part to inspect. Check the track rollers, idlers, and sprockets. These components should rotate freely without any excessive play or noise. Excessive play in the track rollers or idlers can cause the tracks to wear unevenly and reduce the digger's stability.
Inspect the track links and the pins. The track links should be in good condition, and the pins should be properly secured. Loose pins can cause the track to come off, which can be dangerous and costly to repair.
Documentation and History Check
In addition to the physical inspection, it's also important to check the digger's documentation and history. Ask for the maintenance records of the digger. A well - maintained digger is more likely to be in good condition. The maintenance records can also provide information about any previous repairs or problems.
Check if the digger has a clear title. This ensures that there are no outstanding liens or legal issues associated with the machine. You can also do a background check on the digger to see if it has been involved in any accidents or has a history of major repairs.
Why Choose Our Used Diggers
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If you're in the market for a used digger, we encourage you to get in touch with us. Our team of experts is ready to assist you in finding the right digger for your needs. We can provide you with more information about the inspection process, the available models, and the pricing. Contact us to start the purchasing process and get a digger that will serve you well for years to come.
References
- Construction Equipment Maintenance Handbook.
- Hydraulic System Troubleshooting Guide.
- Engine Diagnostic Manuals.
