Al comprar un excellent performance second-hand excavator, it is necessary to assess its performance from multiple dimensions.
Appearance Check
- Rust and Paint: Inspect the main structural components (such as the boom, arm, platform, and chassis) for serious rust, repairs, or large areas of repainted surfaces. Severe rust can affect the structural strength, while large areas of repainted surfaces may conceal signs of accidents or major repairs. For second-hand excavators, normal wear and tear causing paint loss is common.
- Covering Parts: Check whether the cabin, engine cover, side doors, etc., have serious deformation, damage, or are missing.
- Cleanliness: Check the engine compartment, hydraulic oil tank, and valve blocks for excessive oil stains. Excessive oil stains may indicate long-term leakage or improper maintenance.
Structural Component Check
- Boom, Arm, Bucket: Carefully inspect the welds for cracks. Bending, deformation, or repair marks on structural components may indicate overuse. Tap the structural components to listen to the sound; a dull sound may indicate internal cracks.
- Pins and Bushings: Check the wear of bushings at the pin connections. Excessive wear can cause shaking and abnormal noises during operation.
- Chassis: The chassis bears significant stress, so check for deformation, cracks, or severe rust. Any damage may affect the safety of the excavator.
Travel Mechanism Check
- Tracks: Check the wear of track plates, whether they are broken or deformed, and the wear and tension of the track links. Excessive wear or slack in the tracks will affect the walking and working efficiency.
- Support Wheels, Carrier Rollers, Guide Wheels, Drive Wheels: Check whether the wheels are leaking oil, the wear of the wheel edges is uniform, and whether there are abnormal noises when they rotate. Damaged wheels need to be replaced, which can be costly.
- Track Tension: Check whether the track tension is appropriate. Too loose or too tight will affect the walking performance.
Leakage Check
- Hydraulic Oil: Check whether the hydraulic pump, multi-way valve, cylinders, and hydraulic pipe joints have obvious oil stains or leaks. Severe leakage may indicate problems with the hydraulic system.
- Diesel and Engine Oil: Check whether the fuel tank, oil pipes, and filters have leaks, and whether the engine oil is normal.
- Coolant: Check whether the radiator, pipes, and other parts have leakage.
Start and Static Check
- Cold Start Performance: Observe whether the start is smooth and whether the starter motor works normally. The color of exhaust smoke when starting can also provide clues about the engine’s health. A small amount of brief black smoke indicates incomplete combustion, while blue smoke may indicate burning oil.
- Engine Sound: Listen for any abnormal sounds from the engine, such as knocking or valve noises.
- Acceleration Response and Oil Pressure: Observe whether the engine responds quickly when accelerating and whether the speed is stable. Also, monitor whether the oil pressure and water temperature are within normal ranges.
Hydraulic System Static Check
Cylinder Self-Sagging: After shutting off the engine, observe whether the cylinders retract. Rapid sagging may indicate sealing problems in the cylinders.
Operation and Dynamic Test
- Smoothness and Speed: During operation, check whether the movements of the boom, arm, and bucket are smooth and stable. Delayed movements may indicate issues with the hydraulic system.
- Swing and Walking: Test the swing system and track walking to ensure the machine operates smoothly without abnormal noise or slipping.
Electrical and Control System
Dashboard and Function Switches: Check whether all indicators, alarm lights, and the dashboard work properly to ensure safety functions and operation systems are functioning without faults.
Documents and History Records
- Maintenance and Service Records: Review the maintenance and service history to see if any major repairs or replacement of key components have been carried out.
- Work Hours and Annual Inspection: Confirm whether the machine’s work hours are consistent with its usage, and check for any annual inspection and insurance records to ensure the equipment is legal and meets usage standards.
When choosing a second-hand excavator, selecting a reliable supplier is crucial. Anhui Chuangyang Engineering Machinery Co., Ltd. has many years of experience in import and export trade and offers various brands of second-hand excavators. The company adheres to the principle of integrity and provides excavadoras de segunda mano de alta calidad that undergo strict inspections and tests, ensuring excellent service and reliability for customers.