| Applicable Machine Information | 20-ton class hydraulic excavator; verify the exact machine serial number and production configuration before ordering. | 30-ton class hydraulic excavator; verify the exact machine serial number and production configuration before ordering. | Required Provide model, serial number, operating hours, part name, part number, photographs, and application symptoms. | Keep the approved part list and serial-number records for future replacement planning. |
| Common Replacement Parts | Filters, hydraulic hoses, seals, undercarriage parts, swing components, travel components, electrical sensors, and engine-related service parts. | Filters, hydraulic hoses, seals, undercarriage parts, swing components, travel components, electrical sensors, and engine-related service parts. | Confirm dimensions, connection type, tooth or bolt pattern, voltage, pressure rating, and material before quotation approval. | Use a replacement schedule based on operating hours, working environment, and observed wear rather than calendar time alone. |
| Part Number Verification | Check the number against the machine serial range and the removed component. | Check the number against the machine serial range and the removed component. | Inspection Point Part numbers can vary by production year, regional configuration, attachment, and system revision. | Record superseded numbers and approved alternatives together with compatibility notes. |
| Hydraulic Component Inspection | Inspect pumps, valves, cylinders, hoses, seals, and fittings for pressure compatibility and leakage risk. | Inspect pumps, valves, cylinders, hoses, seals, and fittings for pressure compatibility and leakage risk. | Review pressure rating, port size, sealing method, surface finish, cleanliness, and test documentation. | Request technical troubleshooting support when abnormal noise, heat, drift, slow movement, or repeated leakage occurs. |
| Undercarriage Inspection | Check track links, rollers, idlers, sprockets, shoes, bolts, and track tension before replacement. | Check track links, rollers, idlers, sprockets, shoes, bolts, and track tension before replacement. | Measure wear where possible and compare both sides of the undercarriage to identify uneven loading or alignment problems. | Provide installation guidance and recommended running-in procedures after undercarriage replacement. |
| Electrical and Sensor Parts | Verify connector shape, pin arrangement, voltage range, signal type, thread size, and cable length. | Verify connector shape, pin arrangement, voltage range, signal type, thread size, and cable length. | Required Do not rely on appearance alone; compare the connector and electrical specifications with the removed part. | Offer fault-code interpretation and installation checks while protecting connectors from moisture and contamination. |
| Visual Quality Inspection | Check casting, machining, coating, welds, threads, sealing faces, and overall dimensions. | Check casting, machining, coating, welds, threads, sealing faces, and overall dimensions. | Inspection Point Reject parts with cracks, deep corrosion, damaged threads, distorted sealing surfaces, or incomplete finishing. | Retain inspection photographs, measurement records, packaging photographs, and batch references. |
| Functional Testing | Use bench testing where applicable for pumps, motors, valves, cylinders, starters, alternators, and sensors. | Use bench testing where applicable for pumps, motors, valves, cylinders, starters, alternators, and sensors. | Request test results that identify test conditions, measured values, acceptance criteria, and test date. | Provide test-result review and corrective-action support if the installed component does not perform as expected. |
| Packaging Requirements | Use sealed protection for precision parts and reinforced packaging for heavy or sharp-edged components. | Use sealed protection for precision parts and reinforced packaging for heavy or sharp-edged components. | Confirm labels, quantity, part number, handling marks, moisture protection, and package condition before dispatch. | Keep delivery photographs and unpacking records to support damage or shortage claims. |
| Order Confirmation | Confirm model, serial number, quantity, specifications, delivery address, and installation application. | Confirm model, serial number, quantity, specifications, delivery address, and installation application. | Recommended Issue a written order confirmation before production or shipment, especially for non-standard components. | Maintain a clear communication record for quotation, approval, dispatch, and technical questions. |
| Delivery Planning | Prioritize filters, seals, hoses, and other maintenance parts according to planned service intervals. | Prioritize filters, seals, hoses, and other maintenance parts according to planned service intervals. | Separate standard-stock items from made-to-order or inspection-dependent items in the delivery plan. | Provide shipment tracking, packing lists, and advance notice of any delay or specification change. |
| Installation Support | Follow the machine service documentation for torque, cleanliness, fluid handling, and adjustment procedures. | Follow the machine service documentation for torque, cleanliness, fluid handling, and adjustment procedures. | Clean hydraulic lines, protect open ports, use suitable tools, and verify alignment before commissioning. | Support commissioning checks, leakage inspection, initial operation monitoring, and installation feedback. |
| Warranty Documentation | Keep the invoice, part number, serial-number confirmation, installation date, and operating information. | Keep the invoice, part number, serial-number confirmation, installation date, and operating information. | Required Warranty evaluation normally depends on evidence of correct part selection, installation, and operating conditions. | Define the claim process, required evidence, inspection method, and resolution options before purchase. |
| Failure and Return Handling | Document the symptom, operating conditions, error information, photographs, and removed-part condition. | Document the symptom, operating conditions, error information, photographs, and removed-part condition. | Do not disassemble or discard a suspected defective part before technical review unless safety requires it. | Use root-cause analysis to distinguish product defects from contamination, incorrect installation, overload, or related-system failures. |
| Recommended Supplier Evaluation | Assess technical verification, dimensional accuracy, material consistency, inspection records, and parts traceability. | Assess technical verification, dimensional accuracy, material consistency, inspection records, and parts traceability. | Compare documentation quality, response time, sample inspection results, packaging standards, and replacement policy. | Select a supplier that can provide consistent records and technical communication, not only a low purchase price. |