Remanufacturing Sany 305

1. General Requirements

Performance ≥ 90% of original factory specification

Safety performance 100% compliant

No oil leakage, coolant leakage, or electrical faults

Smooth and coordinated operation

No abnormal vibration or noise

Complete inspection and service records available

2. Structural Components

Upper frame and undercarriage frame free of cracks

Boom and arm free of structural cracks

All welds free of defects

Pin bores restored to standard tolerance

Pins and bushings within clearance limits

Slewing ring mounting surface flat and compliant

3. Engine Requirements

Full disassembly and inspection required

Cylinder block and head free of cracks

Crankshaft and cylinder bores within tolerance

Replacement of:

Piston rings

Bearings

All seals and gaskets

Fuel system tested or calibrated

Turbocharger inspected and compliant

Engine test passed:

Stable oil pressure

No abnormal smoke

No abnormal noise

4. Hydraulic System

Main pump disassembled and inspected

Main control valve inspected

Swing motor inspected

Travel motor inspected

All cylinder seals replaced

Internal leakage within acceptable limits

System pressure meets specification

No abnormal vibration or overheating

5. Undercarriage

Track chain wear within limits

Sprocket wear within limits

Rollers functioning normally

Idler functioning normally

Tensioning system operational

No tracking deviation

6. Electrical System

Wiring harness intact and undamaged

ECU system functioning properly

All instruments operational

Alarm system functional

Starting system reliable

Lights, wipers, and air conditioning operational

7. Machine Performance

Normal engine start (cold and hot)

Stable idle speed

Smooth swing operation

Strong travel performance

Adequate digging force

Reliable braking

Smooth combined operations

8. Sealing Requirements

No dripping leakage

No visible oil seepage

All joints dry and sealed

9. Testing Requirements

Static inspection passed

Functional (dynamic) test passed

Continuous operation ≥ 2 hours

No alarms during operation

No overheating

No abnormal noise

10. Fluids

Hydraulic oil replaced or compliant

Engine oil replaced

Coolant replaced

Fluid cleanliness within standard

11. Appearance

Uniform repainting

Clear identification and labeling

Cabin in good condition

All controls intact

12. Delivery Documentation

Remanufactured nameplate

Serial number

Inspection report

Parts replacement list

Test report

Operation manual

Warranty document