EC480 No‑OEM‑EC480‑Main Main Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The EC480 Main Relief Valve (Part # No‑OEM‑EC480‑Main) acts as main overflow valve for excavator main hydraulic system. It sets maximum working pressure of complete hydraulic system, absorbs pressure impact and safeguards main hydraulic pump and other core hydraulic components.

• Factory Wholesale Price: $122 – $222 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding, anti‑wear property, stable pressure‑holding performance, extended service cycle
• MOQ & Bulk Discount: 1 Unit, favorable quotation for bulk maintenance orders
• Lead Time: 1‑3 working days, adequate stock supports global logistics shipment
• Warranty: 12‑month replacement warranty, full hydraulic pressure test completed before shipment

2. Application Scope

Perfectly matched for EC480 excavator main hydraulic system and engineering machinery overhaul jobs:

• Hydraulic Overhaul: Direct replacement for worn, stuck or malfunctioning original main relief valve.
• Whole‑machine Pressure Protection: Restrict maximum system hydraulic pressure, protect main pump and hydraulic parts from over‑pressure failure.
• Repair Workshop: Excellent dimensional compatibility, easy installation, stable pressure‑regulating performance.
• Overseas Parts Dealer: Stable stock supply, complete QC inspection records support cross‑border spare‑parts trading.

3. Common Main Relief Valve Failure Troubleshooting

• Fault 1: Excavator All Operations Weak, Low System Hydraulic Pressure
  Cause: Valve spool wear, internal impurity clogging, spring fatigue deformation.
  Solution: Install new No‑OEM‑EC480‑Main main relief valve, clean hydraulic oil circuit and replace filter element.
• Fault 2: Hydraulic System Over‑pressure, Risk Of Main Pump Damage
  Cause: Valve spool jamming, main pressure‑control function failure.
  Solution: Fit EC480 No‑OEM‑EC480‑Main main relief valve, calibrate whole‑machine hydraulic pressure to standard value after assembly.
• Fault 3: Obvious Hydraulic Noise & Vibration During Machine Operation
  Cause: Internal component abrasion, unstable overflow pressure.
  Solution: Replace complete valve assembly, inspect hydraulic oil cleanliness.
• Fault 4: Hydraulic Oil Leakage At Thread Connection Position
  Cause: Sealing ring aging, thread surface scratch damage.
  Solution: Replace whole valve unit or matching seal repair kit.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this main relief valve fits my excavator?
A: Please verify machine model, thread size and system pressure parameter, provide part number No‑OEM‑EC480‑Main for fast compatibility check.

Q2: What quality tests are done before shipment?
A: Each EC480 No‑OEM‑EC480‑Main main relief valve goes through full hydraulic pressure test to ensure stable main pressure‑limiting performance.

Q3: What should you pay attention to during installation?
A: Keep mounting surface clean to prevent dirt entering valve interior, recalibrate whole‑machine hydraulic pressure after installation work.