EC290 No‑OEM‑EC290 Main Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The EC290 Main Relief Valve (Part # No‑OEM‑EC290) is main overflow valve for excavator main hydraulic system. It sets the maximum system working pressure, prevents over‑pressure impact and protects main pump and all connected hydraulic actuators.

• Factory Wholesale Price: $106 – $192 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding, anti‑abrasion, stable pressure‑regulating performance, long working service life
• MOQ & Bulk Discount: 1 Unit, favorable price for bulk maintenance orders
• Lead Time: 1‑3 working days, adequate stock supports worldwide logistics shipment
• Warranty: 12‑month replacement warranty, full hydraulic pressure test completed before goods delivery

2. Application Scope

Designed for EC290 excavator main hydraulic system and engineering machinery overhaul:

• Hydraulic Overhaul: Direct replacement for worn, stuck or failed original main relief valve.
• Whole‑machine Pressure Protection: Limit maximum hydraulic system pressure, protect main pump and hydraulic components from over‑pressure damage.
• Repair Workshop: Good dimensional compatibility, convenient installation, stable overflow pressure performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Main Relief Valve Failure Troubleshooting

• Fault 1: Whole Machine Weak Action, Low System Working Pressure
  Cause: Spool wear, internal impurity blockage, spring fatigue deformation.
  Solution: Install new EC290 main relief valve, clean hydraulic oil circuit and replace filter element.
• Fault 2: System Over‑pressure, Risk Of Hydraulic Component Burst Damage
  Cause: Valve spool stuck, pressure‑control function invalid.
  Solution: Fit EC290 No‑OEM‑EC290 main relief valve, calibrate whole‑machine hydraulic pressure to factory standard value after assembly.
• Fault 3: Severe Hydraulic Noise & Vibration During Machine Operation
  Cause: Internal parts abrasion, unstable overflow pressure.
  Solution: Replace complete valve assembly, check hydraulic oil cleanliness condition.
• Fault 4: Oil Leakage At Valve Thread Connection Joint
  Cause: Sealing ring aging, thread scratch damage.
  Solution: Change whole valve or supporting 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 confirm machine model, thread dimension and pressure parameter, provide part number No‑OEM‑EC290 for fast compatibility verification.

Q2: What quality tests are carried out before shipment?
A: Each EC290 main relief valve passes strict hydraulic pressure test to guarantee reliable pressure‑limiting performance.

Q3: What points need attention during installation?
A: Keep mounting position clean, prevent dirt entering valve interior, recalibrate whole‑machine hydraulic pressure after installation.