EX55 No‑OEM‑EX55‑Unloading‑Valve Unloading Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The EX55 Unloading Valve (Part # No‑OEM‑EX55‑Unloading‑Valve) is specialized pressure release control valve for EX55 excavator hydraulic system. It releases idle circuit pressure during standby status, reduces pump load and oil temperature, improves the service life of hydraulic pumps and related components.

• Factory Wholesale Price: $90 – $170 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding, anti‑wear property, stable unloading performance, long 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 EX55 excavator main hydraulic system and engineering machinery overhaul jobs:

• Hydraulic Overhaul: Direct replacement for worn, stuck or pressure‑abnormal original unloading valve.
• System Load Reduction: Release idle pressure, lower hydraulic oil temperature, protect main pump and hydraulic accessories.
• Repair Workshop: Excellent dimensional compatibility, convenient installation, reliable pressure‑regulating performance.
• Overseas Parts Dealer: Stable stock supply, complete QC inspection records support cross‑border spare‑parts trading.

3. Common Unloading Valve Failure Troubleshooting

• Fault 1: High Hydraulic Oil Temperature, Pump Over‑load
  Cause: Valve spool wear, internal impurity clogging, spring fatigue deformation.
  Solution: Install new No‑OEM‑EX55‑Unloading‑Valve unloading valve, clean hydraulic oil circuit and replace filter element.
• Fault 2: Machine Standby Pressure Too High, Weak Working Action
  Cause: Valve spool jamming, unloading pressure‑release function failure.
  Solution: Fit EX55 No‑OEM‑EX55‑Unloading‑Valve unloading valve, calibrate system unloading pressure to standard value after assembly.
• Fault 3: Obvious Hydraulic Noise & Vibration During Idle Status
  Cause: Internal component abrasion, unstable unloading pressure.
  Solution: Replace complete valve assembly, inspect hydraulic oil cleanliness condition.
• Fault 4: Hydraulic Oil Leakage At Thread Connection Joint
  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 unloading valve fits my excavator?
A: Please verify machine model, thread dimension and system pressure parameter, provide part number No‑OEM‑EX55‑Unloading‑Valve for fast compatibility check.

Q2: What quality tests are done before shipment?
A: Each EX55 unloading valve goes through dedicated hydraulic pressure test to guarantee stable pressure‑release performance.

Q3: What should you pay attention to during installation?
A: Keep mounting surface clean to prevent dirt entering valve interior, recalibrate unloading pressure after finishing installation.