PC120‑6 No‑OEM‑PC120‑6‑Unloading‑Valve Unloading Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The PC120‑6 Unloading Valve (Part # No‑OEM‑PC120‑6‑Unloading‑Valve) is an important pressure‑protection component for PC120‑6 excavator hydraulic circuit. It releases redundant hydraulic pressure during standby status, reduces system load, protects pumps and other hydraulic parts, and solves typical failures including system over‑pressure, abnormal noise and high oil temperature.

• Factory Wholesale Price: $120 – $220 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel, precision grinding process, stable pressure setting, good sealing performance, long service life
• MOQ & Bulk Discount: 1 Unit, competitive price for large‑volume maintenance orders
• Lead Time: 1‑3 working days, sufficient stock supports worldwide logistics shipment
• Warranty: 12‑month replacement warranty, full hydraulic pressure testing completed before dispatch

2. Application Scope

Perfectly fits PC120‑6 excavator hydraulic system and construction machinery overhaul works:

• Hydraulic Overhaul: Direct replacement for worn, stuck or failed original unloading valve assembly.
• Pressure‑Fault Repair: Troubleshoot hydraulic over‑pressure, high oil temperature and abnormal system noise faults.
• Repair Workshop: Accurate dimensional match, convenient installation, reliable pressure‑releasing performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Unloading Valve Failure Troubleshooting

• Fault 1: Hydraulic System Overpressure, High Oil Temperature
  Cause: Valve spool wear, internal dirt blockage, spring fatigue deformation.
  Solution: Install brand‑new No‑OEM‑PC120‑6‑Unloading‑Valve unloading valve, flush hydraulic circuit and replace filter element.
• Fault 2: Machine Idle With Abnormal Hydraulic Noise
  Cause: Spool sticking, internal oil channel blocked by impurities.
  Solution: Fit PC120‑6 No‑OEM‑PC120‑6‑Unloading‑Valve unloading valve, thoroughly clean the whole hydraulic oil loop.
• Fault 3: Unloading Function Failure, Heavy Pump Load
  Cause: Internal component abrasion, pressure‑control spring damage.
  Solution: Replace complete unloading valve assembly, check hydraulic oil cleanliness condition.
• Fault 4: Oil Leakage At Unloading Valve External Joints
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Change full valve assembly 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 confirm excavator model, mounting dimension and system pressure parameters, provide No‑OEM‑PC120‑6‑Unloading‑Valve for fast compatibility verification.

Q2: What quality inspection will be carried out before goods dispatch?
A: Every PC120‑6 unloading valve undergoes strict hydraulic pressure test to guarantee stable pressure‑releasing performance.

Q3: What points need attention while installing unloading valve?
A: Keep mounting surface clean to prevent dirt entering valve interior, exhaust air from hydraulic circuit after finishing installation.