YC85 Excavator Unloading Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The YC85 Excavator Unloading Valve is critical pressure‑release spare part for excavator hydraulic pump loop. It discharges redundant hydraulic pressure to stabilize system pressure and lower oil temperature. Common replacement symptoms include high hydraulic oil temperature, slow implement movement, pressure fluctuation and insufficient working power.

• Factory Wholesale Price: $138 – $220 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel valve body, precision‑ground spool and heavy‑duty spring assembly, stable pressure‑releasing performance, superior wear‑resistance and sealing performance, long service life
• MOQ & Bulk Discount: 1 Unit, favorable quotation for large‑volume maintenance orders
• Lead Time: 1‑3 working days, sufficient stock supports worldwide logistics delivery
• Warranty: 12‑month replacement warranty, full hydraulic pressure testing completed before shipment

2. Application Scope

Perfectly matches YC85 excavator main hydraulic system and construction‑machinery overhaul projects:

• Hydraulic Overhaul: Direct replacement for worn, stuck or damaged original unloading valve assembly.
• Hydraulic Fault Repair: Resolve high oil temperature, slow working actions and hydraulic pressure fluctuation failures.
• Repair Workshop: Precise dimension matching, simple installation, dependable 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: Excavator High Hydraulic Oil Temperature
  Cause: Internal spool wear, spring fatigue, dirt trapped inside valve clearance.
  Solution: Install brand‑new Unloading Valve, flush hydraulic circuit and replace hydraulic filter.
• Fault 2: Slow Working Action & Unstable System Pressure
  Cause: Valve core abrasion, internal spring performance degradation.
  Solution: Fit Unloading Valve, thoroughly clean the whole hydraulic oil circuit.
• Fault 3: Weak Digging Force & Abnormal Hydraulic Noise
  Cause: Internal component wear, oil passages blocked by hydraulic contamination.
  Solution: Replace complete unloading valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Unloading Valve Mounting Position
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Replace full unloading 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 and installation dimension for fast compatibility verification.

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

Q3: What points need attention while installing unloading valve?
A: Keep mounting surface and oil ports clean to prevent dirt entering valve interior, test system pressure after installation.