PC300‑400 Swing Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The PC300‑400 Swing Relief Valve is a core pressure‑limiting element for excavator swing hydraulic circuit. It limits swing system pressure to protect swing motor and related hydraulic components. Common replacement symptoms include weak swing rotation, slow slewing, abnormal swing noise, over‑pressure and swing function failure.

• Factory Wholesale Price: $112 – $196 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel body, precision internal spool assembly, accurate pressure‑limiting performance, excellent wear‑resistance and sealing performance, long service life
• MOQ & Bulk Discount: 1 Unit, favorable price 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 PC300‑400 excavator hydraulic system and construction machinery overhaul projects:

• Hydraulic Overhaul: Direct replacement for worn, stuck or damaged original swing relief valve assembly.
• Hydraulic Fault Repair: Resolve weak swing, slow slewing and swing‑circuit over‑pressure failures.
• Repair Workshop: Accurate dimension matching, simple installation, reliable pressure‑limiting performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Swing Relief Valve Failure Troubleshooting

• Fault 1: Excavator Swing Rotation Weak & Slewing Slow
  Cause: Internal spool wear, spring fatigue, dirt trapped inside valve clearance.
  Solution: Install brand‑new PC300‑400 Swing Relief Valve, flush hydraulic circuit and replace hydraulic filter.
• Fault 2: Swing System Abnormal Noise, Over‑pressure Risk
  Cause: Valve core abrasion, internal spring performance degradation.
  Solution: Fit PC300‑400 Swing Relief Valve, thoroughly clean the whole hydraulic oil circuit.
• Fault 3: Hydraulic System Generates Overheat & Unusual Vibration
  Cause: Internal component wear, oil passages blocked by hydraulic contamination.
  Solution: Replace complete swing relief valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Swing Relief Valve Mounting Position
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Replace full swing relief valve assembly or matching seal repair kit.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this swing relief valve fits my excavator?
A: Please confirm excavator model, installation dimension and technical parameters for fast compatibility verification.

Q2: What quality inspection will be carried out before goods dispatch?
A: Every PC300‑400 Swing Relief Valve goes through strict hydraulic test to guarantee stable swing pressure‑limiting performance.

Q3: What points need attention while installing swing relief valve?
A: Keep mounting surface and oil ports clean to prevent dirt entering valve interior, test swing power and slewing function after installation.