PC300 Main Relief Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The PC300 Main Relief Valve is the central pressure‑regulating element of excavator hydraulic system. It sets the maximum working pressure for whole hydraulic circuit, protects hydraulic pump and actuators against over‑pressure. Common replacement symptoms include weak digging force, insufficient machine power, high system heat, pressure instability and hydraulic component damage.

• Factory Wholesale Price: $125 – $218 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel body, precision internal spool assembly, precise pressure setting, excellent wear‑resistance and sealing performance, long working 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 excavator hydraulic system and construction machinery overhaul projects:

• Hydraulic Overhaul: Direct replacement for worn, stuck or damaged original main relief valve assembly.
• Hydraulic Fault Repair: Fix weak digging, power shortage and hydraulic over‑pressure related failures.
• Repair Workshop: Accurate dimension matching, simple installation, stable pressure‑regulating 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: Excavator Digging Force Weak & Machine Power Insufficient
  Cause: Internal spool wear, spring fatigue, dirt trapped inside valve clearance.
  Solution: Install brand‑new PC300 Main Relief Valve, flush hydraulic circuit and replace hydraulic filter.
• Fault 2: Hydraulic System Pressure Unstable, Easy Over‑pressure
  Cause: Valve core abrasion, internal spring performance degradation.
  Solution: Fit PC300 Main Relief Valve, thoroughly clean the whole hydraulic oil circuit.
• Fault 3: Hydraulic System Serious Overheat & Abnormal Vibration
  Cause: Internal component wear, oil passages blocked by hydraulic contamination.
  Solution: Replace complete main relief valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Main Relief Valve Mounting Position
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Replace full main relief valve assembly or matching 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 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 Main Relief Valve goes through strict hydraulic test to guarantee accurate main pressure‑regulating performance.

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