PC300‑7 Holding Valve Compatible with Excavator

1. Product Overview & Wholesale Price Range

The PC300‑7 Holding Valve is an important pressure‑keeping element of excavator hydraulic system. It locks and maintains hydraulic circuit pressure to prevent boom, arm or bucket drifting under load. Common replacement symptoms include working attachment drifting, pressure drop, load holding failure and hydraulic control malfunctions.

• Factory Wholesale Price: $118 – $205 USD Direct factory price for hydraulic repair workshops
• Material Specifications: High‑strength alloy steel body, precision internal spool assembly, stable pressure‑keeping effect, 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 PC300‑7 excavator hydraulic system and construction machinery overhaul projects:

• Hydraulic Overhaul: Direct replacement for worn, stuck or damaged original holding valve assembly.
• Hydraulic Fault Repair: Solve boom/arm drifting, pressure loss and load‑holding related failures.
• Repair Workshop: Accurate dimension matching, simple installation, reliable pressure‑keeping performance.
• Overseas Parts Dealer: Stable inventory supply, complete QC records support cross‑border spare‑parts trading.

3. Common Holding Valve Failure Troubleshooting

• Fault 1: Excavator Boom / Arm / Bucket Drifting Obvious
  Cause: Internal spool wear, spring fatigue, dirt trapped inside valve clearance.
  Solution: Install brand‑new PC300‑7 Holding Valve, flush hydraulic circuit and replace hydraulic filter.
• Fault 2: Hydraulic Pressure Cannot Be Maintained, Load Sinking
  Cause: Valve core abrasion, internal spring performance degradation.
  Solution: Fit PC300‑7 Holding Valve, thoroughly clean the whole hydraulic oil circuit.
• Fault 3: Hydraulic System Generates Abnormal Noise & Overheat
  Cause: Internal component wear, oil passages blocked by hydraulic contamination.
  Solution: Replace complete holding valve assembly, check hydraulic oil cleanliness.
• Fault 4: Oil Leakage At Holding Valve Mounting Position
  Cause: Seal ring aging, mating surface scratch damage.
  Solution: Replace full holding valve assembly or matching seal repair kit.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this holding 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 PC300‑7 Holding Valve goes through strict hydraulic test to guarantee stable pressure‑keeping performance.

Q3: What points need attention while installing holding valve?
A: Keep mounting surface and oil ports clean to prevent dirt entering valve interior, test pressure‑holding effect and machine lifting performance after installation.