LiuGong907 | Main Relief Valve | Hydraulic Main Overflow Control Valve Compatible with LiuGong

1. Product Overview & Wholesale Price Range

LiuGong907 Main Relief Valve is the core pressure‑limiting component of excavator main hydraulic circuit. It undertakes system pressure stabilization and overflow protection functions. Common replacement scenarios include abnormal high hydraulic pressure, overflow noise, valve spool sticking, internal leakage and insufficient working power.

• Factory Wholesale Price: $112 – $172 USD Direct factory price for excavator repair workshops
• Material Specifications: High‑strength alloy valve body, precision‑machined spool, wear‑resistant spring assembly, excellent pressure‑resistance performance, anti‑sticking, long service life
• Fit Application: Main hydraulic circuit compatible with LiuGong907 excavator
• MOQ & Bulk Discount: 1 Unit, preferential quotation for bulk maintenance orders
• Lead Time: 1‑3 working days, sufficient stock supports worldwide logistics shipment
• Warranty: 12‑month replacement warranty, pressure‑resistance and sealing testing completed before shipment

2. Application Scope

This main relief valve is specially produced for LiuGong907 excavator hydraulic maintenance:

• Hydraulic Circuit Overhaul: Direct replacement for original damaged main relief valve assembly.
• Hydraulic Fault Repair: Resolve abnormal high‑pressure, overflow noise, spool sticking and internal leakage problems.
• Repair Workshop Usage: Exact matching installation dimension, convenient installation, stable pressure‑limiting and overflow performance.
• Overseas Parts Reseller: Adequate inventory, complete QC records to support cross‑border excavator spare‑part trading business.

3. Common Main Relief Valve Failure Troubleshooting

• Fault 1: Hydraulic System Abnormal High‑Pressure
  Cause: Spring fatigue failure, spool clamping stagnation, hydraulic oil mixed with impurities.
  Solution: Install brand‑new main relief valve, flush hydraulic circuit and replace hydraulic filter element.
• Fault 2: Overflow Noise & Vibration
  Cause: Internal parts wear, foreign debris stuck inside valve body, spring deformation.
  Solution: Replace complete main relief valve assembly, clean the whole hydraulic oil loop.
• Fault 3: Valve Spool Sticking
  Cause: Metal debris and oil dirt enter valve interior, component deformation.
  Solution: Fit new main relief valve, thoroughly clean hydraulic tank and oil passages.
• Fault 4: Internal Leakage of Main Valve Assembly
  Cause: Sealing surface scratch, long‑term high‑pressure impact damage.
  Solution: Replace main relief valve, inspect wear condition of matched hydraulic pipelines.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How can I confirm this main relief valve fits LiuGong907 excavator?
A: Confirm your machine model is LiuGong907, double‑check thread size and installation dimension parameters before placing orders.

Q2: What quality testing will be done before goods delivery?
A: Each main relief valve completes pressure‑resistance and sealing performance testing before shipment.

Q3: What precautions should be followed during installation?
A: Clean valve body and mounting surface thoroughly, prevent dirt entering hydraulic oil circuit, test pressure‑limiting function after installation.