Sunward50 | Sunward50‑Main‑Relief‑Valve | Main Relief Valve Compatible with Sunward

1. Product Overview & Wholesale Price Range

Sunward50 Main Relief Valve is a key pressure‑limiting component for excavator main hydraulic circuit. It controls main‑loop working pressure and provides overflow protection. Common replacement scenarios include insufficient digging power, system pressure instability, valve spool sticking, internal leakage and abnormal overflow noise fault.

• Factory Wholesale Price: $98 – $152 USD Direct factory price for excavator repair workshops
• Material Specifications: High‑strength alloy valve body, precision‑ground spool assembly, wear‑resistant spring group, stable pressure‑resistance and anti‑sticking property, long working service life
• MPN / Part Parameter:Sunward50‑Main‑Relief‑Valve
• Fit Application: Main hydraulic circuit compatible with Sunward50 excavator
• MOQ & Bulk Discount: 1 Unit, favorable price for bulk maintenance orders
• Lead Time: 1‑3 working days, sufficient stock supports global logistics shipment
• Warranty: 12‑month replacement warranty, pressure‑resistance and sealing test finished before shipment

2. Application Scope

This main relief valve is customized for Sunward50 excavator hydraulic overhaul:

• Main Circuit Overhaul: Direct replacement for original damaged main relief valve assembly.
• Hydraulic Fault Repair: Fix digging weakness, system pressure fluctuation, spool sticking and internal leakage malfunctions.
• Repair Workshop Usage: Accurate mounting dimension, simple installation, reliable pressure‑limiting and overflow performance.
• Overseas Parts Reseller: Stable stock quantity, complete QC documents to support cross‑border excavator spare‑part business.

3. Common Main Relief Valve Failure Troubleshooting

• Fault 1: Excavator Digging Weak & Insufficient Power
  Cause: Spring fatigue, spool wear, hydraulic oil mixed with impurities.
  Solution: Install brand‑new main relief valve, flush hydraulic circuit and replace filter element.
• Fault 2: Main Circuit Pressure Fluctuation & Overflow Noise
  Cause: Internal component abrasion, foreign particles 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 sludge enter valve interior, part 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, check wear condition of matched hydraulic pipelines.

4. Matching Hydraulic Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I verify this main relief valve fits Sunward50 excavator?
A: Confirm machine model is Sunward50, check thread size and installation dimension parameters before placing orders.

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

Q3: What points need attention during installation?
A: Clean valve body and mounting surface completely, avoid dirt entering hydraulic circuit, test main‑loop pressure‑limiting performance after installation.