Main Relief Valve 31N8‑17390 For Hyundai Crawler Excavator R305‑7

Keywords: 31N8‑17390, Main Relief Valve, Hyundai Excavator Relief Valve, R305‑7 Hydraulic Parts, Excavator Main Overflow Valve, Construction Machinery Hydraulic Spare Parts

🔹Product Overview

This heavy‑duty main relief valve 31N8‑17390 is a core hydraulic pressure‑control component specially designed for Hyundai crawler excavator R305‑7. It is installed inside the hydraulic main control valve system, used to limit the maximum working pressure of the hydraulic circuit, protect hydraulic pumps, motors and other hydraulic components from damage caused by overpressure. Made of high‑strength alloy steel with precision‑machined valve spool, durable sealing components and strict pressure calibration. It can effectively solve common hydraulic faults such as weak digging force, unstable pressure, hydraulic system over‑pressure alarm, oil leakage and slow operation speed. It is the ideal aftermarket replacement part for excavator hydraulic system maintenance and overhaul.

🔹Detailed Specifications

🔹Key Features & Advantages

• Exact OEM Dimension & Pressure Setting Fully consistent with original installation size, thread secification and pressure parameters, direct plug‑and‑fit installation without modification.
• High‑Strength Alloy Steel Body High hardness, strong wear‑resistance, anti‑deformation, long‑term stable performance under high‑pressure hydraulic working environment.
• Precisely‑Ground Valve Spool High‑precision matching clearance, sensitive pressure response, effectively prevent pressure drifting, pressure lag and internal oil leakage.
• High‑Quality Sealing Kits Excellent oil‑resistance and aging‑resistance, greatly reduce external leakage risk, adapt to long‑time high‑temperature hydraulic oil circulation.
• Strict Hydraulic Performance Testing Every finished relief valve undergoes pressure calibration, leakage inspection and opening‑pressure testing before delivery.
• Efficient Hydraulic‑Fault Repair Quickly replace worn‑out or broken original main relief valve, restore excavator digging power, minimize machine downtime and cut maintenance costs.

🔹Application Scope

Compatible Hyundai Excavator Model: ‑ R305‑7 Mainly used for the main control hydraulic circuit pressure protection of Hyundai R305‑7 crawler excavator. Solve problems including weak breakout force, slow boom movement, hydraulic over‑pressure warning, abnormal hydraulic noise.

🔹Our Company Advantage

We are a professional supplier of full‑range excavator and heavy‑duty construction machinery spare parts. We supply main relief valves, control valves, hydraulic pumps, travel motors, swing motors, wiring harnesses, sensors and undercarriage spare‑parts for Hyundai, Doosan, Yanmar, Hitachi, Komatsu, Sany, Cater-pillar, and other well‑known machinery brands. ‑ Large‑scale inventory of Hyundai excavator hydraulic spare‑parts ‑ Factory‑direct competitive wholesale price ‑ Fast shipment for in‑stock goods ‑ Support mixed‑order & one‑stop spare‑parts procurement ‑ Professional part‑number matching technical support service

🔹Packaging & Shipping ‑

Individual anti‑rust oil treatment + sealed plastic bag + foam shock‑proof inner protection ‑ Outer reinforced hard carton for long‑distance sea‑transport protection ‑ Multiple shipping solutions: sea freight, air freight, express courier for small trial orders ‑ Export documents (Commercial Invoice, Packing List) can be provided.

🔹Contact Us

If you need more Hyundai excavator hydraulic valves, hydraulic spare‑parts or other heavy machinery replacement components, please send your parts list to us. We will send you our best quotation promptly.