31N6-17520 Overload Relief Valve Assembly | Hydraulic Safety Valve for Hyundai 7-Series Excavators

Product Overview

The 31N6-17520 overload relief valve assembly is a critical hydraulic component designed for Hyundai construction excavators. Mounted directly on the main control valve (MCV), this valve limits the maximum working pressure within hydraulic circuits. It safeguards hydraulic motors, cylinders and pipeline systems from damage caused by pressure spikes and sudden external impact, especially built as a dedicated hydraulic part for long reach boom versions of target machines.

Key Specifications

FAQs

Q: Which excavator models fit the 31N6-17520 overload relief valve?

A: It suits Hyundai 7-Series medium crawler excavators, including R210LC-7, R210LC-7H, R220LC-7, R220LC-7H. It also fits certain regional export models such as RD210-7 and RD220-7 for India market.

Q: What symptoms indicate this overload relief valve needs replacement?

A: Visible warning signs include weak boom or arm movement, abnormal noise during heavy load operation, hydraulic overheating, sudden pressure surges and oil leakage around the main control valve.

Q: What is the difference between 31N6-17520 and 31N6-17510?

A: 31N6-17520 is the long reach boom dedicated overload relief valve, while 31N6-17510 is the standard version. They are often installed on different ports of the multi-way valve and work together for circuit protection.

Q: Where is this overload relief valve installed and what does it protect?

A: It is fitted on the main control valve. It protects hydraulic cylinders, hydraulic motors and connecting pipelines by cutting off abnormal high pressure triggered by external impact loads.

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