Komatsu part VALVE 56D 50 31320

Product Overview

The 56D-50-31320 VALVE is a genuine Komatsu OEM replacement valve from the 56D prefix series. Valves control the flow, pressure, and direction of hydraulic oil in your machine's systems — they're the precision components that translate the operator's commands into the smooth, powerful movements that do the work.

Part Number: 56D-50-31320 Part Name: VALVE Part Type: OEM Komatsu Replacement Component Availability: In stock

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When Valves Need Replacement

Hydraulic valves operate in an environment where contamination is the enemy. A single particle of dirt or wear debris that becomes trapped in the micron-level clearance between a valve spool and its bore can score both surfaces, creating a permanent internal leak path. Over time, this internal leakage accumulates — oil bypasses the spool rather than doing useful work, the machine becomes sluggish, and the hydraulic oil temperature rises from the energy dissipated through the leak. Springs inside the valve fatigue, changing the cracking or centering force. Seals degrade from heat and pressure cycling, causing external leaks. Replace the 56D-50-31320 when the function controlled by this valve is sluggish, unresponsive, or inconsistent; when internal leakage is detected through flow testing; when there is external oil leakage from the valve body or spool seals; or when physical damage to the valve body, ports, or spool ends is visible.

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Installation

Confirm 56D-50-31320 in your Komatsu parts catalog

Clean the mounting surface and all port threads

Install new seals on every port and mounting face

Position and secure the valve — tighten in sequence to the specified torque

Connect hydraulic lines to the correct ports — verify against the hydraulic schematic

Bleed air from the circuit before full operation

Test all functions through their full range and check for leaks

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Komatsu part BALL BEARING 06000 06015

July 24, 2026