Komatsu Part FLANGE 07371-31255

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Product Overview

The 07371-31255 FLANGE is a genuine Komatsu OEM replacement flange from the 07371 prefix series. Flanges create bolted connections between hoses, tubes, and components — providing a robust, leak-tight joint that can be disassembled for service while withstanding system pressure, vibration, and thermal cycling. The flange's flat sealing face, when bolted to its mating component with a gasket or O-ring compressed between them, creates a continuous barrier against pressurized fluid escape.

Part Number: 07371-31255 Part Name: FLANGE Part Type: OEM Komatsu Replacement Component Availability: In stock

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When Flanges Fail

Flange connections fail most commonly because of surface damage to either the flange face or the mating component face. Even minor corrosion pitting or a scratch across the sealing area creates a leak path that the gasket or O-ring cannot fill. Over-tightening bolts can warp the flange, causing it to lift at the edges and creating a wedge-shaped gap. Uneven bolt torque produces the same effect — one side of the flange compresses the seal completely while the other side barely contacts, and the resulting leak is often misdiagnosed as a gasket failure when the real cause is uneven bolt loading. Replace the 07371-31255 when the sealing face shows pitting, scoring, or corrosion; when bolt holes are elongated or cracked around their edges; when the flange is warped or no longer flat; or when the threads for the retaining bolts are damaged.

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Installation

1. Confirm 07371-31255 in your Komatsu parts catalog
2. Clean both sealing faces completely — old gasket material and debris prevent sealing
3. Install a new gasket or O-ring — lubricate the seal if specified
4. Align the flange — it must seat flat without being forced
5. Tighten bolts in a cross-pattern sequence to the specified torque — this ensures even compression of the seal
6. Pressure test — check the flange joint for leaks during system operation

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Request a Quote

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