Komatsu Part SEAL RING 07018-11155

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Product Overview

The 07018-11155 SEAL RING is a genuine Komatsu OEM replacement seal ring. Seal rings create leak-tight barriers between components in your machine's hydraulic and drivetrain systems — they seal rotating shafts, sliding pistons, and stationary housing interfaces against pressurized fluid escape and contamination ingress. Unlike O-rings that seal primarily through compression, many seal rings use a combination of controlled clearance, spring tension, and pressure activation to maintain their sealing contact as system pressure cycles from zero to maximum.

Part Number: 07018-11155 Part Name: SEAL RING Part Type: OEM Komatsu Replacement Seal Availability: In stock — ready to ship

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When to Replace

Seal rings degrade through several mechanisms over their service life. Friction against the rotating or sliding mating surface gradually wears the ring face, opening the seal clearance until fluid can bypass. Heat from the system or operating environment hardens the ring material, reducing its ability to conform to the mating surfaces under pressure. Physical damage — a nick, scratch, or embedded contamination on the sealing face — creates a direct leak path. And in rare but serious cases, a seal ring can fracture from pressure spikes or material fatigue. Replace the 07018-11155 when fluid is leaking past the sealed interface; when the ring shows wear, cracking, or deformation; when cuts, nicks, or surface scoring are visible on the ring; or whenever the component is disassembled for any service — seal rings should be replaced every time the assembly is opened.

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Installation

1. Confirm 07018-11155 in your Komatsu parts catalog
2. Clean the groove and all mating surfaces — contamination trapped during assembly causes immediate failure
3. Lubricate the seal ring with clean system fluid before installation — this prevents dry-start damage
4. Install in the correct orientation — many seal rings have a directional profile that must face the pressure side
5. Assemble carefully — avoid nicking, rolling, or pinching the seal during component assembly
6. Check for leaks after the system reaches operating pressure and temperature

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Request a Quote

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