Komatsu Part HOSE 421-09-45111

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Product Overview

The 421-09-45111 HOSE is a genuine Komatsu OEM replacement hose from the 421 prefix series. Hoses carry pressurized hydraulic oil, fuel, coolant, and lubricant between components in your machine's fluid systems — they're the flexible conduits that accommodate component movement while withstanding working pressure, heat, and environmental exposure.

Part Number: 421-09-45111 Part Name: HOSE Part Type: OEM Komatsu Replacement Hose Availability: In stock — ready to ship

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When to Replace

Replace the 421-09-45111 when the outer cover shows cracking, bulging, or abrasion exposing the reinforcement; when leaks appear at fitting ends or through the hose wall; when soft, spongy, or blistered areas indicate internal failure; when kinked, crushed, or cut sections are present; or when Komatsu's replacement interval has been reached. Regular hose inspection during preventive maintenance prevents unexpected failures.

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Installation

1. Confirm 421-09-45111 in your Komatsu catalog
2. Route without sharp bends — observe minimum bend radius
3. Allow slack for movement and thermal expansion
4. Tighten fittings to torque
5. Pressure test through full operating cycles

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Request a Quote

Need the Komatsu 421-09-45111 HOSE? Contact us through the form, or by phone, email, or WhatsApp. We respond within one business day.