KOMATSU 07000-12105 O-RING

The Komatsu 07000-12105 O-Ring is a factory-spec sealing ring made to keep hydraulic circuits airtight and leak-free across a wide range of Komatsu dozers. It sits inside pumps, cylinders, and valve housings, holding pressure steady and keeping contaminants like dust and moisture out of sensitive hydraulic passages. Small as it is, a worn or damaged version of this seal can quietly drain hydraulic efficiency long before a bigger failure shows up.

This O-Ring is molded from NBR-1B nitrile rubber, chosen specifically for its resilience against hydraulic oil, grease, and the kind of pressure cycling heavy machinery puts seals through daily. It’s rated for a temperature range of -30°C to 100°C, so it holds its shape and sealing force whether the equipment is running in a frozen job site or under sustained heat load. Made to an outer diameter of roughly 104.4mm with a 3.1mm cross-section width, and finished to a hardness of JIS HS 88 ± 5, it’s built for a snug, consistent fit rather than a loose approximation.

Swapping in a genuine Komatsu O-Ring instead of a generic substitute protects the components around it — hydraulic pumps and cylinders are expensive to rebuild, and a failed seal is often the root cause. Scheduled replacement of this part is a low-cost way to avoid pressure loss, oil seepage, and unplanned downtime on machines that are expected to run for years.

Technical Features

• Genuine Komatsu-spec O-Ring
• NBR-1B nitrile rubber construction
• Outer diameter approx. 104.4mm, width 3.1mm
• Hardness: JIS HS 88 ± 5
• Operating temperature range: -30°C to 100°C
• Resists hydraulic oil, grease, and pressure cycling
• Precision-molded for a consistent, reliable fit

Compatible Machine Models

Komatsu Dozer

• D155A-2A, D155A-6
• D155AX-6, D155AX-6A
• D65A-6, D65A-8
• D65E-6, D65E-8, D65E-12

Alternative Part Numbers

• 07001-01009
• 23B-22-11380
• 07000-13032

Shop & Supply stocks the Komatsu 07000-12105 O-Ring for immediate dispatch, alongside a full range of genuine Komatsu seals for dozers and excavators. Sourcing the original part means you’re getting the exact dimensions, hardness, and material grade the machine was engineered for — no guesswork, no premature failures, just consistent sealing performance where it matters.