KOMATSU 07000-11008 O-RING

The Komatsu 07000-11008 O-Ring is a factory-engineered seal designed to keep hydraulic systems tight and leak-free across a wide range of Komatsu heavy equipment, from bulldozers to motor graders to compact excavators. Fitted inside pumps, cylinders, and valve assemblies, it stops hydraulic fluid from escaping and blocks dirt and moisture from working their way into the system — a simple job, but one that directly affects how consistently a machine holds pressure under load.

Produced to Komatsu’s exact factory tolerances, this O-Ring uses a durable elastomer compound formulated to stand up to hydraulic oil, grease, constant pressure cycling, and the friction that comes with repeated cylinder movement. It’s built to flex without losing its shape, so it keeps sealing properly even after long stretches of vibration and heavy operating cycles. The precision molding behind it means installation goes smoothly and the seal performs the same way today as it will years down the line.

Because this part sits inside some of the most expensive components on the machine — hydraulic pumps, cylinders, and valve bodies — using a genuine seal rather than a loosely-matched substitute is one of the cheapest ways to avoid a much costlier repair later. Replacing it proactively during scheduled maintenance helps keep pressure stable, reduces oil consumption from slow leaks, and protects the surrounding hydraulic assembly from premature wear.

Technical Features

• Genuine Komatsu-spec sealing ring
• High-performance elastomer compound
• Strong resistance to hydraulic oils, greases, and pressure fluctuations
• Withstands vibration, friction, and temperature swings
• Precision-manufactured to factory tolerances for a reliable fit
• Supports consistent hydraulic pressure and system efficiency
• Suitable across dozer, grader, and excavator hydraulic circuits

Compatible Machine Models

Komatsu Bulldozer

• D155A-6
• D155AX-5
• D155AX-6

Komatsu Motor Grader

• GD555-3C
• GD655-3A

Komatsu Excavator

• PC09-1-W
• PC09-1A
• PC09-1B
• PC100-2
• PC100-3-T

Alternative Part Numbers

• 07001-01009
• 07000-12105
• 23B-22-11380

Shop & Supply carries the Komatsu 07000-11008 O-Ring in stock and ready to ship, as part of a full lineup of genuine Komatsu seals for dozers, graders, and excavators. Choosing the original part means the fit, material grade, and pressure tolerance match exactly what your machine was built for — no compromises, no early failures, just dependable sealing performance job after job.