17A-13-42710 17A1342710 SEAL RING OF POWER TRAIN PUMP and TURBINE D155AX-8 D155AX-6

1. Quick Details of  seal 17A-13-42710:

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3.17A-13-42710  picture:

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5. FAQ

Q: How to distinguish the front and back of these seal ring?

A:  Inner Diameter (ID) Bevel vs. Flat BackOn many Komatsu Teflon rings of this generation, the inside circumference dictates the direction:The Front (Facing the incoming oil): The inside corner will often have a small machined bevel or chamfer (an angled cut) to help smoothly guide the oil or slide over the piston during assembly.The Back: The back inside edge will form a sharp, distinct 90 degree angle so it locks tight into the corner of the piston groove and won't slip.Visual MarkingsExamine both flat faces of the ring under good lighting:The Front/Outside Facing: OEM Komatsu rings or high-end aftermarket equivalents like Blumaq often stamp or print tiny part numbers, brand logos, or a small dot/marker on one side.Rule of thumb: If you see any printed text, a stamped number, or a colored paint dot, that face almost always points outward/forward (toward the direction you are installing it from, or facing the hydraulic fluid pressure).

Q: What common mistakes lead to early gasket failure?

A: The most frequent issues are dirty or scratched mating surfaces, uneven bolt torque causing warping, using the wrong gasket thickness for the flange gap, and reusing a previously compressed gasket.

Q: How long can a properly installed PTFE gasket last?

A: With clean surfaces and correct torque, it can last for years of continuous service. It only needs replacement when the joint is disassembled for maintenance or repair.

Q: What makes PTFE ideal for hydraulic applications?

A: PTFE resists nearly all hydraulic fluids, acids, and bases, works reliably from -200°C to +260°C, and won’t degrade or swell over time, so the seal stays consistent even with long service life.

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