714-07-17941 7140717941 GASKET,UPPER VALVE, Transmission Control Valve Gasket,WA420-3 WA470-3

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5. FAQ
Q: Hey, I noticed the gaskets in this lower valve assembly diagram. Do you know what materials they’re usually made of?
A:  Sure! These are typical hydraulic/transmission valve body gaskets, so the most common materials are non-asbestos fiber composites, rubber-coated steel, and sometimes cork-rubber blends or paper-based materials depending on the application.

Q: Alright, start with the basics. What’s the go-to material here?

A: First up is compressed non-asbestos fiber gasket material, often called “sheet gasket.” It’s made from aramid fibers, mineral fillers, and a nitrile rubber (NBR) binder. Most of the standard gaskets here, like 26 and 28, use this.

Q: And what about extreme conditions? If this valve runs really hot?

A: Then you’d see fluorocarbon rubber (FKM/Viton) or fluoroelastomer-coated gaskets. These resist degradation from high-temperature ATF and synthetic oils way better than standard NBR. They’re common in heavy-duty or high-performance transmissions, where operating temps can push past 130°C.

Q: How to determine whether the Komatsu transmission gasket set needs a full replacement?

Below are practical judgment standards from professional maintenance technicians, easy to understand, and no full disassembly is required.
External visible symptoms (judge without disassembly)

• Oil seepage or oil leakage at the joints of the transmission housing; oil stains, oil sludge accumulation or oil dripping appearing at housing seams, end covers, transmission pump mounting surfaces, and valve cover edges → full gasket set replacement is required.
• If there are transmission oil drops on the ground after parking, and oil seal leakage is ruled out, it is basically caused by aging and failure of the paper gaskets.
• The transmission oil level keeps dropping regularly with no damaged oil pipes found; this is mostly slight seepage from worn paper gaskets. The leak may not be obvious to the naked eye but causes continuous oil consumption.

6. Exhibition and Wearhous

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