| Diagram | Fig. 23 — Rear Wheel (Disc Type) · ref 21 |
| Subsystem | wheels |
| Listed in parts books | 1975 |
Norton Seal, Oil
An oil seal for the disc-type rear wheel hub, part number 06-5557.
This is an oil seal for the rear wheel on the disc-type rear end, carried in the catalog under part number 06-5557. The catalog record shows it appearing in the Rear Wheel (Disc Type) figure, so it's a wheel hub seal rather than an engine or gearbox seal.
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Oil seals like this one keep grease or oil in the hub bearing area from working its way out onto the brake disc or drum, and keep water and grit from working its way in. On a disc-type rear wheel setup that's important, since a contaminated disc or pad kills braking performance fast.
Our record for this one only shows the single catalog appearance in 1975, so we don't have a spread of model years to point to. If you're matching this against a parts book, check the seal against your actual hub before ordering, since wheel seals vary by hub design even within the same era.
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