MBW WS500 - Manual (Page 13)

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Parts Replacement Cycles and Tolerances
Bearings
Replace anytime a bearing is rough, binding, discolored or removed from housing or
shaft.
Engine Components Refer to your engine manufacturer’s Owner’s Manual.
Hardware
Replace any worn or damaged hardware as needed. Replacement hardware should
be grade 5 and zinc plated unless otherwise specified.
Safety Decals Replace if they become damaged or illegible.
Seals, O-rings, & Gaskets Replace if a leak is detected and at every overhaul or teardown.