Finding the Right Parts for Your Craftsman FS5500
The Craftsman FS5500 is a 5-gallon wet/dry vacuum that's been around long enough to have a scattered parts ecosystem. You're probably here because something broke and the replacement part isn't as simple as ordering it. I've had two of these over the years, and once you understand how the parts diagram works, most failures become cheap fixes instead of replacement-buying situations. The most reliable source is the Craftsman / Sears parts lookup. Go to searspartsdirect.com or craftsmantools.com/parts and search "FS5500". You'll get an exploded-view diagram with every numbered part and its corresponding SKU. The diagram breaks the vacuum into roughly six sub-assemblies: the motor/switch section, the float valve assembly, the tank and base, the hose/wand connections, the filter system, and the wheels/caster hardware. I usually pull up the diagram first before opening anything. It tells you exactly which screws hold what together and, more importantly, which parts are sold as kits versus individual components. The filter assembly alone is a nightmare if you don't already know it's sold as a single kit rather than separate foam and pleated paper elements.
How to Read the Diagram and Order Correctly
Here's the part nobody explains well. The exploded diagram numbers don't always map 1-to-1 to what you can actually buy. Craftsman sometimes lists sub-assemblies (like "float valve kit #9786") and other times sells individual O-rings or clips. Before you call anyone, check whether the part number you found is a single component or a repair kit. The kit versions are almost always cheaper and come with the new O-rings that fail first anyway. My go-to workflow is to photograph the actual vacuum next to the diagram on my phone, circle the part numbers I need, then cross-reference them in the Sears parts catalog. This avoids the classic mistake of ordering a housing when you actually just need the gasket inside it. One practical detail that saved me hours: the diagram labels the ON/OFF switch assembly as a single unit, but the switch itself is a separate micro-switch that clips into the handle. If your trigger feels loose or intermittent, you might not need a whole new switch assembly. The individual micro-switch part is significantly cheaper. I learned this the hard way after ordering the full assembly and realizing the housing was fine and only the tiny switch contacts had worn out.
Common Failure Points and What the Diagram Reveals
Based on real use, these are the parts that actually fail and what the diagram shows you about each: Float valve assembly — This is the most common failure. When the float gets stuck, water stays in the tank instead of draining. The diagram shows the float is a simple buoy on a hinge pin. In practice, mineral buildup is the usual culprit. I've cleaned these with white vinegar soaks before replacing them. If the hinge pin is bent or the float is cracked, you need the full kit. Part numbers typically start with 9786 or 9787 depending on your manufacturing date. Motor brush assemblies — These drawables wear out. The diagram shows two brushes with retaining springs. If your vacuum loses power or sparks, check these before assuming the motor is shot. Brushes on this model run about 100 to 150 hours before replacement. I track this by noting the date on the back of the brush packaging when I install them.
Get the Full Details
Hose coupling gaskets — The diagram shows a small rubber gasket between the hose and the inlet port. This is the part that cracks and causes suction loss at the worst possible time. It's a $3 part that most people miss because the diagram buries it between the hose collar numbers. Grab two when you order anything else. Filter element retention clip — A small metal clip that holds the filter in place. The diagram shows it as part of the filter housing assembly, but it sells separately. When this pops off, the filter flops around and dust goes straight through. I've seen this cause more premature motor failures than any other single issue on this model.
What the Diagram Doesn't Tell You
The exploded view is helpful but incomplete in ways that matter. It doesn't show you torque specifications for the tank bolts, and it doesn't indicate which fasteners are thread-locker'd versus plain. The base-to-tank bolts on the FS5500 are notoriously stubborn because Craftsman applies a moderate thread locker at the factory. I use a heat gun on the bolt heads for about 20 seconds before attempting removal. Direct wrench force alone will strip the heads every time on a vacuum that's seen more than two years of service. Another gap: the diagram treats the electrical components as modular, but the wiring harness on these units shares connectors across multiple assemblies. If you're replacing the switch, you need to note which wire goes where before you disconnect anything. A quick phone photo of the harness connection takes 10 seconds and prevents an hour of tracing wires later. I don't recommend working blind on the electrical side. The biggest frustration with the FS5500 parts diagram is that Craftsman changed the internal design mid-production. Units made before approximately 2018 have a different float valve configuration than later models. The diagram listing won't always flag this difference. If your part number doesn't match the diagram, check the manufacturing date stamp on the tank bottom. It's usually a code like "WK18" meaning week 18 of some year. This matters most for the float valve and the motor mounting brackets.
Ordering Strategy That Actually Works
Order the full repair kit for any subsystem you're touching rather than individual parts. The kits include the O-rings and gaskets that degrade along with the main component, and they cost less than buying everything separately. Check the return policy too — some third-party sellers on the Craftsman parts site don't accept returns on opened kits, which is worth knowing before you buy five different single parts and realize you missed one small clip. If the diagram shows a part as obsolete or unavailable, the workable alternative is often to order from a third-party separator like PartSelect or RepairClinic. They sometimes list older part numbers that Sears has dropped from their active inventory. I've found replacement caster wheels and the upper handle assembly this way when Craftsman's own listing showed "no longer available." The tank itself rarely fails structurally, but if it does crack, replacement is usually more practical than repair. The diagram treats the tank as a single part number, which means you're ordering the entire vessel. Expect this to be the most expensive single component in the bill of materials, and factor that into your decision to replace versus buy a new vacuum.
