The Wacker Neuson Flywheel Complete is a genuine OEM component designed for a broad range of Wacker Neuson walk-behind concrete trowels, floor saws, portable generators, trash pumps, and reversible vibratory plate compactors — including the CT36 and CT48 trowel series, BFS940 and BFS914 floor saws, GP3800 and GV5000A generators, PT3A trash pumps, and BPU 3050A, BPU 3750Ats, and BPU 4045A plate compactors. Sourced directly from Wacker Neuson, part number carries the same fit, form, and function specifications as the component installed at the factory. This flywheel assembly spans an exceptionally wide fitment range, making it a practical stocking part for dealers, rental fleets, and service technicians who maintain multiple Wacker Neuson machine types. Confirm your machine's model and serial number against the fitment list before ordering to ensure correct application.
Key Features
- Genuine OEM Rotational Mass: — Manufactured to Wacker Neuson's original inertia and balance specifications, ensuring smooth engine cranking and consistent power delivery across every compatible machine type.
- Direct Drop-In Replacement: — Matches the original mounting bolt pattern, taper, and keyway of the engines used across the CT36, CT48, BFS, GP, GV, PT, and BPU model families for a straightforward swap without machining or adaptation.
- Wide Cross-Family Fitment: — A single part number covering walk-behind trowels (CT36AGP, CT36AGT, CT48ADP, CT48ADT and variable-speed variants), BFS floor saws, GP3800/GV5000A/GV5003A generators, PT3A trash pumps, BPU/MPU reversible plates, and HPG screed power units.
- Consistent Engine Start Performance: — A flywheel in correct condition stabilizes the recoil or electric start sequence and maintains idle smoothness; a cracked, damaged, or out-of-balance flywheel causes hard starting, rough idle, and can accelerate wear on the crankshaft seal and starter assembly.
- Ignition Timing Integrity: — The flywheel carries the magneto magnets that trigger the ignition module; using the correct OEM flywheel preserves the precise timing relationship required for clean ignition and proper engine output.
The flywheel is a heavy rotating disc bolted directly to the engine crankshaft. Its mass stores rotational energy between power strokes, smoothing out engine operation and making hand-pull or electric starting possible by giving the starter mechanism something solid to engage. On small air-cooled engines, the flywheel also carries cooling fins that direct airflow across the cylinder head, as well as the permanent magnets that generate the ignition spark through the magneto coil. When a flywheel is cracked, has a damaged keyway, or loses a magnet, the result is typically a no-start condition, erratic ignition timing, engine overheating, or severe vibration — all of which halt production until the part is replaced.
Part Details
| Part Number | 5100000432 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Flywheel Complete |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| BFS940 | BFS940 | 5100029229, 5100054574 |
| CT36-8A-V | CT36-8A-V | 5000620832, 5000009442 |
| CT36-8A Trowel | CT36-8A | 5000009439, 5000620831 |
| CT48-8A Trowel | CT48-8A | 5000009449 |
| CT48-8A | CT48-8A EU | 5000620837 |
| GV5000A | GV5000A | 5000009346, 5000009351, 5000009361, 5100006204 |
| 50Hz Portable Value Generator | GV5003A | 5000009347, 5000009362, 5100002154 |
| 915mm/36in CE Walk-behind Trow el | CT36AGP | 5000007596, 5000007595 |
| 915mm/36in CE Walk-behind Trow el | CT36AGP-E | 5000008036, 5000008026 |
| 1220mm/48in Walk-behind Trowel | CT48ADP | 5000007598, 5000007599, 5000008199 |
| 1220mm/48in CE Walk-behind Tro wel | CT48ADP-E | 5000008027, 5000008028 |
| 915mm/36in CE Walk-behind Trow el | CT36AGT-E | 5000007594, 5000008012 |
| 1220mm/48in CE Walk-behind Tro wel | CT48ADT-E | 5000007597, 5000008016 |
| 915mm/36in CE Walk-behind Trow el | CT36AGT | 5000008014, 5000008011 |
| 1220mm/48in Walk-behind Trowel | CT48ADT | 5000008015, 5000008040 |
| GP3800A Generator, EPA w/Wheel Kit | GP3800 | 5000620976, 5000620974, 5000620975, 5100031174 |
| BPU 3050A | BPU 3050A | 5000008763 |
| 915mm/36in Variable Speed Walk #NAME? | CT36AVP | 5000009235, 5000009236 |
| HPG100A | HPG100A | 5000009507 |
| BPU 3050A US | BPU 3050A US | 5000610361 |
| 75mm/3in Centrifugal Trash Pum p | PT3A | 5000006729, 5000006730, 5100058535, 5100058536, 5100042216 |
| BFS 935A SAW,BASIC | BFS 935AB | 5000008910 |
| 915mm/36in Variable Speed Walk #NAME? | CT36AVT | 5000009233, 5000009234 |
| Single Direction Vibratory Pla te, 25kN, 50cm/20in | BPS 2550A | 5000007528 |
| HPG50A | HPG50A | 5000009509 |
| BPU 3750Ats | BPU 3750Ats | 5000610408 |
| BPU3750Ats | BPU 3750Ats US | 5000610423 |
| Gasoline Reversible Vibratory Plate | BPU 3050 | 5000008955 |
| BFS 914AB SAW | BFS 914AB | 5000610092 |
| BPU 4045A US | BPU 4045A US | 5100009663, 5000610403 |
| Petrol Floor Saw BFS 940A | BFS 940A | 5000610327, 5100004004 |
| Reversible Plates | MPU 29A | 5000630244 |
| Vibratory plate BPU 4045A | BPU 4045A | 5000610345 |
| Value Portable Generator | GV3800 | 5000620994 |
| Vibratory Truss Screed, Power Section | HPG100 | 5000008293 |
| Vibratory Truss Screed, Power Section | HPG50 | 5000008294 |
| Floor Saw | BFS 914A | 5100004002 |
| Floor saw BFS940 | BFS 940 | 5100009934 |
| Vibration Plate | BPU3050A CN | 5100039661 |
| GP3800A | GP3800A | 5100041978 |
| PT3A(I) | PT3A(I) | 5100042614 |
| BT48A | BT48A | 5100081471 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
