The Wacker Neuson Flexshaft Core Sm4S is a genuine OEM component designed for the M1000, M2000, M3000, A1500, A5000, L5000, and D4000 series electrical, gasoline, diesel, and battery-powered internal vibrator power units. As a direct Wacker Neuson OEM part, the is manufactured to the exact specification required for these drive systems, ensuring the flex shaft assembly performs as intended across the full range of compatible power units. This part fits an extensive lineup of M-series and A-series power units spanning 120V, 230V, UL, and non-CUL configurations, as well as ISO and ANSI variants.
Key Features
- Genuine OEM Transmission Core: — Manufactured to Wacker Neuson's exact torque-transfer specifications, so the inner core delivers consistent rotational drive to the vibrator head without slack or torsional play.
- Drop-In Compatibility: — Engineered to seat correctly within the Sm4S flex shaft housing used across M1000, M2000, M3000, A1500, A5000, L5000, and D4000 power units — no trimming or adaptation needed.
- Broad Power Unit Coverage: — Fits electric (120V/230V, UL/non-CUL/RFI), gasoline, diesel, and battery-powered internal vibrator drive units, covering both ISO and ANSI configurations.
- Sustained Vibration Output: — A worn or broken flex shaft core causes the vibrator head to lose speed or stop spinning entirely; replacing it with part 5000078334 restores full vibration frequency to the poker head.
- Operational Safety in Concrete Work: — A correctly functioning flex shaft core prevents sudden loss of vibration during a pour, which can result in poorly consolidated concrete and structural voids — a critical compliance concern on reinforced pours.
The flex shaft core is the inner drive element that transmits rotational energy from the power unit motor down through the flexible conduit to the vibrator poker head. It spins at high RPM inside the outer casing, converting the motor's output into the eccentric vibration needed to consolidate fresh concrete and eliminate air pockets. When the core wears, kinks, or fractures, the poker head loses vibration amplitude or stops entirely — leaving concrete under-vibrated and potentially compromising the structural integrity of the pour. Replacing the core restores full energy transfer and gets the vibrator back to rated performance.
Part Details
| Part Number | 5000078334 |
|---|---|
| Old Part Number | 0078334 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Flexshaft Core Sm4S |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Electrical Power Unit for Inte rnal Vibrator | M3000/230 | 5000005800 |
| Electrical Power Unit | M2000/120 | 5000007653 |
| Electrical Power Unit for Inte rnal Vibrator | M1000/230 | 5000005041 |
| Electrical Power Unit for Inte rnal Vibrator | M1000/120/nonCUL | 5000005843 |
| Electrical Power Unit for Inte rnal Vibrator | M3000/120/nonCUL | 5000005845 |
| Electrical Power Unit for Inte rnal Vibrator | M2000/115/15A | 5000006305 |
| Electrical Power Unit | M2000/120/nonCUL | 5000007159 |
| Electrical Power Unit for Inte rnal Vibrator | M1000/230/RFI | 5000005494 |
| Electrical Power Unit for Inte rnal Vibrator | M2000/230/RFI | 5000005495 |
| Electrical Power Unit for Inte rnal Vibrator | M2000/230/n Gr | 5000006551 |
| M3000/230/RFI | M3000/230/RFI | 5000006590 |
| Diesel Power Unit for Internal Vibrator | D4000 | 5000009091 |
| A5000/160 ISO | A5000/160 ISO | 5000610325 |
| A5000/160 ANSI | A5000/160 ANSI | 5000610340 |
| Gasoline Power Unit for Intern al Vibrator | A5000 | 5000009213 |
| L5000/225 ISO | L5000/225 ISO | 5000610329 |
| A1500-POWER UNIT,HONDA,35CC | A1500/035 ISO | 5000610324 |
| A1500 POWER UNIT, HONDA | A1500/035 ANSI | 5000610339 |
| L5000/225 ANSI | L5000/225 ANSI | 5000610341 |
| Drive Engine | M1000/120/UL | 5100006158 |
| Drive Engine | M2000/120/UL | 5100006159 |
| Drive Engine | M3000/120/UL | 5100006160 |
| A5000/160B | A5000/160B | 5100068212 |
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.
