The Wacker Neuson Parallel Key is a genuine OEM component designed for WPU1550A, WPU1550AW, and MPU 29 series reversible plate compactors. Sourced directly from Wacker Neuson, this part meets the exact specifications of the original, ensuring a correct drop-in installation with no guesswork. Compatibility spans the full WPU1550A and MPU 29 model range, including US-market variants such as the WPU1550A-US and WPU1550AW-US.
Key Features
- Exact OEM Dimensioning — Machined to the precise tolerances required for positive shaft-to-hub engagement, maintaining the torque transfer integrity Wacker Neuson specifies for this drivetrain.
- Direct Slot-In Replacement — Matches the original keyway profile on both shaft and hub, seating correctly without filing or fitting adjustments.
- Broad Model Coverage — Fits the WPU1550A, WPU1550AW, WPU1550A-US, WPU1550AW-US, and MPU 29 series reversible plate compactors across multiple production runs and serial ranges.
- Torque Transmission Integrity — A correctly seated parallel key locks the rotating assembly in proper alignment; a worn or missing key causes slippage, vibration, and accelerated wear to both shaft and hub.
- Genuine Wacker Neuson Part — Supplied as an authentic OEM component under part number 5000400318, so you are getting the same part that left the factory originally.
A parallel key is a small but critical drivetrain component that locks a rotating shaft to a mating hub or gear, preventing the two from spinning independently of each other. It sits in matching keyway slots cut into both the shaft and the hub, transmitting torque reliably between them during machine operation. When a parallel key shears, cracks, or wears down, the shaft and hub lose their positive connection — causing slippage, loss of drive power, and rapid damage to the surrounding components if not addressed promptly.
Part Details
| Part Number | 5000400318 |
|---|---|
| Old Part Number | 0400318 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Parallel Key |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| WPU1550A | WPU1550A | 5000630033, 5100071592 |
| WPU1550Aw | WPU1550Aw | 5000630034 |
| Reversible Plates | WPU 1550A-L | 5000630124 |
| Reversible Plates | MPU 29 | 5000630141, 5000630228 |
| WPU1550AW-US | WPU1550AW-US | 5100069715 |
| WPU1550Aw | WPU1550AW | 5100071591 |
| Reversible Plates | MPU 29A | 5000630244 |
| WPU1550A-US | WPU1550A-US | 5100069716 |
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.
