The Wacker Neuson Square Key is a genuine OEM component designed for a broad range of Wacker Neuson diaphragm trash pumps, ride-on concrete trowels, and vibratory truss screeds. This small but critical drive component is sourced directly from Wacker Neuson, ensuring it matches the exact dimensions of the original keyway slot in each compatible machine. Confirmed fitment spans the PDT2, PDT2A, PDT2B, PDT3, PDT3A, PDI2, PDI2A, PDI3, and PDI3A diaphragm pump series, as well as the CRT36ASO, CRT36ASN, and CRT46ASO ride-on trowel models and SP50 and SP75 vibratory truss screed power sections.
Key Features
- Exact OEM Dimensions — Machined to the precise cross-section required by the keyway groove, ensuring full torque transfer without slop or rocking.
- Genuine Wacker Neuson Part — Sourced directly from Wacker Neuson; part number 5000087918 matches the original specification across every listed machine family.
- Wide Cross-Family Fitment — Covers 2-inch and 3-inch PDT and PDI diaphragm trash pumps, CRT36 and CRT46 ride-on trowels, and SP50/SP75 vibratory truss screed power sections in a single part number.
- Positive Shaft-to-Hub Engagement — A correctly fitted square key locks rotating components to the drive shaft, maintaining synchronized operation and preventing slippage under load.
- Drive-System Safety — A worn or undersized key allows shaft slippage that can damage keyways, leading to costly shaft or hub replacement; using the correct OEM key prevents accelerating that damage.
A square key is a small, precisely dimensioned steel insert that sits in matching slots cut into both a drive shaft and the hub of a rotating component — such as a pump impeller, engine clutch hub, or screed drive pulley. It creates a positive mechanical lock between the two parts, transmitting rotational torque without relying on friction or fastener clamping force alone. When a square key wears, shears, or goes missing, the shaft spins freely inside the hub, the driven component stops turning, and continued operation rapidly widens the keyway slot — turning a low-cost fix into an expensive shaft or housing repair.
Part Details
| Part Number | 5000087918 |
|---|---|
| Old Part Number | 0087918 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Square Key |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 50mm/2in Diaphragm Trash Pump | PDT2A | 5000007610, 5000007611 |
| 75mm/3in Diaphragm Trash Pump | PDT3A | 5000007614, 5000007615, 5000007616 |
| 50mm/2in Inline Diaphragm Tras h Pump | PDI2A | 5000007624, 5000007625 |
| 75mm/3in Inline Diaphragm Tras h Pump | PDI3A | 5000007628, 5000007629, 5000009407 |
| 50mm/2in Diaphragm Trash Pump | PDT2 | 5000009494, 5000007633 |
| 75mm/3in Diaphragm Trash Pumps | PDT3 | 5000009495, 5000007619 |
| 915mm/36in Ride-On Trowel, ove rlapping | CRT36ASO | 5000007512 |
| 915mm/36in Ride-On Trowel, non #NAME? | CRT36ASN | 5000007513 |
| CRT46ASO | CRT46ASO | 5000007514 |
| 50mm/2in Diaphragm Trash Pump | PDI2 | 5000009489 |
| 50mm/2in Diaphragm Trash Pump | PDT2B | 5000007612, 5000007613 |
| Vibratory Truss Screed, Power Section | SP75 | 5000008295 |
| Vibratory Truss Screed, Power Section | SP50 | 5000008296 |
| 75mm/3in Diaphragm Trash Pump | PDI3 | 5000009491, 5000009492 |
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.
