The Multiquip EM968481 is a genuine OEM Castle Nut designed for the C30HD series Mayco concrete pumps, including the C30HD, C30HDNI, C30HDNI Precision, C30HDN, C30HDNI Zenith, C30HDG, C30HDZ, and C30HDGA. As a factory-sourced component, it meets the exact material and dimensional standards set by Multiquip for these cycloidal-driven concrete pump models. Sourced directly through an authorized Multiquip distributor, DHS Equipment supplies this part to keep your pump running to specification. Verify your model code before ordering to confirm this nut matches your unit's fastener requirements.
Key Features
- Genuine OEM Material Grade — Manufactured to the exact hardness and thread specification required for concrete pump fastening applications, where vibration and load cycles demand consistent clamping force.
- Slotted Crown for Cotter Pin Retention — The castle profile accepts a cotter pin or safety wire to lock the nut in position, preventing loosening under the continuous vibration of pump operation.
- Direct Fitment Across the C30HD Series — Confirmed for C30HD, C30HDNI, C30HDNI Precision, C30HDN, C30HDNI Zenith, C30HDG, C30HDZ, and C30HDGA Mayco concrete pump models.
- Maintains Pump Structural Integrity — A correctly torqued and locked castle nut keeps critical assemblies secured; a missing, worn, or incorrect nut can allow components to shift under pump pressure and vibration.
- Safety-Critical Fastener — On concrete pump equipment, fastener integrity is essential for operator safety and continuous output pressure; using the correct OEM nut ensures the locking mechanism functions as engineered.
A castle nut — named for its slotted, crown-like top — is a specialized fastener used where a standard nut would be at risk of vibrating loose over time. The slots in the crown allow a cotter pin or safety wire to pass through a drilled hole in the bolt or shaft, mechanically locking the nut in place regardless of vibration or cyclic loading. On a concrete pump like the C30HD series, where hydraulic pressure, mechanical reciprocation, and on-site vibration are constant, this type of positive locking fastener is essential for keeping assemblies secured. A missing or damaged castle nut can allow connected components to shift, leading to misalignment, accelerated wear, or unsafe operating conditions.
Part Details
| Part Number | EM968481 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Castle Nut |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HD |
| Mayco Pumps | C30HDNI |
| Mayco Pumps | C30HDNI Precision |
| Mayco Pumps | C30HDN |
| Mayco Pumps | C30HDNI Zenith |
| Mayco Pumps | C30HDG |
| Mayco Pumps | C30HDZ |
| Mayco Pumps | C30HDGA |
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.
