The Multiquip EM26525 is a genuine OEM Cylinder Box O-Ring designed for the C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDG, C30HDGA, C30HDZ, and C30HDN cycloidal-drive concrete pumps. As a direct factory replacement, EM26525 seals the cylinder box assembly to specification, ensuring fluid-tight integrity throughout the pumping cycle. This part is sourced directly through Multiquip's authorized supply chain, so you can be confident it meets the exact material and dimensional standards of the original component.
Key Features
- OEM-Grade Seal Material — Manufactured to the precise durometer and compound specification required for the cylinder box environment, maintaining a consistent, leak-free seal under operating pressure.
- Drop-In Cylinder Box Fit — Dimensioned to seat directly into the cylinder box groove on C30HD-series concrete pumps without trimming or modification to the bore or channel.
- Broad C30HD-Series Coverage — Confirmed fitment across C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDG, C30HDGA, C30HDZ, and C30HDN models.
- Sustains Pumping Pressure — A properly seated cylinder box O-ring holds hydraulic and material pressure within the pump circuit; a degraded seal causes pressure loss, output inconsistency, and accelerated wear on surrounding components.
- Fluid Containment Compliance — In concrete pump applications, a failed cylinder box seal can allow grout or hydraulic fluid migration — replacing with a correct-spec OEM part maintains proper containment and protects downstream components.
The cylinder box O-ring forms a critical pressure seal at the junction of the cylinder box on a cycloidal-drive concrete pump. Its job is to prevent hydraulic fluid or pumped material from bypassing the sealed chamber during the compression and discharge strokes. When this O-ring deteriorates — through compression set, chemical degradation, or abrasion from pumped material — the pump loses output pressure, stroke efficiency drops, and material flow becomes erratic. Replacing a worn O-ring promptly keeps the pump operating at full capacity and prevents more extensive damage to the cylinder and valve components.
Part Details
| Part Number | EM26525 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Cylinder Box O-Ring |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HDNI |
| Mayco Pumps | C30HDNI Precision |
| Mayco Pumps | C30HDG |
| Mayco Pumps | C30HDZ |
| Mayco Pumps | C30HDN |
| Mayco Pumps | C30HDNI Zenith |
| 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.
