The Multiquip 12211 Bearing Set OS 0.75 is a genuine OEM component designed for Mayco C30HDNI and C30HDN series concrete pumps, including C30HDNI Precision and C30HDNI Zenith variants. As a direct OEM replacement, this oversized bearing set is sourced to the same specifications as the original, ensuring a proper service fit during engine or crankshaft reconditioning work. Confirm your model code against the fitment list — C30HDNI, C30HDN, C30HDNI Precision, and C30HDNI Zenith are all covered by this part number.
Key Features
- Genuine OEM Bearing Precision — Manufactured to exact oversized tolerances, ensuring correct bearing clearance and crankshaft seating during rebuild service on Mayco concrete pump engines.
- Oversized 0.75mm Service Spec — The OS 0.75 designation identifies this set as the correct oversize grade for use when journals have been machined to the 0.75mm undersize specification — not interchangeable with standard or other OS grades.
- Broad Mayco Pump Fitment — Compatible across C30HDN, C30HDNI, C30HDNI Precision, and C30HDNI Zenith models, covering multiple engine configurations in the Mayco C30 concrete pump family.
- Supports Full Engine Rebuild Integrity — Worn or out-of-spec bearings in a concrete pump engine cause rapid crankshaft wear, oil pressure loss, and eventual seizure; using the correct OS grade restores proper operating clearances and extends engine service life.
- Genuine Multiquip OEM Part — Supplied under Multiquip part number 12211, backed by the manufacturer and sold by an authorized distributor for complete sourcing confidence.
Bearing sets in an engine serve as the precision interface between the rotating crankshaft and the engine block, maintaining the oil film that prevents metal-to-metal contact under load. In concrete pump applications — where engines run hard under sustained hydraulic demand — worn or incorrect bearings lead to dropped oil pressure, audible knock, and accelerated crankshaft damage. An oversized bearing set like the 12211 is used specifically during engine reconditioning, when journals have been reground to accept a larger bearing shell, restoring the correct running clearance and allowing the engine to return to full working condition.
Part Details
| Part Number | 12211 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Bearing Set OS 0.75 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HDNI |
| Mayco Pumps | C30HDN |
| Mayco Pumps | C30HDNI Precision |
| Mayco Pumps | C30HDNI Zenith |
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.
