The Multiquip 1042616 Upper Ball Bearing #6306ZZC3 is a genuine OEM component designed for the ST4125D and ST6125D clean water submersible pumps. As a direct OEM replacement, this bearing is manufactured to the same specifications as the original, ensuring proper fit within the pump's motor shaft assembly. Verified for use on ST4125D and ST6125D series submersible pumps, this part ships as an exact match to what came installed at the factory. Keep a spare on hand to minimize unplanned service interruptions on critical dewatering applications.
Key Features
- OEM-Grade Bearing Tolerancing — Manufactured to the original #6306ZZC3 specification, including proper internal clearance (C3 rating) and dual-shield construction to resist contamination and maintain consistent radial load capacity.
- Upper Position Specific — Engineered for the upper bearing seat on the motor shaft, ensuring correct axial positioning and shaft alignment without adaptation or modification to the housing.
- Confirmed Fitment for ST4125D and ST6125D — Verified OEM replacement for Multiquip ST4125D and ST6125D clean water submersible pump models.
- Protects Motor Shaft Integrity — A correctly functioning upper bearing maintains shaft concentricity, reducing vibration and preventing premature wear to the motor windings, impeller, and seal faces above and below it.
- Dual-Shield Design — The ZZ (dual metal shield) construction keeps grease in and pump environment debris out, extending service life in submerged and wet operating conditions.
The upper ball bearing supports the motor shaft at its top end, carrying radial loads generated by the rotating impeller assembly while keeping the shaft centered and stable during pump operation. When this bearing begins to wear, symptoms typically include increased vibration, audible rumbling or grinding from the motor housing, and accelerated wear on nearby seals and shaft surfaces. Left unaddressed, a failed upper bearing can allow shaft deflection that damages motor windings and leads to full pump failure — making timely replacement critical for continuous dewatering service.
Part Details
| Part Number | 1042616 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Upper Ball Bearing #6306ZZC3 |
Compatibility & Fitment
| Name | Model |
|---|---|
| MQ Submersible Pumps Clean Water | ST4125D |
| MQ Submersible Pumps Clean Water | ST6125D |
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.
