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Help CenterABB 1MRB150051R1 – Genuine Motor Bearing (Factory‑coded Spare for ABB Motors)
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The ABB 1MRB150051R1 is a factory-coded, OEM motor bearing selected by ABB for specific low-voltage motor builds. From my experience, using the exact ABB-coded spare typically keeps vibration levels predictable and helps avoid fit tolerance surprises during maintenance shutdowns. It’s a straightforward way to restore performance on fans, pumps, compressors, and process line drives without guessing the bearing variant or clearance class.
Key FeaturesOEM-specified fit – Matched to the original ABB bill of materials, so the geometry and internal clearance align with the motor’s design.
Electric-motor grade – In many cases supplied with EMQ-quality raceways and cage, helping reduce noise and heat at nominal load.
Correct clearance class – Typically C3 (or as specified by the motor BOM) to accommodate thermal growth in continuous-duty applications.
Grease and sealing to spec – Delivered sealed or open as per ABB selection; lubrication type is defined for the target motor, minimizing guesswork.
Traceability – Supplied under the ABB 1MRB code for documentation, maintenance records, and procurement control.
Service-ready packaging – Packed to protect the raceways during storage and handling; you might notice fewer handling marks compared with bulk alternatives.
| Brand / Model | ABB 1MRB150051R1 |
| Part Type | Genuine ABB motor bearing (factory-coded spare) |
| Typical Clearance Class | Typically C3 for electric motor duty (as defined by the ABB BOM) |
| Lubrication / Sealing | Open or sealed per ABB selection for the target motor; delivered ready for installation |
| Operating Temperature | Common EMQ bearing range: approx. -20°C to +120°C (verify against motor documentation) |
| Dimensions & Weight | Defined by ABB for the specific motor frame; refer to the motor BOM/nameplate |
| Installation Method | Interference fit on shaft/housing; install using a bearing heater or press tools applied to the correct ring |
| Compliance | Manufactured under ISO 9001 systems; materials typically RoHS compliant |
This spare is used where ABB specifies 1MRB150051R1 in the motor’s parts list—commonly in continuous-duty plant assets. You’ll typically see it during planned overhauls or vibration-triggered corrective maintenance in:
HVAC and process fans (low vibration targets, steady-state duty)
Pumps in water/wastewater, chemical, and food plants
Compressors and blowers with frequent start/stop or VFD operation
Conveyors and general-purpose drives in mining, paper, and metals
Right part, first time – The ABB code ties directly to the motor BOM, which in many cases prevents the wrong clearance or seal type.
Reduced downtime risk – Predictable fit and performance help shorten outage windows during turnarounds.
Lifecycle consistency – Matching the original bearing specification can stabilize vibration signatures for trending programs.
Traceable sourcing – Easier audit trail and warranty alignment compared with generic equivalents.
Preparation – Store the bearing in a clean, dry area; do not unseal until immediately before installation. Avoid shock loads and keep in original packaging.
Tools – Use an induction heater or correctly sized press tools. Apply force only through the ring being fitted (inner ring for shaft fit, outer ring for housing fit).
Grounding & VFDs – For inverter-driven motors, ensure shaft grounding or insulated arrangements are in place to mitigate stray currents.
Alignment – After installation, check axial endplay and rotor free rotation. A quick no-load run can reveal early noise or temperature issues.
Relubrication – If the motor’s design uses open bearings, follow the ABB relube interval and grease type specified. For sealed bearings, do not attempt to relubricate.
Condition monitoring – Track vibration (velocity/envelope) and temperature. You might notice that returning to the OEM spec helps your baselines look “normal” again.
Safety – Lockout/tagout the motor, and allow it to cool. Handle heated bearings with insulated gloves and observe hot-work precautions.
Manufactured under ISO 9001 quality systems
Materials typically RoHS compliant; CE/UL not applicable to mechanical bearings
Standard ABB spare-parts warranty (commonly 12 months from delivery when installed by qualified personnel; confirm against your order terms)
For a like-for-like overhaul, teams typically pair the 1MRB150051R1 with the opposite-end bearing specified in the same motor BOM, plus new shaft seals and circlips. If your motor is VFD-driven and you’ve seen electrical fluting, consider the ABB-approved insulated bearing variant (where specified) and a shaft grounding device.
A maintenance supervisor from a pulp mill told us that swapping to the exact ABB-coded bearing brought their fan vibration back within alarms “without having to re-tune our thresholds,” which seems to be the difference a matched clearance can make.
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