Original Genuine New Robot Spare Part ABB 3HAC058991-004 Motor Good Performance for Industrial Control

ABB 3HAC058991-004 is an ABB Robotics spare part commonly listed as a motor including pinion (a rotating AC motor supplied with the pinion gear already fitted). In ABB spare parts documentation for the IRB 6660, this part number appears in the “frame to lower arm” section and is explicitly associated with the “Motor Inc. Pinion” entries and the Graphite White color variant.

What makes this part practical in real maintenance work is the “including pinion” detail: instead of sourcing a bare motor and separately handling the pinion installation (alignment, press-fit, potential runout issues), the motor arrives as a ready assembly, which reduces assembly variability and helps protect the robot’s gearbox interface from avoidable installation mistakes.

What It Is and Where It’s Used

Based on public parts catalogs and spare-parts references, 3HAC058991-004 is used for axes 2–3 applications on ABB robots such as IRB 660 and IRB 6660, with -004 denoting a Graphite White variant (with other color variants often listed as -003 and -005).

Axes 2 and 3 are “heavy-lift, high-duty” joints in many ABB palletizing and handling robots. They see frequent acceleration and deceleration, high inertia swings, and repetitive cycles—exactly the environment where motor health, gear mesh quality, and encoder/brake integrity matter most. When this motor-and-pinion assembly is healthy, you get stable cycle times, consistent path accuracy, and lower mechanical stress on the drivetrain.

Key Value for Maintenance and Repair Teams

1) Reduced assembly risk (pinion pre-installed)

Installing a pinion incorrectly can introduce:

• gear mesh noise and vibration

• accelerated wear on gearbox input

• backlash growth and repeatability drift

• premature bearing load issues

A motor shipped with the pinion already installed is a “boring” advantage, which is exactly what you want in industrial uptime work: fewer steps, fewer chances to create a new problem while trying to fix the old one.

2) Faster return to production

Robotics downtime is expensive because it often blocks an entire cell (infeed, palletizer, outfeed, safety interlocks). A ready motor/pinion assembly typically reduces service time compared with multi-part rebuild workflows—especially when you factor in validation checks and rework.

3) Better traceability in spares management

ABB’s 3HAC numbering is widely used across spare parts lists and maintenance documentation. The IRB 6660 spare parts list format shows the part number alongside related items in the same assembly, helping procurement teams keep a clean “robot serial → assembly → part number” trace.

Product Summary Table (SEO-Friendly)

When You Typically Replace This Part

Replacement is usually triggered by one or more of the following patterns:

• Axis faults under load (overcurrent trips, torque supervision alarms, intermittent drive errors)

• Abnormal noise (gear mesh whine, clicking, or roughness at specific joint angles)

• Heat rise beyond normal baseline during repetitive cycles

• Repeatability drift or increasing backlash symptoms (especially noticeable on fast pick/place)

• Brake-related issues (holding weakness, delayed release behavior, or inconsistent stopping)

Important nuance: not every axis error is a motor problem. Cable harness fatigue, connector pin fretting, brake release circuits, drive tuning, or gearbox wear can mimic motor failure. A good maintenance workflow typically confirms the root cause before swapping a major assembly.

Installation and Commissioning Notes (Practical, Not Risky)

Robotics motor work is safety-critical: gravity loads, stored energy, and unexpected motion are all on the menu if procedures are sloppy. So keep it disciplined.

After installing a motor-and-pinion assembly like 3HAC058991-004, service teams generally verify:

1. Mechanical fit and torque discipline
   Correct fastener torque, correct seating, no forced alignment.

2. Cable routing and connector integrity
   Make sure the connector is fully seated, strain relief is correct, and no cable is pre-tensioned across motion.

3. Lubrication/grease compatibility
   Use the robot’s recommended lubricant practices for the affected drivetrain interfaces (avoid “mystery grease mixing”).

4. Axis mastering / calibration requirements
   Motor replacement can require re-checking mastering or calibration to restore positional accuracy.

5. Test cycle at low speed, then ramp
   Start with controlled motion and supervision checks before returning to full production speeds.

(Those are general best practices; the exact steps depend on robot variant, controller generation, and the service documentation used by your team.)

How to Avoid Wrong-Item Purchases (The Part Number Trap)

Spare parts for ABB robots often have close-looking siblings: different colors, different revisions, and sometimes different mechanical interfaces. Public references commonly list other variants in the same family (for example -003 and -005) alongside -004, which is why quoting the full part number matters.

Procurement checklist (recommended):

Sourcing Notes (Realistic, No Sugarcoating)

This part number is widely echoed across third-party supplier listings (for example, listings that describe it as a robot spare part “servo motor… motor incl. pinion”).
That can be useful for availability, but it also means counterfeit risk is non-zero in the open market.

For higher confidence sourcing:

• prefer authorized channels or highly traceable distributors

• require serial/label photos and documentation matching

• insist on proper packaging (shock protection, moisture control) for storage and shipment

• verify return/warranty terms in writing

Short Closing

ABB 3HAC058991-004 is best understood as a motor including pinion assembly used in ABB robot drivetrain service contexts—commonly associated with axes 2–3 and referenced in IRB-series spare parts materials (including IRB 6660 spare parts listings).