ABB 3HAC055450-003 Rotary AC Motor with Pinion for IRB 6700 Axis 2

Axis 2 Rotary AC Motor with Pinion for ABB IRB 6700 Manipulators

Specifications

Industrial Applications

• Heavy-payload material handling — transferring large castings, forgings and steel parts between stations on IRB 6700 cells.
• Spot welding and large-body assembly in automotive body shops, where axis 2 carries the highest static load of any joint in the cycle.
• Machine tending — loading and unloading CNC machining centres, presses and injection moulding machines.
• Palletizing and depalletizing of heavy packaged goods at end-of-line.
• Foundry and forge part transfer under high-duty-cycle conditions, including Foundry Plus protected robots.
• Scheduled axis-2 motor renewal during major overhaul, or replacement after an axis-2 drive fault, brake fault or feedback fault.

Design Purpose

Axis 2 is the joint that swings the lower arm of the robot forward and back. It carries the weight of everything above it — upper arm, wrist, tool and payload — and it does so at the longest lever arm in the machine. The torque demand at that joint is therefore the highest in the manipulator, which is why ABB supplies the axis-2 motor as a dedicated article rather than a general-purpose servo, and why it is delivered with the pinion already mounted on the shaft: the pinion is the interface that transmits motor output into the axis-2 gearbox, and making it part of the delivered assembly removes a press-fit step from the field replacement.

The design detail that matters most to a buyer is not the motor itself but the versioning around it. ABB's IRB 6700 documentation splits the installed motors into type A and type B, identified by article number and visually by whether the motor flange carries an evacuation feature. The type B flange includes evacuation specifically to reveal failure of the primary sealing between the gearbox and the motor — an early-warning path for gearbox oil migrating into the motor. ABB is explicit that the article numbers in that identification table are for identifying what is installed and cannot be used to order spare parts; spare-part numbers come from the separate spare-parts manual. In practice this means 3HAC055450-003 has to be matched by article number, robot variant and serial number — not by "axis-2 motor for IRB 6700" alone.

Common Failure Modes

• Overcurrent or overheat tripping — the drive unit reports motor overload after sustained heavy-duty cycles at axis 2.
• Feedback-device fault — loss of position feedback, giving axis-2 position drift or a fault during homing.
• Holding-brake failure — the lower arm sags or drops when the servo is switched off.
• Gearbox oil entering the motor — primary sealing between the gearbox and the motor fails. This is the failure mode the type B motor flange evacuation is designed to reveal.
• Abnormal noise or vibration from axis 2 — worn pinion teeth, bearing damage, or contamination inside the motor.
• Insulation degradation or ground fault — the axis-2 drive trips as soon as the motor is enabled.
• Wrong article fitted — ordered by axis number or robot model without checking the variant, the motor type, or the replaced-product cross-reference.

Alarm codes for this unit are shown on the controller display. Send us the fault code and we confirm the diagnosis and the matching spare part.

Why Choose Us

• Specialized in industrial robot spare parts for ABB, FANUC, KUKA and YASKAWA.
• Variant and motor-type confirmation before quotation: we check your IRB 6700 variant, the axis, and the type A / B question against your serial number, so you receive the article your machine actually carries.
• Cross-reference support: if your unit was originally supplied under 3HAC043453-003, we confirm the match before you commit to an order.
• We flag the articles that look similar but are not interchangeable, including the IRB 6640 axis-2 motor, rather than leaving the substitution to assumption.
• Each unit is inspected and tested (encoder signal, insulation resistance) before packing, with secure industrial packaging and full order tracking from Shanghai.
• Quote-based service — send your inquiry with the robot model, serial number, axis and the marking on your existing unit for a matched offer.

Related Products

• 3HAC043453-003 — listed in ABB spare-part data as the replaced product ID for this article number (IRB 6700 axis-2 motor, earlier number)
• 3HAC055450-004 — the other variant in the same 3HAC055450 series; distinguish by IRB 6700 variant and protection class before ordering
• 3HAC057542-003 — axis-2 motor with pinion for the IRB 6640 platform (different series — not interchangeable with this part)
• 3HAC057339-003 — removal tool M12 for parting the axis-2 motor from the gearbox, per the ABB IRB 6700 product manual
• 3HAC15534-1 — motor lifting accessory specified in the ABB IRB 6700 product manual for axis-2 motor handling