ABB 3HAC037281-001 Axis 1-2 Motor with Gearbox for IRB 120

ABB IRB 120 Axis 1-2 Servo Motor with Gearbox — Technical Overview

The 3HAC037281-001 is a rotational AC servo motor with integrated gearbox, designed to drive Axis 1 (base rotation) and Axis 2 (shoulder pivot) of ABB IRB 120 industrial robots. The detail below consolidates what we confirmed from ABB catalog data and our inspection records, alongside open items that require verification before order.

Specifications

Industrial Applications

• Electronics assembly lines for PCB handling, soldering, and component insertion.
• Small-parts pick-and-place cells in packaging and food-grade facilities.
• Laboratory automation and pharmaceutical sample handling.
• Education and research robot training cells.
• Light CNC machine tending for small workpieces.
• Polishing, deburring, and dispensing of compact components.

Design Purpose

The axis 1-2 motor unit combines a servo motor with an integrated reduction gearbox in a single bolt-on assembly, so installation does not require separate gear meshing or alignment on the robot structure. Axis 1 carries the mass of the entire robot, and Axis 2 supports the upper arm and payload; both must deliver high torque at low speed with high stiffness for repeatable point-to-point motion. The integrated gearbox raises the output torque to the level required for these load-bearing axes without enlarging the motor envelope beyond the IRB 120's compact body, preserving the robot's reach and footprint.

Common Failure Modes

The following symptoms are typically observed on a degraded IRB 120 axis 1-2 motor-and-gearbox assembly. They are generic descriptions only; for diagnostics specific to your cell, share the controller event log with our engineering team.

• Overcurrent or overheat tripping — the drive unit reports motor overload after sustained axis 1-2 motion under load.
• Encoder or resolver feedback loss — positioning drift or controller-reported feedback error during homing and motion.
• Increased backlash from gear-tooth wear in the integrated gearbox — visible position repeatability loss and audible knocking under load reversal.
• Bearing seizure or roughness — vibration rises during constant-speed moves, grease purge from seals.
• Holding-brake failure (fail-safe brake on axis 1-2) — the arm sags or drops when servo power is removed.
• Insulation degradation or ground fault — the axis 1-2 drive trips the moment the motor is enabled.

Why Choose Us

• Focused ABB robot spare-parts supplier covering servo motors, drive units, gearboxes, and teach pendants for IRB-series robots.
• Each axis motor is inspected and tested (feedback signal, insulation resistance, gearbox action) before packing.
• Cross-reference support — if your unit was originally shipped under 3HAC14550-4/08A or HAC3696-1/3, we confirm compatibility against your robot serial number.
• Engineering assistance with adjacent IRB 120 axes (3, 4, 5, 6) and compatible compact-robot platforms such as IRB 1200.
• Multiple payment methods accepted — PayPal, T/T, and Alibaba Trade Assurance.

Related Products

• ABB 3HAC14550-4/08A — same physical motor unit, alternate ABB catalog number for IRB 120 Axis 1-2.
• ABB HAC3696-1/3 — same physical motor unit, regional ABB catalog cross-reference.
• ABB 3HAC045978-001 — Axis 5 Servo Motor with Pulley for IRB 1200 (compact-robot family, similar motor-with-drive-integration concept).
• ABB 3HAC17330-1 — Motor M30 Type B (Axis 5 with Pinion) for IRB 2400 (compact-robot servo motor, 484 W rating).
• ABB 3HAC040657-002 — MU300 External Axis Servo Motor Unit for IRC5 (option when adding an external travel axis to IRB 120).