ABB 3HAC021346-003 Reduction Gear for IRB 2400

Overview

ABB 3HAC021346-003 Reduction Gear for IRB 2400: Migration-Ready Replacement for Legacy Robot Systems

The ABB 3HAC021346-003 is a precision reduction gear unit designed for the ABB IRB 2400 industrial robot series — one of the most widely deployed 6-axis articulated robots in automotive, metal fabrication, and general manufacturing environments. As the IRB 2400 platform ages and OEM spare part availability tightens, the 3HAC021346-003 gearbox has become a critical component in both scheduled maintenance programs and emergency breakdown recovery. KNMKS maintains verified in-stock inventory of this unit, pre-shipment tested and backed by a support terms confirmed by quotation, to support facilities managing legacy robot fleets through extended service life or phased migration to newer platforms.

Whether your facility is running a full IRB 2400/10, IRB 2400/16, or IRB 2400L configuration, the 3HAC021346-003 reduction gear addresses joint wear, backlash accumulation, and positional drift — the most common failure modes that degrade path accuracy and trigger alarm codes in the IRC5 controller. Replacing this unit restores the robot to factory-specified repeatability without requiring a full robot replacement or a costly platform migration.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful 3HAC021346-003 replacement begins well before the unit arrives on-site. Maintenance engineers should pull the robot’s service history from the IRC5 controller log to confirm whether the gearbox failure is isolated or symptomatic of broader drivetrain wear. In many IRB 2400 installations, joint 2 and joint 3 gearboxes wear in tandem due to shared load cycles — so it is common practice to inspect the adjacent axis gearbox (such as the 3HAC17326-1 cross-reference unit) at the same time to avoid a second unplanned shutdown within the same maintenance window.

Before removing the old gearbox, engineers should document the current axis positions and save the robot program and calibration data from the IRC5 controller to a USB backup. The IRC5 cabinet houses the axis computer boards and drive units that will remain in service; these do not require replacement during a gearbox swap, but the SMB (Serial Measurement Board) connection should be inspected for corrosion or loose contacts, as SMB faults are frequently misdiagnosed as gearbox failures.

Wiring and terminal adaptation is straightforward for this unit — the 3HAC021346-003 uses the same mechanical interface as the original factory-installed gearbox, so no bracket modification or cable extension is required. However, engineers should verify that the grease type and fill volume match ABB’s specification (typically Optimol Longtime PD2 or equivalent) before reassembly, as incorrect lubrication is a leading cause of premature gearbox failure after retrofit.

For facilities running multiple IRB 2400 robots on the same production line, it is advisable to keep a spare 3HAC021346-003 unit on the shelf alongside other high-turnover components such as the IRC5 axis computer (DSQC 661), the SMB board (3HAC025338-001), and the teach pendant cable assembly. This spare parts strategy, combined with a support terms confirmed by quotation on each unit supplied by KNMKS, significantly reduces the risk of extended downtime caused by supply chain delays for discontinued or long-lead ABB components.

Downtime Control During System Migration

Minimizing downtime during a gearbox replacement on an IRB 2400 requires a structured approach. The recommended sequence is: (1) place the robot in a safe maintenance position using the FlexPendant, (2) isolate power at the IRC5 cabinet and lock out the axis drives, (3) record all axis revolution counter values before disconnecting the SMB cable, and (4) perform the mechanical swap using the torque values specified in the ABB Product Manual for IRB 2400 (document 3HAC022033-001).

After reinstalling the 3HAC021346-003, the revolution counter must be updated for the affected axis before the robot is returned to automatic mode. Skipping this step will cause the IRC5 to generate a calibration error and prevent program execution. The fine calibration procedure using the calibration pendulum or laser tracker should be performed if path accuracy is critical to the application — for example, in arc welding or precision assembly cells where TCP (Tool Center Point) deviation of more than 0.1 mm is unacceptable.

For facilities that cannot afford a full production stop, a parallel commissioning approach is possible: prepare the replacement robot arm or a spare axis assembly off-line, swap the complete arm, and return the production robot to service while the gearbox replacement is completed on the spare. This approach is particularly effective in high-volume automotive lines where the IRB 2400 is running two or three shifts per day. KNMKS’s in-stock availability of the 3HAC021346-003 supports this strategy by eliminating the lead time uncertainty that typically forces extended shutdowns when sourcing through standard distribution channels.

Retrofit Support FAQ

Q1: Is the 3HAC021346-003 a direct drop-in replacement for the original ABB IRB 2400 gearbox?
Yes. The 3HAC021346-003 is the OEM-specified reduction gear for the IRB 2400 series. It uses the same mechanical interface, flange dimensions, and lubrication specification as the factory-installed unit. No bracket modification or cable rerouting is required. Confirm the axis position (joint 2 or joint 3) against your robot’s serial number and configuration before ordering.

Q2: What calibration steps are required after replacing the gearbox?
After mechanical installation, the revolution counter for the affected axis must be updated via the FlexPendant. If the application requires high path accuracy (e.g., welding, dispensing, or assembly), a full fine calibration using a calibration tool or laser tracker is recommended. The IRC5 controller will prompt for calibration on first power-up after the SMB cable is reconnected.

Q3: Does KNMKS test units before shipment, and what support terms is provided?
Yes. All 3HAC021346-003 units supplied by KNMKS undergo pre-shipment functional testing to verify mechanical integrity and dimensional conformance. Each unit is covered by a support terms confirmed by quotation from the date of shipment. In-stock units are available for immediate dispatch to minimize your downtime exposure.

Q4: Can this gearbox be used in an IRB 2400 robot controlled by an older S4C+ controller?
The 3HAC021346-003 gearbox is mechanically compatible with IRB 2400 robots regardless of controller generation. However, if your robot is running an S4C+ (M2000) controller rather than the IRC5 (M2004), verify that the axis computer firmware and calibration software version support the installed RobotWare release. KNMKS technical support can assist with compatibility verification prior to order confirmation.

© 2026 KNMKS. All rights reserved.
Original Source: https://knmks.com
Contact: [email protected] | +86 18359268345

Product Identification

Brand / Ecosystem

ABB
ABB

Model / Series

IRB24003HAC021346-003 3HAC021346-003 IRB24003HAC17326-1
IRC5 Series

Product Family

Other Components

Availability Status

Available on request after model and quantity confirmation

Inquiry Type

B2B RFQ, replacement inquiry and project spare-part request

Pre-Quote Check

Exact SKU, brand, series, quantity, nameplate photos and destination country are checked before quotation

Specification & Inquiry Focus

Component range

Breakers, terminals and cabinet accessories

Common needs

Model, photo and installation requirement

Project support

Maintenance and mixed spare-part inquiry

Inquiry Support

• Mixed automation spare parts inquiry
• Cabinet component and accessory support
• Model identification from photos or labels

What to Send Us

• Brand and exact model number: ABB IRB24003HAC021346-003 3HAC021346-003 IRB24003HAC17326-1
• Quantity and required delivery time
• Application, replacement requirement or nameplate photo
• Destination country and shipping preference