ABB IRB 6620 / IRB 6640 RV Reducer Modules: 3HAC024316-008 3HAC024316-006

Technical Dossier

Product Details And Specifications

ABB IRB 6620 / IRB 6640 Series: Comprehensive RV Reducer Range and Technical Overview

The ABB IRB 6620 and IRB 6640 are six-axis industrial robot platforms deployed at scale across heavy-industry sectors including automotive body-in-white assembly, foundry handling, chemical plant material transfer, and nuclear facility maintenance. Both platforms share a common mechanical architecture centered on Nabtesco RV-series cycloidal reducers, which are the primary wear components requiring periodic replacement in high-duty-cycle installations. The IRB 6620 carries a rated payload of 150 kg with a reach of 2.2 m; the IRB 6640 is available in multiple payload/reach configurations (130 kg / 3.2 m, 185 kg / 2.8 m, 205 kg / 2.75 m). Both series are controlled via the ABB IRC5 controller and programmed in RAPID. Installed base globally is estimated in the tens of thousands of units, making reducer availability a critical supply-chain concern for maintenance, repair, and overhaul (MRO) operations.

The Evolution of IRB 6620 / IRB 6640 Reducer Architecture

ABB introduced the IRB 6600 family in the early 2000s as a successor to the IRB 6400 platform, targeting heavier payloads and extended reach. The IRB 6620 and IRB 6640 represent the second-generation refinement of this family, introduced circa 2005–2007, with revised wrist geometry and updated joint reducer specifications. The primary reducer supplier across all joints is Nabtesco Corporation (Japan), whose RV-E and RV-C series cycloidal drives are integrated into axes 1 through 6. Key part numbers 3HAC024316-008 and 3HAC024316-006 correspond to the axis-specific RV reducer assemblies used in the IRB 6620 and IRB 6640 joint configurations. These reducers operate at gear ratios typically between 1:100 and 1:185 depending on axis assignment. As of 2026, both robot series have entered the mature/end-of-production lifecycle phase. ABB continues to supply spare parts under its long-term service agreements, but lead times for OEM reducers have extended significantly. Third-party and refurbished reducer supply has become a primary sourcing channel for operators seeking to extend robot service life beyond 15–20 years of operation.

IRB 6620 / IRB 6640 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented reducer and mechanical spare part range for the IRB 6620 and IRB 6640 platforms. Each entry reflects a specific axis assignment or mechanical sub-assembly.

3HAC024316-008: IRB 6620 axis reducer assembly, RV-550E-242.73 specification, primary joint drive unit.
3HAC024316-006: IRB 6640 / IRB 6620 shared axis reducer, RV-550E-242.73 specification, cross-platform compatible unit.
3HAC026253-001: IRB 6640 axis 1 gearbox assembly, complete housing with output flange.
3HAC025338-001: IRB 6640 axis 2 gearbox unit, rated for full payload configurations up to 205 kg.
3HAC025339-001: IRB 6640 axis 3 gearbox unit, intermediate arm drive assembly.
3HAC025340-001: IRB 6640 axis 4 wrist gearbox, inner wrist rotation drive.
3HAC025341-001: IRB 6640 axis 5 wrist gearbox, wrist bend drive unit.
3HAC025342-001: IRB 6640 axis 6 wrist gearbox, tool flange rotation drive.
3HAC020951-001: IRB 6620 axis 1 gearbox assembly, base rotation drive.
3HAC020952-001: IRB 6620 axis 2 gearbox assembly, lower arm drive unit.
3HAC020953-001: IRB 6620 axis 3 gearbox assembly, upper arm drive unit.
3HAC020954-001: IRB 6620 axis 4 wrist gearbox, inner wrist drive.
3HAC020955-001: IRB 6620 axis 5 wrist gearbox, wrist bend drive.
3HAC020956-001: IRB 6620 axis 6 wrist gearbox, tool flange rotation drive.
3HAC17484-1: Nabtesco RV-550E reducer, bare unit without housing, cross-compatible with IRB 6620/6640 axis 1–3.
3HAC14550-2: Grease kit for IRB 6620/6640 reducers, Castrol Tribol GR 100-0 PD specification.
3HAC028357-001: IRB 6640-185/2.8 axis 2 gearbox, heavy-payload variant.
3HAC028358-001: IRB 6640-205/2.75 axis 1 gearbox, maximum-payload base rotation drive.

Sourcing Hard-to-Find & Obsolete IRB 6620 / IRB 6640 Parts

DriveKNMS maintains a dedicated inventory program for ABB IRB 6620 and IRB 6640 mechanical spare parts, with particular focus on reducer assemblies that have been discontinued or placed on extended lead time by ABB's OEM supply chain. Our sourcing protocol covers three categories: new-old-stock (NOS) units sourced from decommissioned robot lines, factory-refurbished reducers that have been disassembled, inspected, and regreased to OEM specification, and direct Nabtesco RV-series bare units that are cross-referenced to ABB part numbers. For operators running IRB 6620 or IRB 6640 fleets beyond the 15-year service threshold, DriveKNMS provides lifecycle extension consultation, including reducer replacement scheduling based on operating hours and duty-cycle data. All part numbers including 3HAC024316-008 and 3HAC024316-006 are cross-referenced against ABB's spare parts catalog revisions from 2007 through 2024 to ensure compatibility verification before shipment.

Quality Control for the IRB 6620 / IRB 6640 Range

RV cycloidal reducers for the IRB 6620 and IRB 6640 require specialized test procedures that differ from standard gearbox inspection. DriveKNMS applies the following protocol to all reducer units prior to dispatch: (1) Dimensional inspection of output flange and input shaft interfaces against ABB drawing tolerances; (2) Backlash measurement using a calibrated torque arm at rated preload, with acceptance threshold of ≤1 arc-minute for axes 1–3 and ≤2 arc-minutes for axes 4–6; (3) No-load run-in test at rated input speed for a minimum of 30 minutes with thermal monitoring; (4) Grease condition verification — units are purged and repacked with Castrol Tribol GR 100-0 PD or equivalent Nabtesco-approved lubricant; (5) Visual inspection of cycloidal disc, pin gear housing, and output bearing for fretting, spalling, or corrosion. Units that do not pass all five stages are quarantined and not offered for sale. Test records are retained and available upon request for traceability purposes.

For sourcing inquiries on ABB IRB 6620 / IRB 6640 reducers including 3HAC024316-008 and 3HAC024316-006: