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Product Description
The ABB 421-1-10479-390 is a factory-engineered complete output shaft configuration—a pre-assembled mechanical sub-assembly designed specifically for the wrist joint of ABB large-frame industrial robots, including the IRB 6600, IRB 6650, and select IRB 7600 series . This is not a bare shaft; it is a comprehensive overhaul-level kit comprising the precision-machined output flange shaft, preloaded angular-contact ball bearings, radial shaft seals, planetary-stage sun gear, spacer shims, and fasteners—all pre-lubricated with ABB-specified grease . Its purpose is to restore the robot’s original repeatability and stiffness by replacing the entire worn transmission interface between the reduction gear and the tool flange.
Application Scenarios
In a high-volume automotive body shop, a fleet of ABB IRB 6600 robots operates 24/7 performing resistance spot welding on car frames. Over years of high-duty cycles, the wrist joints of these robots begin to exhibit increased backlash, audible grinding noises, and unacceptable TCP (Tool Center Point) drift. The production team had previously attempted to replace individual bearings and gears as they failed, only to find that the “scatter assembly” approach could not restore the original ±0.05 mm repeatability, leading to weld quality rejects .
The maintenance manager switched to using the ABB 421-1-10479-390 as the standard replacement kit for all major wrist overhauls. The kit eliminated the trial-and-error of sourcing loose components and guessing bearing preloads. During a scheduled downtime, a service team replaced the complete output shaft assembly in a robot’s Axis 5 with the ABB 421-1-10479-390, performing the required zero calibration post-installation . The robot immediately resumed operation with its original positional accuracy, eliminating quality defects and extending the service interval for that joint by over 40%. The ABB 421-1-10479-390 proved to be the most reliable and efficient way to keep critical welding cells producing at peak quality.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 421-1-10479-390 |
| Manufacturer | ABB Robotics (ABB AB, Robotics & Discrete Automation) |
| Product Category | Complete Output Shaft Configuration / Mechanical Sub-Assembly Kit |
| Primary Application | IRB 6600, IRB 6650, select IRB 7600 robot wrist axes (typically Axis 4/5/6) |
| Kit Contents | Output flange shaft, preloaded angular-contact bearings, radial lip seal(s), sun gear, adjusting shims, circlips, fasteners |
| Shaft Material | Case-hardened alloy steel, ground finish |
| Bearing Type | Precision angular-contact ball bearings, matched pair/duplex, ABEC-3/P6 grade or better |
| Assembly Weight | Approx. 8–18 kg (varies by revision and axis position) |
| Repeatability Restored | ±0.05 mm to ±0.1 mm for IRB 6600 series (depends on model and calibration) |
| Installation Requirement | Requires robot wrist disassembly, ABB service manual tools, and torque wrenches |
| Post-Installation | Mandatory zero calibration and load testing |
| Matching Rule | Must verify with robot full model, serial number (S/N), and axis position |
