ABB 3HAC028837-001 Axis 1 Reduction Gear for IRB 2600 Robots

Axis 1 Reduction Gear for ABB IRB 2600 Manipulators

Specifications

Industrial Applications

• IRB 2600-20/1.65 and IRB 2600-12/1.65 cells in material handling, machine tending, arc welding and general assembly.
• Replacement of a base-joint gearbox showing increased backlash, noise or loss of repeatability at axis 1.
• Recovery after a collision or overload at the base joint, where the gear teeth or bearings have been damaged.
• Scheduled major overhaul where the axis-1 gear, seals and oil are renewed together.
• Refurbishment of a used IRB 2600 before it returns to a production cell.

Design Purpose

Axis 1 is the base rotation of the robot — the joint that swings the entire arm, and therefore the joint carrying the weight and inertia of everything above it. Its reduction gear does what every robot joint gear does: it takes the servo motor's high speed down to a working joint speed and multiplies torque in the same proportion. At axis 1 that conversion is what makes the difference between a robot that slews smoothly under a loaded arm and one that lags, vibrates or drifts.

ABB's own spare-parts documentation makes a point that matters more here than on most parts: there are non-compatible versions of the axis-1 and axis-2 gearboxes, and which version a robot carries depends on the variant and, in the affected models, on the gearbox supplier. That is why the manual identifies the gearbox by article number rather than by robot model, and why an IRB 2600 Type C machine takes a different axis-1 gear from a non-Type C one. In practice this makes 3HAC028837-001 a verified-identity spare: the robot type is read from the FlexPendant or the nameplate, the variant is confirmed, and only then is the gear ordered.

Common Failure Modes

• Increased backlash or lost repeatability at the base joint — the gear train is worn and axis 1 no longer holds position accurately.
• Noise or vibration when the robot slews, often the first sign of gear or bearing wear at axis 1.
• Oil leakage at the joint seals, followed by lubrication loss and accelerated wear.
• Gear tooth or bearing damage after a collision or repeated shock loading at the base.
• Positioning drift at axis 1 that reappears after the counter procedure has been repeated.
• Wrong gearbox version fitted — ordered by axis number or robot model without checking the variant and the article-number version.

Specific alarm codes are not officially documented for this model. Please contact us with the fault code displayed on your controller for accurate diagnosis.

Why Choose Us

• Specialized in industrial robot spare parts for ABB, FANUC, KUKA and YASKAWA.
• Version confirmation before quotation: we check your IRB 2600 variant — Type C or not — and the axis, so you receive the gearbox version your machine actually carries.
• We read the compatibility rules with you: axis 1 and axis 2 take different articles, and the manual lists non-compatible versions, so nothing is left to assumption.
• We can supply the gearbox oil and seals with the gear, so the job is not held up by a missing consumable.
• Quote-based service — send your inquiry with the robot type, serial number, axis and the marking on your existing unit for a matched offer.

Related Products

• 3HAC039109-001 — axis-2 gearbox for IRB 2600-20/1.65 and IRB 2600-12/1.65 (the paired axis-2 article)
• 3HAC028837-004 — axis 1 reduction gearbox for ABB IRB 2600 / IRB 4600 robots
• 3HAC043130-001 — axis-1 gearbox for IRB 2600 Type C variants (different version — not interchangeable)
• 3HAC029896-001 — IRB 2600 customer-connection manipulator harness, axes 1-6
• 3HAC032140-004 — synthetic