ABB 3HAC028837-004 Axis 1 Gearbox TS245RHS-125 for IRB 2600 / IRB 4600

Axis 1 Reduction Gearbox for ABB IRB 2600 / IRB 4600 Robots

Specifications

Industrial Applications

• Axis-1 reduction / torque transmission inside ABB IRB 2600 and IRB 4600 robot manipulators.
• Replacement of a worn, noisy or backlash-degraded axis-1 gearbox in IRB 2600 / IRB 4600 cells.
• Preventive maintenance and axis-level rebuild programs to restore robot repeatability.
• Spare-part holding for MRO teams and system integrators running IRB 2600 / IRB 4600 lines.

Design Purpose

Robot motion accuracy and repeatability depend on the joint reduction gear transmitting motor torque at the correct ratio with minimal backlash. Axis 1 carries the full manipulator load and swinging mass, so its gearbox must hold stiffness and precision under continuous duty. The ABB 3HAC028837-004 is the defined axis-1 reduction gearbox (designation TS245RHS, 125 reduction ratio) for the IRB 2600 / IRB 4600 families — it is the exact-fit spare called out in ABB's documentation and spare-parts manuals, not a generic reducer.

Because ABB gearbox versions are tied to the robot model, axis position, design variant and reduction ratio, this is a fitment-specific spare. The correct part is matched by the complete article number, robot serial and spare-parts list rather than by external appearance — neighbouring versions are not interchangeable. This is a confirmed-fitment spare, verified against the robot's parts list.

Common Failure Modes

• Increased backlash / lost motion causing position-accuracy drift and path errors.
• Abnormal noise or vibration from worn gears or bearings.
• Overheating from insufficient or degraded grease / poor lubrication.
• Leaking or contaminated lubricant, or failed seals.
• Cracked housing or mounting-face damage from overload or impact.
• Wrong gearbox fitted (axis position / robot variant mismatch) causing mechanical interference or no-go.

Why Choose Us

• Genuine ABB 3HAC028837-004 axis-1 reduction gearbox (TS245RHS-125, 125 ratio) — the defined IRB 2600 / IRB 4600 spare, not a generic reducer.
• Fitment confirmation: we verify robot model, variant and serial from your documentation so you receive the correct part.
• Condition confirmed before ordering (new original or used original); quotation-based supply with no stock or dispatch-time promises.
• Backed by the ABB IRB 2600 / IRB 4600 spares we supply across the robot range.

Related Products

• 3HAC039109-004 — ABB IRB 2600 / IRB 4600 reducer (same robot-family gearbox spare). Different axis position from the axis-1 3HAC028837-004; not interchangeable — confirm the required axis before ordering.
• 3HAC028837-001 — earlier ABB article number referenced as the predecessor of 3HAC028837-004; confirm current configuration with your spare-parts list.
• Not sure which IRB 2600 / IRB 4600 axis gearbox your unit needs? Send the robot model, variant and serial number and we confirm the correct spare — including whether 3HAC028837-004 is the right axis-1 gearbox.