Yaskawa 6002ZZCM/5KU45 L-Axis Speed Reducer – Obsolete HP20 HP20D Spare Part

Technical Dossier

Product Details And Specifications

Yaskawa 6002ZZCM/5KU45 L-Axis Speed Reducer – Obsolete HP20 HP20D Spare Part

When the L-axis speed reducer on a Yaskawa HP20 or HP20D robot fails, the production line stops. Not for hours — for weeks, sometimes months. The HP20 series has been discontinued, and OEM replacement units are no longer manufactured. A single failed joint gearbox can force plant management into a decision no one wants to make: a full robotic cell upgrade costing $300,000–$800,000 USD, plus the engineering hours, reintegration downtime, and retraining costs that follow.

DriveKNMS holds verified physical stock of the Yaskawa 6002ZZCM/5KU45 L-axis speed reducer (also referenced as HW9381633-A / HW0387753-C). This is not a substitute or cross-reference — it is the exact assembly required for HP20 and HP20D arm maintenance. Securing one unit now is the lowest-cost insurance policy available against a catastrophic production halt.

Technical Specifications

Solving the Discontinued Hardware Crisis

The Yaskawa HP20 and HP20D were workhorses of automotive, metal fabrication, and general assembly lines throughout the 2000s and 2010s. Many facilities running these robots have no immediate budget or operational window for a full cell replacement. The L-axis speed reducer is a high-wear component — it absorbs the mechanical load of the lower arm through thousands of duty cycles per day. When it degrades, symptoms appear gradually: increased positioning error, abnormal joint noise, and eventually a hard fault that takes the robot offline.

The core problem facing maintenance engineers today is not technical — it is sourcing. Yaskawa's authorized service network no longer stocks this assembly. Third-party machine shops cannot replicate the precision tolerances of the original harmonic or cycloidal drive mechanism. The only viable path to restoring a downed HP20 without a capital expenditure is locating genuine OEM stock from specialist distributors.

Facilities that have extended their HP20/HP20D fleet life by 5–10 years beyond OEM support typically follow three practices: they maintain a minimum of one critical joint spare per robot cell, they schedule proactive gearbox inspection at 20,000-hour intervals, and they partner with verified obsolete-parts suppliers before a failure occurs — not after. Reactive sourcing of discontinued components under production pressure routinely costs 3–5x the price of planned procurement, when stock can be found at all.

Condition & Reliability Assurance

Every unit shipped by DriveKNMS passes a structured 5-step inspection protocol before dispatch:

• Step 1 – Visual and Mechanical Inspection: Housing integrity check, seal condition, input/output shaft runout measurement.
• Step 2 – Electrolytic Capacitor Assessment: Where integrated drive electronics are present, capacitor aging and ESR values are evaluated. Aged capacitors are flagged and disclosed.
• Step 3 – Firmware and Label Verification: Part number, revision code, and manufacturing date codes are cross-checked against Yaskawa documentation to confirm authenticity and compatibility.
• Step 4 – Pin and Connector Corrosion Inspection: All mating surfaces, connector pins, and ground points are inspected under magnification. Oxidation is treated or the unit is quarantined.
• Step 5 – Functional Rotation Test: The gearbox is rotated under load simulation to confirm smooth operation, absence of binding, and acceptable backlash within OEM tolerance bands.

Condition grade (New / Refurbished-Grade-A / Tested-Used) is disclosed in full on every invoice. No unit is shipped without a passed inspection record.

Key Features for System Maintenance

• Drop-in replacement: Identical mounting pattern, shaft dimensions, and gear ratio to the original OEM assembly. No mechanical modification required.
• No reprogramming required: The robot controller (XRC, NX100, or equivalent) does not require parameter changes when replacing a like-for-like speed reducer. Calibration is limited to standard zero-point mastering.
• Avoids engineering reconstruction costs: Replacing this gearbox preserves the existing robot program, tooling offsets, and cell layout. A new robot platform would require full path reprogramming, safety validation, and production requalification — typically 4–8 weeks of engineering time.
• Extends asset life by 5–10 years: A functioning L-axis drive restores the robot to full rated payload and repeatability. For facilities with stable production requirements, this is a direct alternative to capital expenditure.
• Supports legacy controller compatibility: Verified compatible with Yaskawa XRC and NX100 controller generations commonly paired with the HP20/HP20D platform.

FAQ

Q: What warranty applies to a discontinued part?
A: DriveKNMS provides a 90-day functional warranty on all tested and refurbished units. New old-stock (NOS) units carry a 180-day warranty. Warranty covers mechanical function under normal operating conditions and excludes damage from improper installation or overload.

Q: How do I confirm this is a genuine OEM part, not a counterfeit?
A: We provide full photographic documentation of the part number label, serial number, and inspection records prior to shipment. Customers may request a video inspection call before purchase. We do not source from unverified secondary markets.

Q: Should I buy more than one unit?
A: For facilities operating multiple HP20/HP20D robots, holding a minimum of one L-axis spare per two robots is standard practice among maintenance teams managing discontinued platforms. Given that global stock of this assembly is finite and not replenished, procurement delay carries real risk. Current inventory is limited — contact us for quantity availability.

Q: Can this part be used with the HP20D variant?
A: The HP20D shares the same L-axis drive assembly as the HP20. Confirm your robot's serial number and axis configuration with our technical team before ordering if there is any uncertainty.