Industrial Robot Joint Solution – Yaskawa HW9381633-A | HP20 / HP20D | L-Axis Speed Reducer
Where This Product Is Used
The Yaskawa HW9381633-A (also referenced as HW0387753-C) is the OEM L-Axis (Axis-2) speed reducer designed for the Yaskawa Motoman HP20 and HP20D 6-axis industrial robots, specifically the MA1900 controller generation. This precision harmonic or RV-type reducer is the critical joint drive component that governs the robot’s second-axis (L-axis) rotational motion, torque transmission, and positional repeatability.
- Automotive body welding lines – spot welding and arc welding cells requiring ±0.06 mm repeatability
- Automotive assembly – door panel handling, windshield installation, and press-tending
- General material handling – palletizing, depalletizing, and heavy payload transfer (up to 20 kg)
- Machine tending – CNC lathe and machining center loading/unloading
- Casting & forging – high-temperature part extraction and die-casting extraction
- Painting & sealing – seam sealing and adhesive dispensing on automotive body lines
Technical Specifications
| Part Number (Primary) | HW9381633-A |
| Cross-Reference / Alt P/N | HW0387753-C |
| Bearing / Gear Assembly P/N | 6002ZZCM/5KU45 |
| Compatible Robot Models | Yaskawa Motoman HP20, HP20D |
| Compatible Controller | MA1900 |
| Axis | L-Axis (Axis 2 – Shoulder Joint) |
| Reducer Type | Precision RV / Harmonic Drive (OEM specification) |
| Payload Capacity (Robot) | 20 kg (44 lbs) |
| Repeatability | ±0.06 mm |
| Weight (Component) | 420 g (approx.) |
| Condition | New / Refurbished (specify at inquiry) |
| Origin | Japan (Yaskawa OEM) |
Why Engineers Specify This Model
- OEM-matched geometry – direct bolt-on replacement; no shimming or machining required
- Zero backlash design – maintains ±0.06 mm TCP repeatability over the robot’s rated service life
- High torque density – compact form factor delivers the rated L-axis output torque for 20 kg payload operations
- Sealed bearing assembly (6002ZZCM) – double-shielded bearing minimizes contamination ingress in foundry and welding environments
- Drop-in compatibility – validated against HP20 and HP20D mechanical drawings; no firmware or parameter changes required
- Reduced downtime – stocked component enables same-week dispatch versus 8–16 week OEM lead times
Complete System Bill of Materials
When replacing the L-Axis speed reducer on the HP20/HP20D, engineers typically source the following complementary components:
- HW9381633-A – L-Axis Speed Reducer (this item)
- HW0387753-C – Reducer Assembly (cross-reference / sub-assembly)
- 6002ZZCM/5KU45 – Sealed Bearing Unit
- L-Axis servo motor (Yaskawa SGMRV series, consult robot BOM)
- L-Axis motor coupling / brake assembly
- Grease: Yaskawa-specified reducer grease (Vigo Grease RE No.0 or equivalent)
- Sealing gasket / O-ring kit for L-axis housing
Compliance & Industry Standards
- ISO 9283 – Manipulating Industrial Robots: Performance Criteria and Related Test Methods
- ISO 10218-1 – Robots and Robotic Devices: Safety Requirements for Industrial Robots
- RoHS Compliant – materials meet EU Directive 2011/65/EU restrictions on hazardous substances
- CE Marking – component sourced from CE-certified Yaskawa robot platform
- JIS B 0401 – dimensional tolerances per Japanese Industrial Standards for precision mechanical components
Quality Assurance & Sourcing
Konmask.com sources Yaskawa robot components through verified industrial surplus channels, authorized distributors, and OEM-certified repair facilities. Every unit undergoes the following before dispatch:
- Visual and dimensional inspection against OEM drawings
- Part number verification (primary P/N + cross-reference P/N)
- Bearing rotation and backlash check
- Photographic documentation provided on request
- Secure anti-static and foam-padded packaging for international freight
How to Source This Part
- Confirm compatibility – verify your robot’s nameplate shows HP20 or HP20D with MA1900 controller
- Cross-check P/N – match HW9381633-A or HW0387753-C against your maintenance BOM
- Request a quote – contact support@konmask.com or WhatsApp +0086 19859288691 with your robot serial number
- Confirm stock & lead time – our team will confirm availability, condition (new/refurbished), and ETA
- Place order – secure checkout via this product page or proforma invoice for B2B wire transfer
- Receive & install – follow Yaskawa HP20 maintenance manual Section 4 (L-Axis Reducer Replacement) for installation torque specs and grease fill procedure
Application-Specific FAQ
Q: Is HW9381633-A the same as HW0387753-C?
A: They reference the same L-axis reducer assembly at different BOM levels. HW9381633-A is the top-level assembly P/N; HW0387753-C is the sub-assembly or revision cross-reference. Both are interchangeable for ordering purposes on HP20/HP20D robots.
Q: What is the 6002ZZCM/5KU45 bearing used for?
A: This is the double-shielded precision bearing integrated into the L-axis reducer housing. It supports radial and axial loads at the shoulder joint and is included as part of this assembly.
Q: Can this reducer be used on the HP20-6 or HP20D-6 variants?
A: Compatibility depends on the specific mechanical revision. Please provide your robot’s full model number and serial number for confirmation before ordering.
Q: Do you provide installation support?
A: Yes. Konmask provides remote technical guidance and can share the relevant sections of the Yaskawa HP20 maintenance manual. Contact us at support@konmask.com.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. Out-of-stock units have a 2–6 week sourcing lead time depending on global availability.
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Contact: support@konmask.com | +0086 19859288691
