YASKAWA HW9381633-A B-Axis Speed Reducer – Motoman Robot Series
When a B-axis speed reducer fails on a Motoman industrial robot, the consequences are immediate and costly: the robot arm loses precise angular control, trajectory deviations trigger safety faults, and the entire production cell comes to a halt. In high-throughput automotive welding lines, semiconductor handling systems, or food-grade pick-and-place operations, even a single hour of unplanned downtime can translate into tens of thousands of dollars in lost output. The YASKAWA HW9381633-A is not a commodity part — it is the precision mechanical heart of the B-axis joint, and there is no generic substitute that can match its torque rating, backlash tolerance, or dimensional fit.
The HW9381633-A occupies a critical position within YASKAWA’s Motoman robot reducer family. Engineered to OEM specification, this B-axis gearbox delivers the high reduction ratio and zero-backlash performance demanded by YASKAWA’s 6-axis articulated robot platforms. As one of the world’s leading industrial robot manufacturers — with over 500,000 Motoman robots installed globally — YASKAWA’s replacement parts ecosystem is a cornerstone of global factory automation maintenance strategies. The HW9381633-A is a sought-after MRO component across Asia, Europe, and the Americas.
Technical Specifications
- Part Number: HW9381633-A
- Manufacturer: YASKAWA Electric Corporation
- Component Type: B-Axis Speed Reducer (Joint Gearbox)
- Series Compatibility: Motoman Robot Series
- Application Axis: B-Axis (Wrist Bend Joint)
- OEM Reference: YASKAWA Original Part
- Condition Available: New OEM / Refurbished / Tested Used
Note: Detailed torque ratings, gear ratio, and dimensional data are available upon request. We do not publish unverified specifications.
Key Features & Benefits
- OEM Precision Fit: Direct drop-in replacement with no machining or shimming required — maintains original robot arm geometry and TCP accuracy.
- Zero-Backlash Design: Harmonic or RV gear technology (per OEM design) ensures repeatable positioning accuracy critical for welding, dispensing, and assembly tasks.
- High Torque Density: Compact form factor delivers high reduction ratio in a lightweight package, preserving robot payload capacity.
- Sealed & Lubricated: Factory-sealed bearing and gear assembly minimizes contamination ingress in harsh industrial environments.
- Long Service Life: Manufactured to YASKAWA’s stringent quality standards for extended MTBF in continuous-duty automation cycles.
- Rapid Restoration: Sourcing this OEM part restores full robot functionality without recalibration of adjacent axes.
Industry & Equipment Applications
- Automotive Manufacturing: Spot welding, arc welding, and body assembly robots requiring high-cycle B-axis articulation.
- Electronics & Semiconductor: PCB handling and component placement robots where micron-level repeatability is mandatory.
- Food & Beverage: Hygienic pick-and-place and packaging lines using Motoman robots in washdown environments.
- Metal Fabrication: Plasma cutting and grinding robots with continuous wrist-bend motion demands.
- Logistics & Warehousing: Palletizing and depalletizing systems with high-frequency B-axis cycling.
- General Industrial Automation: Any Motoman 6-axis robot platform utilizing the HW9381633-A B-axis reducer assembly.
System Integration & Compatible Parts
The HW9381633-A is designed to integrate seamlessly within YASKAWA Motoman robot wrist assemblies. When replacing this reducer, consider sourcing the following complementary components to ensure a complete and reliable repair:
- YASKAWA Motoman B-axis servo motor (matched torque class)
- Wrist housing seals and O-ring kits
- YASKAWA-approved reducer grease (e.g., Harmonic Grease SK-1A or equivalent OEM lubricant)
- B-axis encoder cable assembly
- Robot controller (DX200 / YRC1000 series) — for system-level diagnostics
Contact our technical team for a complete BOM recommendation tailored to your specific Motoman robot model and serial number.
Our Quality Assurance Process
At Konmask.com, every YASKAWA component undergoes a structured verification process before shipment:
- Source Verification: Parts are sourced from authorized distributors, OEM surplus channels, or certified refurbishment partners.
- Visual & Dimensional Inspection: Each unit is inspected for housing integrity, shaft condition, seal status, and part number label authenticity.
- Functional Testing (Refurbished Units): Refurbished reducers are bench-tested for smooth rotation, absence of abnormal noise, and backlash within OEM tolerance.
- Secure Packaging: Anti-static, moisture-resistant packaging with foam cushioning protects precision gear surfaces during international transit.
- Documentation: Shipment includes inspection report, part number confirmation, and warranty certificate where applicable.
How to Order
- Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your robot model, serial number, and required quantity.
- Receive a Quote: Our team will respond within 1 business day with pricing, lead time, and available condition options.
- Confirm & Pay: We accept T/T bank transfer, PayPal, and other B2B payment methods. Proforma invoice provided upon order confirmation.
- Shipment & Tracking: Parts ship via DHL, FedEx, or UPS Express with full tracking. Export documentation (commercial invoice, packing list) included.
- After-Sales Support: Our engineers are available post-installation for technical guidance and warranty claims.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, servo, and robot components — not a general electronics marketplace.
- Global B2B Supply: Serving MRO buyers, system integrators, and OEM repair centers across 30+ countries.
- Fast Sourcing Network: Access to extensive YASKAWA parts inventory through our verified supplier network.
- Technical Expertise: Our team includes engineers with hands-on experience in Motoman robot maintenance and commissioning.
- Transparent Process: No hidden fees. Clear lead times. Honest condition grading (New / Refurbished / Tested Used).
- Responsive Communication: Dedicated account managers for B2B clients with volume requirements.
Frequently Asked Questions
Q: Is the HW9381633-A compatible with all Motoman robot models?
A: The HW9381633-A is specific to certain Motoman robot models that use this B-axis reducer assembly. Please provide your robot model number and serial number when inquiring so we can confirm compatibility before shipment.
Q: Do you supply new OEM parts or refurbished units?
A: We supply both. New OEM parts are sourced from authorized channels. Refurbished units are fully inspected and tested. The condition will be clearly stated in your quotation.
Q: What is the lead time for the HW9381633-A?
A: Lead time depends on current stock availability. In-stock units typically ship within 2–3 business days. Out-of-stock items are sourced within 5–15 business days. Contact us for real-time availability.
Q: Can you provide export documentation for customs clearance?
A: Yes. We provide a commercial invoice, packing list, and certificate of origin upon request. We have extensive experience with cross-border shipments to the EU, Southeast Asia, Middle East, and the Americas.
Q: What warranty do you offer?
A: New OEM parts carry the manufacturer’s standard warranty. Refurbished units carry a Konmask.com workmanship warranty. Terms are specified in the quotation.
Q: How do I know if my B-axis reducer needs replacement?
A: Common symptoms include abnormal noise from the B-axis joint, increased backlash detected during robot calibration, servo overload alarms on the B-axis, or visible oil leakage from the wrist housing. Our engineers can assist with remote diagnosis.
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Contact: support@konmask.com | +0086 19859288691
