OTC DAIHEN FD-V6 Robot Mechanical Structure & Core Parts Analysis
In the OTC DAIHEN automated arc welding workstation, the FD-V6 is an extremely classic standard industrial robot with a 6kg payload. Thanks to its excellent trajectory accuracy and reliable mechanical rigidity, it is widely used in various MIG/MAG/TIG welding scenarios for carbon steel, aluminum alloy, and stainless steel. Its lower base (J1-J3 axes) utilizes high-load RV gearboxes, while the upper arm (J4-J6 axes) integrates miniature and lightweight harmonic gearboxes.
After tens of thousands of hours of high-frequency spatial interpolation and reciprocating movements, the dedicated lubricating grease inside the gearboxes of each axis (such as 100-0624, 2670-053, etc.) will carbonize and dry out, and the timing belts will also experience elongation. When performing routine major robot maintenance, replacing servo motors, or replacing internal cable packages, please strictly follow the official factory exploded view and the parts list for each axis below. Never mix different models of grease:
📷 Figure 1: OTC DAIHEN FD-V6 Industrial Robot Complete Mechanical Parts Configuration Diagram
2. FD-V6 Core Parts Reference Table by Axis
For the convenience of workshop maintenance personnel, we have consolidated the power units, reduction units, and cable accessories for axes J1 through J6 from scattered lists into a comprehensive global matrix table. Please carefully cross-reference the circled numbers in Figure 1:
| Axis / Location | Image Ref. | Official Part Number | Standard Part Name | Function & Maintenance Notes |
|---|---|---|---|---|
| J1 Axis (Rotating Base) |
① | W-L02662 | AC Servomotor | Provides main power for horizontal base rotation with large inertia. |
| ② | L11130X00 | RV Gearbox | High-rigidity heavy-duty base reducer. | |
| ③ | 100-0624 | Lubricating Grease | Liquid anti-friction grease dedicated for RV gearboxes. | |
| J2 Axis (Lower Arm Pitch) |
④ | W-L02641 | AC Servomotor | Provides main power for lower arm forward/backward pitch. |
| ⑤ | L11130Y00 | RV Gearbox | Reducer bearing the gravity overturning moment of the main lower arm. | |
| ③ | 100-0624 | Lubricating Grease | Liquid anti-friction grease dedicated for RV gearboxes. | |
| J3 Axis (Upper Arm Pitch) |
① | W-L02662 | AC Servomotor | Provides main power for upper arm up/down pitch angle. |
| ⑥ | L11130Z00 | RV Gearbox | Heavy-duty reducer driving the extension of the upper arm. | |
| ③ | 100-0624 | Lubricating Grease | Liquid anti-friction grease dedicated for RV gearboxes. | |
| J4 Axis (Arm Rotation) |
⑦ | W-L02148 | AC Servomotor | Provides main power for upper arm axial rotation. |
| ⑧ | W-L01948 | Harmonic Gearbox | Compact flexspline harmonic reducer. | |
| ⑨ | W-L02555 | Crossed Roller Bearing | Precision bearing carrying arm lateral turnover torque. | |
| ⑩ | 2670-053 | Lubricating Grease | Flexible lubricating grease dedicated for harmonic gearboxes. | |
| ⑪ | 100-1491 | Lubricating Grease | Supplemental grease for crossed roller bearing or gear cavity. | |
| J5 Axis (Wrist Pitch) |
⑦ | W-L02148 | AC Servomotor | Controls the up/down pitch angle of the welding torch. |
| ⑫ | W-L01949 | Harmonic Gearbox | High-precision harmonic reducer for the wrist. | |
| ⑬ | W-L01945 | Timing Belt (J5) | Toothed transmission synchronous belt connecting motor and gearbox. | |
| ⑭ | 100-1516 | Sealant | Original factory anaerobic sealant for leakage prevention. | |
| ⑩ | 2670-053 | Lubricating Grease | Dedicated lubricating grease for harmonic gearboxes. | |
| J6 Axis (Flange Rotation) |
⑦ | W-L02148 | AC Servomotor | Controls the high-speed rotation of the end welding torch flange. |
| ⑮ | W-L02270 | Harmonic Gearbox | Zero-backlash harmonic reducer for the end flange. | |
| ⑯ | W-L01946 | Timing Belt (J6) | End axis toothed transmission synchronous belt. | |
| ⑭ | 100-1516 | Sealant | Original factory anaerobic sealant for leakage prevention. | |
| ⑩ | 2670-053 | Lubricating Grease | Dedicated lubricating grease for harmonic gearboxes. | |
| Cables & Accessories (Global) |
— | L11130F00 | Cable Assembly (1) | Highly flexible main axis wiring harness from the rear of the rack to the upper arm. |
| — | L10460G00 | Cable Assembly (2) | Dedicated flying leads for J5 and J6 axis motors inside the upper arm. | |
| — | L10460B00 | J5, J6 Axis Unit | J5/J6 wrist mechanical housing assembly. | |
| ⑰ | W-L01399 | Battery (Absolute) | Backup lithium battery pack maintaining the mechanical zero coordinates of the encoders. |
* Note: Items with an “Image Ref.” of “—” in the table represent wiring harness components hidden inside the main body, which cannot be visually indicated in the external skeleton exploded view. Please perform disassembly and replacement according to the original factory manual.
💡 FD-V6 Robot Mechanical Overhaul & Maintenance Red Card Warnings:
- Grease Replacement Differences between RV and Harmonic Gearboxes (Pressure Release Process): Due to their different mechanical structures, the RV gearboxes on axes J1-J3 and the harmonic gearboxes on axes J4-J6 must never use mixed lubricating grease. When injecting new grease (e.g., 100-0624) into the RV gearboxes, you must absolutely open both the inlet and outlet ports simultaneously, and let each axis of the robot run continuously at 30% low speed for over 20 minutes after injection to thoroughly “release pressure”. If the oil plug is sealed without fully exhausting the high-pressure air inside the cavity, the rapidly expanding air during operation will instantly burst the servo motor’s internal skeleton oil seal, causing massive grease backflow and completely burning out the AC servo motor.
- Fatigue and Tension of J5/J6 Timing Belts (W-L01945/46): When the FD-V6 executes high-frequency short-seam corner welding, the end transmission belts are highly susceptible to fatigue stretching due to alternating stress. If the belt tension is too loose during maintenance, “tooth jumping” is highly likely to occur, causing the welding torch TCP to instantly deviate severely; if the tension is too tight, it will crush the miniature bearings of the motor spindle. When replacing belts, a professional sonic tension meter must be used to accurately adjust them to the Hz frequency baseline specified in the official maintenance manual.
- Absolute Battery (W-L01399) Live Hot-Swap Rule: The backup battery located inside the base maintains the spatial absolute position memory of the robot’s 6 axes. Never unplug the old battery while the main power to the control system is disconnected! Once unplugged during a power outage, all encoder origin coordinate parameters will instantly clear to zero, and the full-axis scales must be recalibrated and the origin positions rewritten. When replacing the
W-L01399battery, the control cabinet must remain powered on, and the new battery must be plugged in immediately after removing the old one.
🛠️ Get Real-Time Quotes for FD-V6 Robot Motors, Gearboxes & Cables
The health of an industrial robot’s “skeleton and muscles” directly determines the trajectory repeatability in space. Simply provide the required official part numbers (e.g., W-L02662 Motor, L11130X00 Gearbox, or W-L01399 Battery), and our automated spare parts system will quickly match and output an accurate, ready-to-ship quote for you. Whether you need original RV/Harmonic grease for routine maintenance or internal highly flexible cable assemblies for a complete overhaul, feel free to contact us directly: