OTC DAIHEN FD-V8 Robot Mechanical Structure & Core Parts Analysis
In the OTC DAIHEN automated welding product line, the FD-V8 is a comprehensive upgrade to the classic V6 model. It increases the payload to 8kg, capable of carrying slightly heavier sensor-equipped welding torches or complex handling fixtures while ensuring high-speed motion response. Its lower base (J1-J3 axes) adopts high-strength RV gearboxes (cycloidal gearboxes) to withstand greater load inertia, while the upper arm (J4-J6 axes) integrates precision harmonic gearboxes and high-rigidity crossed roller bearings.
An increased payload means the transmission mechanism will endure more intensive physical wear. Strict assembly precision is required when performing routine robot overhauls (such as replenishing 100-0624 RV grease, calibrating the front-end timing belts, or extracting/replacing the L11700F00 internal bus cable). Please carefully cross-reference the official factory exploded view and the parts list for each axis below for procurement and maintenance. Do not mix motors and belts with other models (such as V6 or B4):
📷 Figure 1: OTC DAIHEN FD-V8 Industrial Robot Complete Mechanical Parts Configuration Diagram
2. FD-V8 Core Parts Reference Table by Axis
For the convenience of the workshop equipment department, we have consolidated the power units, reduction units, and cable accessories of the J1 to J6 axes from scattered tables into a comprehensive global matrix table. Please carefully cross-reference the circled numbers (①-⑱) in Figure 1:
| Axis / Location | Image Ref. | Official Part Number | Standard Part Name | Function & Maintenance Notes |
|---|---|---|---|---|
| J1 Axis (Rotating Base) |
① | W-L02787 | AC Servomotor | Provides main power for wide-range horizontal base rotation. |
| ② | L11130X00 | RV Gearbox | High-rigidity, large-capacity base main reducer. | |
| ③ | 100-0624 | Lubricating Grease | Liquid anti-friction grease dedicated for RV/cycloidal gearboxes. | |
| J2 Axis (Lower Arm Pitch) |
④ | W-L02788 | AC Servomotor | Provides high-torque main power for lower arm forward/backward pitch. |
| ⑤ | L11130Y00 | RV Gearbox | Core reducer bearing the gravity overturning moment of the 8kg arm end payload. | |
| ③ | 100-0624 | Lubricating Grease | Liquid anti-friction grease dedicated for RV/cycloidal gearboxes. | |
| J3 Axis (Upper Arm Pitch) |
① | W-L02787 | AC Servomotor | Provides main power for upper arm up/down pitch (same as J1). |
| 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/cycloidal gearboxes. | |
| J4 Axis (Arm Rotation) |
⑦ | W-L02790 | AC Servomotor | Provides main power for arm axial rotation. |
| ⑧ | W-L01948 | Harmonic Gearbox | Compact flexspline harmonic reducer. | |
| ⑨ | W-L02555 | Crossed Roller Bearing | Precision rotary bearing carrying lateral turnover torque. | |
| ⑩ | 2670-053 | Lubricating Grease | Flexible high-viscosity lubricating grease dedicated for harmonic gearboxes. | |
| ⑪ | 100-1491 | Lubricating Grease | Supplemental anti-friction grease for crossed roller bearing and local applications. | |
| J5 Axis (Wrist Pitch) |
⑫ | W-L02148 | AC Servomotor | Controls the up/down pitch angle of the wrist and front-end fixture. |
| ⑬ | W-L01949 | Harmonic Gearbox | High-precision harmonic reducer for the wrist. | |
| ⑭ | W-L01945 | Timing Belt (J5) | Toothed transmission synchronous belt connecting motor and gearbox. | |
| ⑮ | 100-1516 | Sealant | Original factory high-temperature anaerobic sealant for leakage prevention. | |
| ⑩ | 2670-053 | Lubricating Grease | Dedicated flexspline lubricating grease for harmonic gearboxes. | |
| J6 Axis (Flange Rotation) |
⑫ | W-L02148 | AC Servomotor | Controls the high-torque, high-speed rotation of the end flange. |
| ⑯ | W-L02270 | Harmonic Gearbox | Zero-backlash harmonic drive for end flange. | |
| ⑰ | W-L01946 | Timing Belt (J6) | End axis synchronous toothed transmission belt. | |
| ⑮ | 100-1516 | Sealant | Anti-oil leakage sealant for end cover. | |
| ⑩ | 2670-053 | Lubricating Grease | Dedicated anti-friction grease for end high-frequency friction pair. | |
| Cables & Accessories (Global) |
— | L11700F00 | Cable Assembly (1) | Highly flexible main axis communication cable from the rear of the rack to the upper arm. |
| — | L11750E00 | Cable Assembly (2) | Dedicated flying leads for J5 and J6 axis motors inside the upper arm. | |
| — | L10460B00 | J5, J6 Axis Unit Assembly | Wrist mechanical housing and core component assembly. | |
| ⑱ | W-L01399 | Battery (Encoder) | 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 kits or housing assemblies hidden inside the main body, which cannot be visually indicated in the external skeleton exploded view. Please perform overall extraction and disassembly according to the original factory manual.
💡 FD-V8 8kg Standard Robot Overhaul & Maintenance Red Card Warnings:
- Gearbox Grease Replacement (Forced Pressure Release to Prevent Oil Burst): When injecting new grease (e.g., 100-0624) into the RV gearboxes of the J1-J3 axes on the base and lower arm, you must absolutely open both the inlet and outlet ports simultaneously, and let each axis of the robot run continuously without load at 20%-30% low speed for 30 minutes after injection to thoroughly “release pressure”. If the oil plug is forcibly sealed without fully exhausting the high-pressure air inside the cavity, the rapidly expanding hot air will instantly burst the servo motor’s internal skeleton oil seal, causing massive grease backflow and completely burning out the motor coils.
- Front-End Belt High-Frequency Start-Stop Fatigue: With the FD-V8’s increased wrist payload (8kg), the timing belts of the J5/J6 axes (
W-L01945/W-L01946) endure alternating stresses during high-speed starts and stops that are far greater than previous models. When rebuilding the wrist or replacing belts, never rely solely on manual pressing feeling; a professional sonic tension meter must be used to measure the tension (Hz value). Being too loose will cause terminal positioning drift and belt slipping, while being too tight will directly crack the motor bearings. - Encoder Battery (W-L01399) Live Hot-Swap Rule: The No. ⑱ battery pack located inside the base maintains the spatial absolute position system of the robot’s 6 axes. Never unplug the old battery connector while the main power to the control system is disconnected! Once unplugged during a power outage, all encoder origin memory will instantly clear to zero. When replacing the
W-L01399battery, the control cabinet must remain powered on, and the new battery must be rapidly plugged in immediately after removing the old one.
🛠️ Get Real-Time Quotes for FD-V8 Robot Motors, Gearboxes & Cables
The health of an industrial robot’s “skeleton and transmission system” directly determines the safety of the machining process and the precision of the weld seam. Simply provide the required official part numbers (e.g., W-L02787 Motor, L11130Y00 Gearbox, 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 Cycloidal/Harmonic grease for routine maintenance or original timing belts for a wrist overhaul, feel free to contact us directly: