SKU: NXB-KIT-762-001 | Version: 1.0 | Brand: NexBot Robotics
The NexBot Robotics 762-001 Joint Overhaul Kit provides all essential components required to perform scheduled preventative maintenance on the high-load J2 and J3 axes of R-50 and R-100 series articulated robots. This comprehensive kit is designed for facilities technicians and certified service engineers to restore original robot performance, addressing common wear conditions such as increased backlash or positioning inaccuracies that can develop over thousands of operational hours. By bundling all necessary parts under a single SKU, this kit simplifies the procurement process, reduces the risk of ordering incorrect components, and ensures that maintenance procedures can be completed efficiently with minimal downtime. Key benefits include the restoration of motion accuracy and the extension of the robot's operational lifespan. All included components are manufactured to original equipment specifications, guaranteeing perfect fitment and function. The kit is specifically engineered for robots operating in demanding, high-cycle applications like automated welding, machine tending, and palletizing, where consistent performance is critical to production quality. The included high-strength Grade 12.9 fasteners ensure that all mechanical interfaces are secured to the correct torque specifications, maintaining structural integrity under maximum payload conditions. This kit is recommended for service at or before the 8,000 operational hour interval as part of a structured preventative maintenance program. Following the official NexBot Robotics service manual during installation is mandatory to ensure safety and proper function. The use of this kit helps maintain the robot's original repeatability and payload capacity, protecting your automation investment.
Before beginning any work, open the NXB-KIT-762-001 and compare its contents against the included packing list. Verify that all bearings, seals, O-rings, fasteners, and lubricant tubes are present and appear undamaged. Report any discrepancies to NexBot Robotics support immediately.
This kit is intended exclusively for the scheduled overhaul of the J2 (waist) and J3 (shoulder) axes on NexBot R-50 and R-100 series robots. Using these components on other axes or robot models may result in equipment failure and void the warranty. This procedure should only be performed by technicians trained in NexBot robot maintenance.
If the kit will not be used immediately, store it in a clean, dry location with stable temperature. Keep the box sealed to protect the precision bearings and seals from moisture and airborne contaminants. The kit dimensions are 450 x 300 x 200 mm for easy storage.
During disassembly, lay out all parts on a clean surface in the order they were removed. As you prepare to install new parts from the kit, match each new component (e.g., the large cross-roller bearing, the smaller motor bearing, specific seals) to its corresponding old part to ensure correct placement.
New bearings must be installed perfectly square to their housing bores. Never apply installation force to the outer race if installing on a shaft, or to the inner race if installing in a housing. Use a press or a properly sized sleeve that contacts only the race being press-fit to avoid damaging the rolling elements.
When installing new oil seals, apply a thin film of the supplied grease to the seal's outer diameter and the housing bore to ease installation. Ensure the seal is driven in evenly and to the correct depth. An angled or improperly seated seal will fail prematurely.
The grease included in the kit is specifically formulated for the high-pressure environment inside the robot's harmonic drive. When filling the joint, pump grease slowly and steadily. Watch for old, discolored grease to be purged from the relief ports, followed by clean, new grease, which indicates a complete fill.
| Interval | Task | Notes |
|---|---|---|
| Post-Installation (First 40 hours) | Monitor the overhauled joints for any signs of weeping or grease leakage around the new seals. Check the joint housing temperature to ensure it is operating within the normal range. | A slight increase in temperature during the initial break-in period is normal. |
| Weekly | Perform a visual inspection of the J2 and J3 joint areas. Look for any new signs of grease leakage, loose fasteners, or damage to cables. | This can be done quickly during routine operator checks. |
| Quarterly | Listen to the J2 and J3 joints while the robot runs a test cycle at various speeds. Note any new or unusual noises such as whining, clicking, or rumbling. | Use a mechanic's stethoscope for more precise acoustic analysis. |
| Annually | Measure the backlash of the J2 and J3 axes using a dial indicator or the robot controller's diagnostic software. Compare the reading to the 'as-new' specification to track wear over time. | Trending this data helps predict when the next overhaul will be required. |
| Per Service Manual (e.g., 10,000 hours) | Perform the next complete joint overhaul using a new NXB-KIT-762-001. | Adherence to the preventative maintenance schedule is critical for maximizing robot lifespan and uptime. |
| Symptom | Possible Cause | Solution |
|---|---|---|
| Excessive heat at the joint after overhaul. | Too much grease was applied, or a bearing was installed improperly, causing binding. | Stop operation immediately. If recently serviced, purge excess grease via the relief valve. If the problem persists, the joint must be disassembled to inspect bearing alignment. |
| Persistent positioning errors or 'hunting' for position. | The robot's mastering data was not correctly reset for the overhauled axes. | Re-run the complete mastering and calibration procedure for the J2 and J3 axes according to the NexBot service manual. |
| Grinding or clicking noise from the joint. | Contamination entered the joint during assembly, or a bearing was damaged during installation. | The joint must be disassembled for inspection. Clean all components and replace any damaged parts. Ensure a clean work environment is used for reassembly. |
| Grease is leaking from a newly installed seal. | The seal was damaged during installation, installed backwards, or the sealing surface on the shaft has a scratch. | Disassemble the joint to replace the seal. Carefully inspect the shaft for imperfections and polish if necessary. Use a proper seal driver for installation. |
| A bolt has come loose after a few hours of operation. | The bolt was not torqued to specification, or thread-locking compound was not used. | Power down the robot (LOTO). Re-torque all fasteners on the joint housing to the correct specification using a calibrated torque wrench and appropriate thread-locker. |
| The robot gives an 'Excess Torque' or 'Collision' alarm on the overhauled axis at low loads. | A bearing is misaligned, or components are binding due to incorrect assembly. | Do not run the robot. Disassemble the joint and carefully re-check the seating of all bearings and the alignment of all housing components. |
| A new bearing from the kit feels rough or does not spin freely. | The bearing may have been dropped or contaminated prior to installation. | Do not install a suspect bearing. Use another bearing if available, or contact NexBot support to report a potentially defective component from the kit. |
| Parameter | Value | Unit |
|---|---|---|
| Weight | 8.5 | kg |
| Country of Origin | KR | |
| Dimensions | 450 x 300 x 200 mm |