Scheduled Maintenance for the NexBot 712-005 Shaft Seal

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Tools Required

• Safety glasses
• Lockout/Tagout kit
• Calibrated torque wrench (1-15 Nm range)
• Hex key set
• Seal puller tool
• Seal installation driver set
• Soft-faced mallet
• Lint-free cloths
• Approved cleaning solvent

Article

This document outlines the standard procedure for the scheduled maintenance and replacement of the NexBot Robotics 712-005 Shaft Seal (SKU: NXB-GEN-712-005). Proper seal integrity is critical for preventing lubricant leakage and protecting internal joint components from dust, debris, and moisture, ensuring the longevity and reliability of the robotic arm.

This procedure applies to the wrist axes (J4, J5, and J6) on compatible NexBot robot models, including certain R-20, C-10, and S-5 series systems.

Schedule

The replacement interval for the NXB-GEN-712-005 shaft seal is not based on a fixed time period but on the robot's operational conditions and inspection findings. NexBot Robotics recommends a visual inspection of the seals during every scheduled preventive maintenance (PM) cycle.

Replace the seal immediately if any of the following conditions are observed:

• Visible lubricant leakage or weeping around the joint.
• Cracking, brittleness, or visible damage to the seal material.
• The seal has become dislodged from its housing.
• The robot is operating in an environment with high levels of airborne particulates or chemical exposure.

Parts Needed

• Primary Part: 1x NXB-GEN-712-005 Shaft Seal
• Consumables:
• Approved robotic joint grease (refer to your specific robot model's service manual for the correct type)
• Isopropyl alcohol or other approved non-residue cleaning solvent
• Lint-free industrial cloths

Procedure

WARNING: Failure to de-energize and lock out the robot can result in severe injury or death. Follow all site-specific safety and Lockout/Tagout (LOTO) procedures before beginning any maintenance work.

Step 1: Prepare the Robot

1. Move the robot to its designated maintenance position. This is typically a position where the joints are relaxed and easily accessible.
2. Power down the robot controller.
3. Perform the full LOTO procedure on the main electrical disconnect for the robot controller.
4. Verify that all stored energy (electrical, pneumatic, hydraulic) has been dissipated.

Step 2: Access the Joint Seal

1. Identify the joint requiring seal replacement (J4, J5, or J6).
2. Carefully remove any protective covers or end-effector tooling that may obstruct access to the joint housing. Keep all fasteners organized for reassembly.
3. Thoroughly clean the exterior of the joint housing to prevent contaminants from entering the joint during the procedure.

Step 3: Remove the Old Seal

1. Carefully insert a dedicated seal puller tool under the lip of the old shaft seal.
2. Leverage the tool against the joint housing to gently pry the seal out. Work your way around the seal to remove it evenly.
3. CAUTION: Do not use a screwdriver or other sharp object that could scratch or gouge the seal bore or the shaft surface. Damage to these surfaces will cause the new seal to fail prematurely.
4. Once the old seal is removed, use a clean, lint-free cloth and an approved solvent to wipe the seal bore and the shaft surface clean. Remove all old lubricant and debris.

Step 4: Inspect the Joint

1. Visually inspect the shaft surface for any scratches, corrosion, or wear grooves. The surface must be smooth to ensure a proper seal.
2. Inspect the seal bore in the housing for any nicks or burrs. If damage is found, it must be carefully dressed with a fine-grit abrasive cloth before proceeding.

Step 5: Install the New Seal (NXB-GEN-712-005)

1. Apply a thin, even film of approved grease to the outer diameter of the new NXB-GEN-712-005 shaft seal.
2. Apply a light coating of the same grease to the sealing lip on the inner diameter.
3. Carefully orient the new seal. The spring-loaded sealing lip must face inward, toward the lubricant it is designed to contain.
4. Place the seal squarely into the bore. Use a seal installation tool or a socket with an outer diameter that matches the seal's outer metal case.
5. Gently and evenly tap the tool with a soft-faced mallet to press the seal into the bore until it is fully seated and flush with the housing face.
6. Wipe away any excess grease from the exterior of the joint.

Step 6: Reassembly

1. Reinstall any joint covers or components that were removed in Step 2.
2. Using a calibrated torque wrench, tighten the cover fasteners to the specified torque value of 8 Nm.
3. Reattach any end-effector tooling that was removed.

Verification

1. Carefully remove all tools from the work area.
2. Reverse the LOTO procedure and restore power to the robot controller.
3. In a manual, low-speed mode, move the serviced joint through its full range of motion several times.
4. Visually inspect the newly installed seal for any signs of lubricant leakage.
5. Listen for any abnormal noises coming from the joint.
6. If no leaks or issues are detected, the robot can be returned to service. Document the maintenance action in the robot's service log.

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