Description

• Low Friction & Wear Resistance: The PU outer layer has a friction coefficient of ≤0.15 (against steel guide rails), reducing energy consumption by 15% compared to rubber rollers. It also resists wear—service life is 30% longer than generic PU rollers.

• Shock Absorption: The elastic PU material absorbs vibration from counterweight movement, minimizing noise (≤55dB during operation) and protecting both the roller and guide rails from impact damage.

• Perfect Compatibility: The steel core’s bearing (deep groove ball bearing, model 6204) and mounting dimensions align 100% with Otis counterweight brackets, requiring no modifications to existing hardware.

• Environmental Adaptability: The PU material maintains flexibility in temperatures ranging from -30°C to 80°C, avoiding hardening in cold weather or softening in high temperatures—suitable for elevators in all climates.

1. Pre-Installation Preparation:

• • Execute the Lockout-Tagout (LOTO) procedure: Shut down the elevator’s main power, use a hoist to secure the counterweight (prevent it from sliding), and block the elevator car at a safe floor to avoid accidental movement.

• • Confirm compatibility: Use Nanjing Zhuye Elevator Parts’ free online tool (via their official website) to match the XBA25830G1 with your Otis elevator’s counterweight model and guide rail type.

• • Gather tools: Socket wrench (14mm/17mm), pliers, grease gun (with lithium-based grease), and a feeler gauge (for checking clearance).

2. Removal of Old Guide Roller:

• • Locate the guide roller: Each Otis counterweight typically has 4-6 XBA25830G1 rollers, mounted on the left/right brackets of the counterweight frame.

• • Remove the locking nut: Use the socket wrench to loosen the nut (M16) securing the roller to the bracket, then use pliers to take out the washer and old roller.

• • Inspect the bracket: Check the counterweight bracket for wear or deformation—if there are scratches on the mounting shaft, polish them with fine sandpaper to avoid damaging the new roller’s bearing.

3. Installation of New XBA25830G1 Roller:

• • Prepare the new roller: Apply a thin layer of lithium-based grease (Nanjing Zhuye Elevator Parts recommends ISO VG 220 grease) to the roller’s inner bearing and the bracket’s mounting shaft—this reduces initial friction and extends bearing life.

• • Mount the roller: Slide the new XBA25830G1 roller onto the bracket’s shaft, ensuring the bearing is properly seated. Add the washer and tighten the locking nut to 45-50 N·m (use a torque wrench to avoid over-tightening, which may damage the bearing).

• • Adjust clearance: Use the feeler gauge to check the gap between the roller and guide rail—ideal clearance is 0.5-1mm. If too tight/loose, adjust the bracket’s position slightly.

4. Post-Installation Testing:

• • Remove the counterweight hoist and car blocks, then restore power to the elevator (keep it in maintenance mode).

• • Test movement: Run the elevator car up/down the full shaft 3 times, observing the counterweight through the shaft inspection door—check for:

• • • No abnormal noise (e.g., squeaking, grinding) from the rollers.

• • • The counterweight moves smoothly, with no lateral shaking.

• • • The roller rotates freely (no sticking) when the counterweight is stationary.

• • Troubleshooting: If noise occurs, recheck clearance or grease application; if the roller sticks, replace the bearing (contact Nanjing Zhuye Elevator Parts for replacement bearings).

5. Daily Operation Tips:

• • Facility managers should schedule monthly visual checks: Look for cracks or wear on the roller’s PU layer (via shaft inspection windows) and listen for unusual noises during elevator operation.

• • Every 6 months, maintenance teams should reapply grease to the roller bearings—this prevents dry friction and extends the roller’s service life.

• Normal Use (residential buildings, 8-12 hours daily operation, average load 40% of max capacity): Replacement cycle of 4 to 6 years.

• High-Intensity Use (commercial towers, hospitals, 18-24 hours daily operation, frequent full loads): Replacement cycle shortened to 2.5 to 3.5 years.

• Harsh Environments (elevators in factories with dust, or coastal areas with salt spray—both accelerate PU wear): Replacement cycle of 2 to 3 years.

• PU layer wear: The roller’s outer diameter is reduced by >5mm (measured with a caliper), or there are cracks, peeling, or flat spots on the surface.

• Abnormal noise: Squeaking or grinding sounds from the counterweight area (even after grease application).

• Bearing failure: The roller does not rotate freely, or there is axial play (≥0.3mm) in the bearing.

• Guide rail damage: Scratches or grooves on the guide rail (caused by a worn or misaligned roller).

• Genuine Quality: Each roller uses imported PU material (from Bayer, Germany) and high-precision bearings (from SKF), with a 2-year warranty against manufacturing defects.

• Technical Support: Free installation guides (with photos and videos) and a dedicated team to answer compatibility questions—reducing on-site maintenance time by 40%.

• Fast Global Delivery: Ships to major markets (Europe, North America, Southeast Asia) in 3-5 business days, ensuring minimal elevator downtime for urgent replacements.