Description

Elevator Door Hanger Roller 48×13×6200Z: Usage, Replacement Cycle & Maintenance Guide
By Nanjing Zhuye Elevatorparts

Introduction
The 48×13×6200Z elevator door hanger roller is a precision-engineered component that keeps car and landing doors gliding smoothly along their tracks. Manufactured by Nanjing Zhuyan Elevatorparts, this bearing-equipped roller meets EN 81-20/50 and ASME A17.1 requirements, delivering quiet, low-friction performance for passenger, hospital and high-speed elevators. This 800-word guide covers correct installation, daily maintenance, and the recommended replacement cycle to maximise safety, ride comfort and component life.

—

1. Product Highlights
– Dimensions: Ø48 mm (OD) × 13 mm (thickness) × 6200Z deep-groove ball bearing
– Material: 52100 chrome steel, hardened to HRC 60-65
– Load Rating: 5.1 kN dynamic, 2.4 kN static
– Speed: ≤2.5 m/s, noise <55 dB(A) @ 1 m
– Grease: Lithium low-noise, -40 °C to +120 °C
– Expected Life: 3–5 years or 1.5 million door cycles under normal duty

—

2. Installation Method
Step 1 – Preparation
De-energise the lift; set the car on mechanical safety blocks. Record original roller diameter for comparison.

Step 2 – Removal
Extract split pins and slide worn roller off the hanger shaft. Clean shaft with 70 % IPA and inspect for scoring.

Step 3 – Fit New Roller
Slide 48×13×6200Z onto shaft until flush. Insert retaining washers and new split pins; torque M6 screws to 8 N·m.

Step 4 – Commissioning
Run door at inspection speed (0.3 m/s) for 10 cycles. Check lateral play <0.5 mm, temperature rise <45 °C, no squeaks.

—

3. Daily & Preventive Maintenance
Daily (Building Staff)
Visual check for cracks, missing grease, or unusual noise.

Monthly
Wipe roller and track with lint-free cloth; remove dust and oil build-up.

Quarterly
Measure outer diameter with caliper; record wear rate. Check split-pin tightness and shaft alignment.

Annually
Full dimensional audit and torque re-check. Replace if wear exceeds 0.3 mm or bearing play >0.1 mm.

—

4. Replacement Cycle & Indicators
| Duty Cycle | Replace Every | Cycles | Warning Signs |
| Residential | 5 years | 1.5 M | Diameter <47.7 mm, noise >65 dB |
| Commercial | 3–4 years | 1 M | Blue heat spots, vibration |
| High-speed | 2–3 years | 0.8 M | Bearing play, temperature >60 °C |

Replace immediately if:
– Bearing seizes or grease leakage
– Temperature rise >60 °C during normal run
– Visible cracks in outer race or retainer

Stock one spare set (4 rollers) per 25 elevators for <4-hour response.

—

5. Why Choose Nanjing Zhuye Elevatorparts?
• CNC-machined to ±0.01 mm tolerance, batch-tested to ISO 9001
• Same-day worldwide shipping via DHL/FedEx Express
• 24/7 multilingual hotline and on-site training
• Competitive tiered pricing and custom grease for OEM projects

—

6. Conclusion
The 48×13×6200Z door hanger roller from Nanjing Zhuye Elevatorparts reduces friction, dampens vibration, and extends track life—all in one easy-to-replace component. By following the usage and replacement guidelines above, facility managers and technicians can ensure smooth, quiet rides and full code compliance.