Description

Toshiba elevator guide shoe wheel 70*25*6202 90*30*6202 Brief introduction

1. What 70×25×6202 Really Is

• Outer diameter: 70 mm × 25 mm tread — fits 16–19 mm rail web
• Material: oil-impregnated PU 92 Shore-A on steel hub — coefficient of friction 0.18, self-lubricating
• Bearing: sealed 6202-2RS, 15 mm bore, grease-filled for -30 °C to +80 °C
• Load rating: 3.8 kN static, 1.9 kN dynamic per roller — suits cars up to 1,600 kg
• Temperature range: -25 °C to +70 °C — outdoor scenic lifts included
• Pack unit: 1 roller + 2 circlips + M12 shoulder bolt + 2 mm Allen key

2. Where It Is Used

• Otis Gen2®, Gen2-Life®, SkyRise® 1.0–2.5 m s⁻¹ with PM machines 11–30 kW
• Mitsubishi LEGY, NEXIEZ passenger and scenic lifts
• Thyssen Synergy® Evolution® retrofits
• Chinese MRL controllers with 16–19 mm guide rails
• Suitable for cars and counter-weights up to 1,600 kg

3. Installation – 10-Minute Swap

1. Remove old roller — undo M12 shoulder bolt; slide worn roller off eccentric pin.
2. Inspect pin — if scoring >0.2 mm, polish with 600-grit emery or replace pin.
3. Hand-press new 70 mm roller until circlip seats flush; ensure 0.05–0.10 mm preload on rail.
4. Apply 1 drop of PTFE spray — no grease bath needed; PU is self-lubricating.
5. Tighten bolt — torque 55 N·m; spin by hand — smooth rotation, no lateral play.
6. Run car on inspection — listen for rattling; adjust eccentric until pull force <5 N.

4. Daily Operation – What the Roller Actually Does

• Carries lateral forces from passenger imbalance, wind or earthquake sensors
• Absorbs rail irregularities; reduces car vibration by 8 dB compared with sliding guides
• Oil-impregnated PU releases micro-film, keeping rail polished and rust-free
• Temperature expansion 0.04 mm/°C — no binding in outdoor scenic lifts
• Designed for 3 million cycles at 2.0 m s⁻¹ — equivalent to 15 years in a 600-start/day building

5. Replacement Cycle & Preventive Maintenance

• High-traffic office (>1,000 starts day⁻¹) – inspect every 6 months, replace rollers every 5 years
• Residential tower (300–600 starts day⁻¹) – inspect annually, replace every 8 years
• Low-rise freight (≤200 starts day⁻¹) – inspect every 18 months, replace every 10 years

• Diameter worn below 68 mm (2.8 % reduction)
• Radial play >0.3 mm when 50 N side-load is applied
• Cracks in PU tread >2 mm deep or surface flaking >10 mm²
• Bearing emits >75 dB(A) at 1 m or temperature >65 °C
• Rail scoring visible (>0.1 mm depth) under roller track

6. Extending Life – 3 Pro Tips

1. Keep rail straightness ≤0.5 mm / 5 m; kinked rails eat rollers
2. Wipe rail monthly; brake-dust paste acts like grinding paste
3. Align car and counter-weight rollers on the same rail axis; misalignment doubles roller wear

7. Why Buy 70×25×6202 from Nanjing Zhuye Elevator Parts?

• Factory-new PU 92 Shore-A, not recycled plastic; passes 3-million-cycle wear test
• Steel hub zinc-plated; salt-spray 48 h — no rust in coastal shafts
• Dual stock: 10,000 pcs Nanjing, 3,000 pcs Dubai — next-day to 65 countries
• Bundle kit: roller + circlips + M12 bolt + 2 mm Allen key — 5 % cheaper than single OEM piece
• 24 months warranty against cracking or abnormal wear
• 7×24 WhatsApp/WeChat video support; average response 10 minutes

Conclusion