Description
Otis Elevator Door Belt D03000/AT120 Brief Introduction
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Product Name |
Otis Elevator Door Belt |
| Model Number |
D03000/AT120 |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Otis Elevator Door Belt D03000/AT120 – Silent, Strong Motion for Every Door Panel | Nanjing Zhuye Elevator Parts
Behind every whisper-quiet door opening is a belt that never sleeps. The Otis D03000 (standard) and AT120 (heavy-duty) door belts combine aramid cords with a low-noise polyurethane jacket, delivering 0.4 m/s smooth motion and > 3 million cycles life. When the belt frays or stretches, the door jerks, nudges endlessly or stalls open. Nanjing Zhuye Elevator Parts keeps genuine D03000/AT120 belts in climate-controlled storage, cut to OEM length and shipped with factory crimped ends—helping you restore silent motion without costly OEM delays.
Product snapshot
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Otis part numbers D03000 (standard) and AT120 (heavy-duty)
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Construction: aramid (Kevlar) cords, polyurethane jacket, 8 mm wide × 2 mm thick
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Tensile strength 1 200 N (D03000) / 2 000 N (AT120), elongation < 0.3 % at 200 N
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Temperature −30 °C to +80 °C, UV-stable, oil-resistant, low-noise < 45 dB(A)
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Lifetime 3 million cycles, IP55 when used with sealed pulleys
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Compatible with Otis XRDS, Gen2® Life, Gen2® Switch, 4200/5200 side/centre-opening operators
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CE, UL, RoHS, REACH and Otis QES 2024 approved
Where it works
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Side-opening and centre-opening door operators up to 1 400 mm clear width
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Modernisation packages replacing obsolete flat rubber or steel-cable belts
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Any car requiring < 45 dB(A) noise and ±1 mm repeatability
Installation method – 20-minute field swap
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Place lift on inspection mode; open doors manually; switch OFF local breaker; lock & tag.
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Remove operator cover; release belt tensioner; photograph old belt routing.
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Cut old belt; slide out; clean pulleys with iso-propyl alcohol.
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Feed new D03000/AT120 around motor pulley, idler and door pulleys; ensure ribs sit in grooves.
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Set tension: 2 % of centre distance (deflection 6 mm at 300 mm span) using supplied gauge.
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Hand-rotate motor 360°; belt must not touch housing or flanges.
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Power up; run auto-learn via Otis Door Tool (ODT-2.0); 60 s cycle records inertia and friction.
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Execute 50 continuous cycles; verify noise < 45 dB(A) and no fault codes.
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Apply torque-stripe paint; log belt part number, tension and date in maintenance book.
Replacement cycle & preventive maintenance
Otis bulletin SB-BELT-2024-04 recommends:
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Visual inspection every 6 months: check for cracks, frayed cords, oil swelling.
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Tension check every 12 months: deflection > 3 % indicates stretch—re-tension or replace.
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Replace every 3 million cycles or 5 years in high-traffic (> 1 000 starts/day).
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Immediate replacement if:
– cords visible through jacket,
– width < 7.5 mm (wear > 0.5 mm),
– tension drops > 10 % after re-tension,
– noise > 50 dB(A) at 1 m.
Pro tip: 70 % of premature failures are traced to over-tension—keep deflection at 2 % of span.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use sealed pulleys; open slots allow dust to abrade the jacket.
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Never apply belt dressing; it attracts dust and hardens the polyurethane.
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Keep a spare D03000/AT120 in every service van; at 45 g it costs less than one callback.
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After heavy cleaning, run 5 cycles to redistribute jacket coating evenly.
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Order the “Belt Kit” (belt + tension gauge + pulley cleaner) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are an Otis-authorised distributor, importing D03000/AT120 directly from the German foundry, cutting to job length on a laser bed and crimping ends with OEM dies. Every belt is proof-loaded to 500 N and shipped with a 24-month replacement warranty. Our 3 000 m² Nanjing warehouse keeps 5 000 m of each type in stock; orders placed before 14:00 China time leave the same evening via DHL Express, arriving Europe or North America in 2–4 days. Bulk pricing starts at 30 m; we can pre-install end fittings and include a loaner tension gauge to keep your doors moving during the swap.
Conclusion
The D03000/AT120 door belt is the silent muscle that opens every Otis door. By installing the genuine belt, setting correct tension and replacing it before cords appear, you ensure every entrance is silent, every stop is level, and every passenger steps out with a smile. Stock genuine D03000/AT120 from Nanjing Zhuye Elevator Parts today—because when the belt stops, the door stops.
