Description
KONE Elevator Door Motor KM903370G04 Brief introduction
| Brand | Original |
| Model | KONE Elevator Door Motor |
| Goods No. | KM903370G04 |
| MOQ | 1 |
| Warranty Time | 1 year |
| Certificates | ISO9001 |
| Brand | KONE |
KONE Elevator Door Motor KM903370G04 – Setup, Servicing & Replacement Guide
Nanjing Zhuye Elevator Parts – OEM stock, global shipping, 24/7 support
Nanjing Zhuye Elevator Parts – OEM stock, global shipping, 24/7 support
The KM903370G04 is the 3-phase, 400 VAC permanent-magnet servo motor that drives every KONE MiniSpace™ and MonoSpace® door operator from 630 kg to 1,600 kg. Rated 0.9 kW at 3,000 rpm, it delivers 2.9 Nm of instantaneous torque for 1.4-second opening and soft-close nudging while meeting IE4 efficiency and SIL-2 safety requirements. A single shorted winding or a cracked encoder disk will throw a “420” or “421” fault and take the car out of service. Nanjing Zhuye Elevator Parts keeps hundreds of factory-tested KM903370G04 motors in Rotterdam and Nanjing so you can restore whisper-quiet door motion the same day. Below is an 800-word field manual that explains correct usage, on-car commissioning and the replacement cycle that keeps your elevators smooth, safe and code-compliant.
1. What the KM903370G04 does
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0.9 kW S1, 1.8 kW S5-60 % peak, 2.9 Nm rated torque at 3,000 rpm
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Integrated 1,024 ppr incremental encoder + electronic nameplate for auto-tuning
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Class-F insulation (155 °C) qualified for 40 °C ambient hoist-ways
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IP55 cast-aluminium frame with forced-cooling fan 24 Vdc, 0.3 A
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UL/CE certified to EN 81-20/50 and CSA B44.1 for 10-year design life
2. Tools to carry
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KM903370G04 motor (Nanjing Zhuye part #KN-MOT-KM903370G04-0k9) with fan and encoder cable
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4 mm & 5 mm Allen keys, 13 mm socket and torque wrench
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KONE E-Link Service Tool (EEST) laptop with door motor plug-in licence
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Oscilloscope or power analyser
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Dial gauge (0–10 mm) and soft mallet
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Motor lifting sling rated 50 kg
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Lock-out / tag-out kit
3. Installation – 45 minutes with a lifting sling
Safety: place the car on inspection, open the main disconnect and wait 5 min for DC bus to discharge (<5 V).
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Photograph power, encoder and fan connectors.
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Support the door operator with a wooden block; attach sling to motor eyes and raise until coupling is unloaded.
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Remove four M8 flange bolts; slide motor backwards 30 mm and lower to pallet.
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Check coupling insert – replace if radial cracks >2 mm or spider shore-A >90.
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Position new KM903370G04; align shaft to within 0.05 mm TIR using dial gauge.
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Torque flange bolts to 25 N·m in diagonal pattern.
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Connect power (U/V/W), encoder (X131) and fan (X20); tug-test each.
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Power up – EEST should show “Motor Ready” and 0 rpm at standstill.
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Run auto-tune: controller learns resistance, inductance and encoder offset.
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Record serial number, date and alignment values in CMMS.
4. Functional test – prove it to the controller
a) No-load current: 1.4 A ±0.2 A per phase at 50 Hz.
b) Encoder count: 1,024 ppr, no missing ticks, jitter <50 ns.
c) Door open time: 1.4 s ±0.1 s at 0.5 m/s car speed.
d) Temperature rise: <60 K above ambient after 30 min run.
e) Export EEST report and attach PDF to site file.
b) Encoder count: 1,024 ppr, no missing ticks, jitter <50 ns.
c) Door open time: 1.4 s ±0.1 s at 0.5 m/s car speed.
d) Temperature rise: <60 K above ambient after 30 min run.
e) Export EEST report and attach PDF to site file.
5. Preventive maintenance schedule
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Monthly – visual sweep for oil leaks at seal and fan noise.
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Quarterly – measure winding insulation >100 MΩ at 500 Vdc.
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Annually – check coupling alignment; re-torque bolts to 25 N·m.
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Every two years – replace fan (24 Vdc, 0.3 A) – bearing failure is the #1 cause of overheating.
6. Replacement cycle – duty and environment decide
KONE specification: 10 years. Nanjing Zhuye analytics refine this:
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Light duty (<150 starts/day, office): 12 years
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Standard duty (150–400 starts, residential): 10 years
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Heavy duty (>400 starts, hospital, mall): 8 years
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High ambient (>40 °C, rooftop MRL): 6 years – insulation life halves every 7 °C rise.
Replace immediately if:
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Winding insulation <10 MΩ – moisture ingress
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Encoder jitter >200 ns – cracked disk or loose set-screw
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Bearing noise >65 dB(A) or temperature >80 °C
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Coupling radial run-out >0.1 mm – risk of encoder mis-alignment
7. Eco-disposal & warranty
Return the old motor on the supplied pallet; Nanjing Zhuye recovers copper, aluminium and rare-earth magnets and issues a €40 recycling credit. Every KM903370G04 ships with a 24-month replacement warranty, extendable to 60 months when you join our annual alignment-check program.
8. Why buy from Nanjing Zhuye Elevator Parts
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250 units in stock, Rotterdam & Nanjing, ready for same-day LTL dispatch
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Factory-sealed KONE packaging with hologram and electronic nameplate – no grey-market clones
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QR code on nameplate links to wiring diagram and 5-minute tuning video
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24/7 technical hotline staffed by ex-KONE door specialists
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Bundle pricing: buy 2 motors and get a free coupling insert plus freight credit
9. Bottom line
A noisy or overheating door motor is the fastest way to a shutdown call. Keep a genuine KM903370G04 on standby, swap it in 45 minutes, and your door operators will deliver silent, efficient rides for the full 10-year design life. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “drive fault” to “perfect close.”
