The KitchenAid KSM90 is a discontinued Ultra Power 4.5-quart tilt-head stand mixer. Despite being discontinued, it shares the same planetary drive, worm gear, bowl platform, and most electrical components as the current K45SS Classic Series — making repair parts widely available in both OEM and aftermarket. This is a very repairable machine.

✓ Model-Specific Repair Pages

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The KSM90 uses the same worm gear, carbon brushes, speed control board, and 4.5-quart bowl as the current K45SS. Despite being discontinued, all major repair parts remain available. Cross-reference K45SS part numbers for the widest availability on this model.

✓ Common Symptoms Fixed

Grinding noise: Worm gear worn — replace with grease pack.

Shuts off mid-use: Carbon brushes worn — replace both.

Erratic speed: Speed control board failure.

Grease leaking: Full gear + grease service needed.

✓ Key Features & Specifications

Model: KSM90 | Series: Ultra Power | Type: Tilt-Head | Status: Discontinued

Bowl Capacity: 4.5 Quarts | Motor: 300 Watts AC | Speeds: 10

✓ Buying Options

OEM Parts: Original KitchenAid factory parts — exact fit, full manufacturer specifications.

XPart Aftermarket: Premium aftermarket replacements engineered to OEM specifications. XPart aftermarket replacement parts are not affiliated with, sponsored by, or endorsed by KitchenAid or any OEM manufacturer.

✓ Replacement Part Numbers

W10916114 (Worm Gear) | W10490648 (Carbon Brush Set) | W10119326 (Speed Control Board) | W10820039 (Grease Pack) | 9704230 (4.5-Qt Stainless Bowl) | WP9706529 (Flat Beater) | WP9706530 (Dough Hook)

✓ Installation Tips

Unplug before any repair. Access worm gear via the single screw on the back of the head. Clean all old grease before repacking. On older KSM90 units, inspect the head lock mechanism for wear — the locking pin can wear on high-mileage machines.

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