Part Number Z5B366730 refers to the Front Axle Main Reducer and Differential Assembly manufactured by SEM (Shandong Engineering Machinery), a subsidiary of Caterpillar.
**Key Parameters and Interchange Numbers** — Official Part Number: Z5B366730; Caterpillar/SEM Compatible System Number: 5224345.
**Common Gear Specifications:** The ring and pinion gear ratio typically consists of 8/37 teeth (8 teeth on the drive pinion / 37 teeth on the driven ring gear).
**Connection Flange Specifications:** Commonly features a 41-spline configuration with a flange diameter of approximately 165 mm, equipped with 8 mounting holes.
**Applicable Models:** This main reducer assembly is widely compatible with the front axle systems of SEM (Shandong Engineering Machinery) 5-ton and 6-ton series wheel loaders. Common matching models include: SEM 650B, SEM 653D, SEM 655D (including National III emission standard models and various variants), and SEM 656D.
**Associated Front Axle Components:** According to the OEM parts catalog for standard SEM loader front axles (e.g., the S028 axle), this component integrates with the following adjacent core parts to form the complete drive transmission system: Z5B366700 (Front Drive Axle Assembly); Z5B366701 (Front Axle Housing Weldment); B160134180 (O-ring for Main Reducer Mounting Face Seal — Specification: 418 × 3.55); and Z5B366830 (The corresponding Rear Axle Main Reducer and Differential Assembly).