The Tomoe Engineering Centrifuge Sun Gear Part no: W-X59889B-320#-ESA00 (technical reference GEAR,SUN,B PR07A132A, Drawing Reference Drawing no 320 / Customer request: Sun Gear B PR07A132A, P/N: W-X59889B-320#-ESA) is an authentic, high-precision OEM replacement transmission component engineered and manufactured directly by Tomoe Engineering Co., Ltd. (Japan). Located at the center of the planetary differential gearbox assembly, this sun gear plays a critical role in establishing precise differential gear reduction ratios and managing torque transfer between the centrifuge bowl and the internal scroll conveyor.

Fabricated from premium high-tensile alloy steel (Chromium-Molybdenum Alloy Steel per JIS standards), the GEAR,SUN,B PR07A132A undergoes specialized carburizing and case hardening heat treatment followed by precision stress-relief tempering. This metallurgical process produces an exceptionally hard tooth surface layer (58 – 62 HRC) that resists severe abrasive wear, surface contact pitting, and tooth profile deformation, while retaining a tough, resilient core structure capable of absorbing cyclic shock loads during heavy cake dewatering operations.

The involute tooth geometry of the W-X59889B-320#-ESA00 sun gear is precision CNC ground to ultra-tight JIS Class 0/1 accuracy grades (equivalent to DIN/ISO Class 5-6). This precision manufacturing ensures smooth, backlash-controlled meshing with mating planet gears, minimizing thermal build-up, eliminating operational gear noise, and maximizing power transmission efficiency. Manufactured in strict conformity with Tomoe Japan original Drawing no 320, this component guarantees direct interchangeability during planned maintenance turnarounds or complete gearbox overhauls.

• Manufacturer: Tomoe Engineering Co., Ltd. (Japan)
• Product Category: Decanter Centrifuge Precision Gearing & Gearbox Spare Parts
• Part Number (P/N): W-X59889B-320#-ESA00 (Customer reference: W-X59889B-320#-ESA)
• Drawing Description: GEAR,SUN,B PR07A132A (Sun Gear B PR07A132A)
• Engineering Drawing Reference: Drawing no 320 (DWG No. 320)
• Equipment Compatibility: Planetary Differential Gearbox of Tomoe Engineering Industrial Decanter Centrifuges
• Primary Function: Central torque transmission and differential gear ratio generation in planetary drive assemblies
• Manufacturing Process: Precision CNC gear hobbing/grinding and specialized carburizing case hardening (Carburized & Case-Hardened)
• Construction Material: High-grade Chromium-Molybdenum / Nickel-Chromium-Moly Alloy Steel per JIS standards (JIS SCM415 / SCM420 / SNCM)
• Tooth Surface Hardness: 58 – 62 HRC (with high-impact ductile core)
• Gearing Precision Grade: High precision JIS Class 0/1 (equivalent to DIN / ISO Grade 5-6)
• Installation Location: Planetary differential gearbox core assembly
• Standards & Certifications: Japanese Industrial Standards (JIS), ISO 9001, Factory Mill Test Certificate (100% Made in Japan)