1 / 2

Hitachi 3103552 Sun Gear

Express Free Shipping

3-Year Factory Warranty

90-Day Hassle-Free Returns

24/7 Dedicated Support

Component Type	Planetary Sun Gear
Applications	Travel Motor Gearbox
Function	Torque Transmission to Planet Gears
Gear Configuration	Planetary Reducer
Tooth Style	Involute
Material	Case-Hardened Alloy Steel
Net Weight	3.5 kg
Package Dimensions	20 × 20 × 15 cm

Manufacturer No.

FD-3103552

OEM Part No.

3103552

Engine Part No.

Isuzu 4HK1
Isuzu 6HK1
John Deere 6068
John Deere 6090

Fitment Vehicles

Hitachi ZX330-3
Hitachi ZX350-3
Hitachi ZX360-3
Hitachi ZX350K-5G
Hitachi ZX350H-3
Hitachi ZX290L-5G
Hitachi ZX350H-5G
Hitachi ZX330LC-3
Hitachi ZX310
John Deere 350DLC
John Deere 350GLC
John Deere 380GLC
John Deere 2154GLC
John Deere 2156GLC

The 3103552 sun gear is a precision-machined component designed for the planetary reduction system within the travel motor gearbox of hydraulic excavators. It functions as the central driving gear meshing with planet gears to transmit torque from the hydraulic motor input shaft to the output carrier, achieving speed reduction and torque multiplication for track propulsion.

Engineered from high-grade alloy steel with case-hardened tooth surfaces, this gear provides high contact fatigue strength and wear resistance under heavy-duty cyclic loading conditions. It is a direct replacement for Hitachi OEM part number 3103552 and fits the travel device assemblies of Zaxis series excavators including ZX330-3, ZX350-3, ZX360-3, ZX350K-5G, ZX350H-3, ZX290L-5G, and ZX350H-5G models powered by Isuzu 4HK1 and 6HK1 engines. Cross-application compatibility extends to John Deere 350DLC, 350GLC, 380GLC, 2154GLC, and 2156GLC excavators equipped with John Deere 6068 and 6090 engines.