Hitachi 9742788 Swing Motor Planet Gear
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| Tooth Count | 16T |
|---|---|
| Outer Diameter | 66 mm |
| Inner Diameter | 33 mm |
| Height | 50.3 mm |
| Material | Case-Hardened Alloy Steel |
| Application Position | Swing Motor 2nd Stage Planetary |
| Weight | 1.0 kg |
| Package Dimensions | 6.6 × 6.6 × 5.03 cm |
Manufacturer No.
- 9742788
OEM Part No.
- 9742788
- HI 9742788
Engine Part No.
- John Deere 4045HP050
- John Deere 4045HP051
Interchange No.
- 3063956
- 3063957
Fitment Vehicles
- Hitachi EX100-5
- Hitachi EX110-5
- Hitachi EX120-5
- Hitachi EX130H-5
- Hitachi EX135US-5
- Hitachi ZX125W
- Hitachi EX125WD-5
- Hitachi EX135UR-5
- Hitachi EX140US-5
- John Deere 110
- John Deere 120
The 9742788 planetary gear is a critical component within the swing motor reduction unit (second stage planetary) for Hitachi EX-5 series and ZX series hydraulic excavators. Manufactured to OEM specifications for high-load durability and wear resistance in slew drive applications.
Material composition features case-hardened alloy steel with precision ground tooth profiles to ensure proper meshing with sun gear and ring gear. The 16-tooth configuration matches original design parameters for torque transmission in swing motor models such as M2X120. Direct interchange for Hitachi part number 9742788 and John Deere 9742788.
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