Hitachi HMGE21 9180731 reducer for Hitachi ZX120 ZX120-3 ZX130-3 midi excavator
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+86 199 246...
+86 199 2461 6345
Mexico, Chihuahua
OEM Numbers: 9180731, 9181123, 9180429, 9196238Model: Hitachi HMGE21 (also HMGE21E / HMGE21EA / HMGF21AC)Type: Integrated travel motor + planetary reducer (12–13 ton midi excavator)Weight: ~160–180 kgApplication: Hitachi ZX120 / ZX130‑3 series midi excavators
1. Compatible Hitachi Models
ZX120 / ZX120‑3 / ZX120‑E
ZX130‑3 / ZX130H / ZX130K / ZX130K‑3
ZX135US‑3 / ZX135‑5A (also fits)
2. Part Number Cross Reference
Hitachi OEM: 9180731 (main), 9181123, 9180429, 9196238
Model variants: HMGE21, HMGE21E, HMGE21EA, HMGF21AC
Alternate: 9289616 (ZX135)
3. Key Specifications (HMGE21 series)
Max output torque: ~8,500 N·m
Max pressure: 31.5 MPa
Displacement: ~2,100 cm³/rev
Mounting: Frame 14‑bolt, sprocket 16‑bolt
Two‑speed: High/low (rabbit/turtle)
Gear ratio: ~45:1
4. Features
Genuine Hitachi hydraulic motor + heavy‑duty planetary gears
Integrated design, high torque for 12–13 ton midi excavators
Exact bolt pattern & port layout, 1:1 direct fit
Factory prefilled gear oil, ready for installation
Durable sealed design for heavy‑duty construction use
Fits left & right sides (identical)
5. Supply & Warranty
Stock in Guangzhou, ship in 1–3 working days
Condition: New OEM / aftermarket equivalent
Warranty: 12 months
Packing: Export wooden crate
6. FAQ
Q: What’s the difference between 9180731 and 9181123?A: Both are HMGE21; 9180731 is standard ZX120, 9181123 is reinforced for ZX130‑3.
Q: Does it replace older HMGE17 / HMGE19?A: No—HMGE21 is larger, higher torque for 12–13 ton (vs 10 ton for HMGE17/19).
Q: Can you verify with my machine serial number?A: Send serial number for free fitment check.