9180731 9181123 final drive for Hitachi ZX120-6 midi excavator
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+86 189 289...
+86 189 2896 5241
China
Romania, Maramures
Product Overview
When a Hitachi ZX120‑6 stops moving, the problem is almost never the engine — it is the final drive, the hydraulic motor and planetary gearbox assembly at each track that converts hydraulic flow into sprocket torque. The ZX120‑6 is a 12‑ton machine in heavy demand on utility trenching, site prep and small‑scale earthmoving, and its final drives work hard: pushing through mud, climbing curbs and ramps, and carrying the machine across rough ground all day. Because each final drive supports half the machine's weight while absorbing constant shock from track links, stones and uneven terrain, internal wear shows up as one side crawling slower, the machine pulling to one side on level ground, a hot or noisy track motor, and eventually a track that simply will not pull. This OEM‑grade final drive, referenced by part numbers 9180731 and 9181123, is built to the original specification so a worn unit can be exchanged directly — motor, gearbox and output shaft matched as one assembly — and the ZX120‑6 gets moving again.
Core Advantages
1. OEM‑grade output torque for a 12‑ton utility machine
The ZX120‑6 spends its day on uneven, muddy and sloped ground. Hardened gears and piston surfaces hold the torque the tracks need to push and climb, so the machine does not bog down or slow when the going gets soft.
2. Sealed to keep site contamination out
Final drives work in mud, water and fine dust. Correct sealing at the output shaft and housing joints keeps grit out of the motor and gearbox — the single most important factor in a long final‑drive life.
3. Precision gear meshing for quiet, even running
Planetary gears cut to tight tolerances with controlled backlash run smoothly and evenly. No clicking, no grinding note — just the clean, quiet operation that tells you the gears are sharing load rather than hammering each other.
4. A complete, matched assembly for fast turnaround
Supplied as one motor‑and‑reducer unit, the final drive bolts straight into the original mounting position. No mixing and matching separate parts — the whole assembly exchanges, which matters when a machine that cannot move is costing money every hour.
5. OEM‑grade quality at a practical repair cost
Renewing the final drive to OEM specification restores the ZX120‑6's mobility far below the price of a dealer exchange unit, with sample and batch supply for workshops maintaining several of these machines.
Manufacturing & Quality Control
The OEM‑grade route follows controlled specifications: material certification, precision gear and housing machining, heat treatment of wear surfaces and clean assembly. Each final drive is bench‑tested for output torque, leakage and running noise before release, and only passing units are packed. Full preservation treatment and shock‑absorbing export packing protect the assembly during long‑distance transport.
Frequently Asked Questions
Q1: How do I confirm which part number suits my ZX120‑6?
A: Check the tag on your existing final drive against 9180731 or 9181123 and share your machine serial number. Build variants can differ, so we verify before dispatch.
Q2: Is this the complete final drive assembly?
A: Yes — it is the full hydraulic motor and planetary reducer unit, ready to bolt on as one piece. If you need the motor or gearbox separately, please ask and we will confirm availability.
Q3: What faults point to final drive wear?
A: Uneven track speed, pulling to one side on level ground, a hot or noisy track motor, and tracks that fail to pull under load. Inspect before contamination spreads through the travel circuit.
Q4: What is the warranty coverage?
A: Manufacturing and material defects are covered. Damage from contaminated oil, foreign objects in the travel circuit, track obstruction, overload operation or incorrect installation is excluded; please follow the Hitachi service manual for fitting and bleeding.