Hitachi HMGC32 9065944 final drive for Hitachi EX220-1 EX220 midi excavator
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Product Overview
The Hitachi EX220 and its early EX220‑1 version are part of a generation of 22‑ton excavators built tough enough to still be earning decades later. Under each track sits the HMGC32 hydraulic motor and planetary reducer — the unit that turns hydraulic flow into the slow, powerful rotation that moves these machines across site. On a legacy machine this age, drive wear comes not from complex failures but from plain accumulated hours: the tracks slowly lose their match, the machine wanders on level ground, a note develops inside the track frame, and eventually a side hesitates under load. Because original parts for early EX machines grow harder to source by the year, an OEM‑grade drive built to the old dimensions is what keeps these workhorses on the job. This unit reproduces the original HMGC32 motor‑and‑reducer pairing as one sealed, tested assembly, so the worn drive can be unbolted and replaced without hunting through dwindling old‑stock channels.
Core Advantages
1. Renews a hard‑to‑source legacy drive
Original HMGC32 drives for early EX220 machines are increasingly scarce. This OEM‑grade unit keeps those decades‑old excavators moving when genuine exchange supply has dried up — a practical lifeline for owners of the last working EX fleet.
2. Pressure‑tight motor internals for even track pull
The piston group, cylinder block and valve plate are finished to close clearances so the motor holds its pressure rather than leaking internally. Both tracks then pull the same — no tug to one side, no wandering on flat ground.
3. Hardened gears built to the old rugged layout
The planetary gear set follows the original tough, simple design, with case‑hardened teeth that share the drive load evenly. No complex electronics to fail — just gears that mesh cleanly and wear slowly.
4. A direct, no‑nonsense fit
The flange, output shaft and porting reproduce the original drive, so removal and refitting follow the old Hitachi service manual. No adapters, no fabrication, no guesswork.
5. OEM‑spec quality at a practical repair cost
Renewing the drive to OEM grade restores the EX220's mobility far below the price of an original exchange unit, with sample and batch supply for workshops keeping legacy Hitachi machines on the books.
Manufacturing & Quality Control
The OEM‑grade route follows controlled specifications: material certification, precision machining of housings and gears, case hardening of wear surfaces and clean assembly. Each completed drive runs on a test rig to verify output torque, internal leakage and running noise before release, and only passing units are packed. Full preservation coating, moisture sealing and shock‑absorbing export casing protect the assembly during transport.
Frequently Asked Questions
Q1: Does this drive fit both the EX220 and EX220‑1?
A: The HMGC32 covers the early EX220 range. Please share your machine serial number so we confirm the exact unit, as early‑build variants can differ.
Q2: Is this the complete motor and reducer?
A: Yes — it covers the full hydraulic motor and planetary reducer as one assembly, ready to bolt on. Separate components can be checked on request.
Q3: What symptoms mean the drive needs attention?
A: Uneven track speed, pulling to one side, a warm or noisy track motor and tracks that hesitate under load. On a legacy machine, catch it before contamination spreads.
Q4: What is the warranty position?
A: Manufacturing and material defects are covered. Damage from contaminated oil, debris in the motor, track obstruction, overload or incorrect installation is excluded — follow the Hitachi service manual for fitting.