708-8F-00121 final drive for Komatsu PC220-6 PC230-6 midi excavator
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Product Overview
The PC220‑6 and PC230‑6 are the ‑6 generation Komatsus — late‑1990s, early‑2000s 22‑to‑23‑ton excavators that spent their working lives on subdivisions, pipeline jobs and road projects. Under each track frame sits the axial piston motor and planetary reducer, covered by references 708‑8F‑00121, 708‑8F‑00120, 708‑8F‑00071 and 708‑8F‑00070, that takes pump flow and turns it into the slow, steady pull moving the machine across uneven ground.
On a ‑6 series Komatsu this age, the drive wears down in quiet stages that are easy to dismiss. The operator notices the two tracks no longer quite match on a long straight, that the track shell warms after a shorter trundle than it should, and that a low whine creeps into the circuit under load. Most crews nurse it another week — but by then the piston block and reduction gears are already shedding swarf into the travel oil. This aftermarket unit reproduces the original motor‑and‑reducer pairing as one sealed, bench‑run assembly, covering both the PC220 and PC230, so the worn drive lifts out whole and the new one bolts straight in.
Core Advantages
1. Four references, one matched drive
The four part numbers cover build variants across the PC220 and PC230 run. We confirm the correct unit against your machine serial number, so workshops stocking this drive can support the whole ‑6 range without guessing.
2. Keeps an older Komatsu earning
Original ‑6 series drives grow scarcer as the fleet ages. This aftermarket unit gives owners a path to keep a still‑useful machine on the job rather than writing it off over a dead track.
3. A lapped piston group that holds pressure
The cylinder block, piston shoes and valve plate are finished to close clearance, so oil pressure does not bleed internally. Both tracks pull in step — no drift, no lazy side, no hesitation when the bucket loads up.
4. Hardened gears for decades‑proven duty
The planetary gear set follows a long‑proven Komatsu layout, with case‑hardened teeth that share the drive load evenly. Meshing stays smooth and quiet, and wear from years of track push slows right down.
5. A direct, drop‑in fit
Flange, studs and ports reproduce the original, so removal and refitting follow the old Komatsu manual. No adapters, no fabrication, no guessing.
Manufacturing & Quality Control
Components are machined to the original ‑6 drawing, heat‑treated where wear bites, and assembled in a clean area. Each finished drive runs on a hydraulic stand while torque, leakage and noise are checked; units outside tolerance are reworked before packing. The internals are fogged with preservation oil, ports are plugged, and the unit is crated on dunnage for freight.
Frequently Asked Questions
Q1: Which of the four references suits my machine?
A: Read the tag on your existing drive against the four numbers and send the machine serial number. The references cover build variants across the PC220 and PC230, so we confirm the exact unit before dispatch.
Q2: Is this interchangeable with the later PC200‑7 or PC200‑8?
A: The ‑6, ‑7 and ‑8 generations use related but not always identical drives. Mounting and output spline can differ. Send the serial number and we will tell you honestly whether it crosses over.
Q3: What symptoms mean the drive is tired?
A: Mismatched track speeds, pulling to one side, a warm or noisy track motor, and hesitation under load. Catch it before swarf spreads through the travel circuit.
Q4: Can a home workshop fit this?
A: The swap needs a track‑frame lift and basic hydraulic tools. If you already service undercarriages, it is a straightforward day job; otherwise use a mobile fitter.
Q5: What is the warranty position?
A: Materials and build defects are covered. Damage from dirty oil, debris in the motor, track obstruction, overload or incorrect fitting is excluded. Photograph any arrival damage before uncrating.