20Y-27-00500 final drive for Komatsu PC200-8EO PC200-8 midi excavator
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Product Overview
Walk onto almost any earthmoving site in the world and a Komatsu PC200‑8 is somewhere on it — the 20‑ton class benchmark, built in such numbers that its parts have become a language of their own. The EO badge marks the fuel‑savvy variant, but both versions share the same undercarriage: an axial piston travel motor and planetary reduction box, references 20Y‑27‑00500 and 708‑8F‑00250, tucked into each track frame. That pair takes high‑pressure flow from the main pump and trades speed for the low‑speed torque needed to crawl the machine across muddy cut slopes. On a PC200‑8 that has logged real hours, the drive gives itself away gradually — a lazy track on the pull back up the ramp, a warmth through the track frame that was not there last month, a faint whine that rises with revs. Leave it and the piston scores metal into the oil, and that swarf then does the motor's next set of wear for it. This OEM‑grade unit arrives as one complete, bench‑run assembly, matching both the standard PC200‑8 and the EO variant, so the old drive lifts out and the new one drops straight in.
Core Advantages
1. The world's most common 20‑ton drive, built to match
Because the PC200‑8 sold in such volumes, the drive's clearances, porting and mounting are well documented. This OEM‑grade unit follows those drawings rather than approximating them.
2. Straight tracking on long haul roads
A lapped piston block and valve plate hold pressure without internal slip, so both tracks pull the same on a grade. The operator stops fighting a machine that wanders to one side.
3. Gears that keep their manners over years
Ground, hardened planetary teeth mesh with controlled backlash — no early rattle, no harshening whine. The reducer stays civilised as hours pile up on pipelines and road jobs.
4. Sealed for mud season and dust season alike
Whether the site is wet clay or quarry dust, fresh shaft and housing seals keep the bad stuff out of the lube. That is the line between a drive that reaches its first rebuild and one that does not.
5. Drop‑in fit, same afternoon
Flange, studs and ports match the original, so the service crew swaps the whole drive rather than assembling it on the floor. A parked PC200‑8 is a parked earner.
Manufacturing & Quality Control
Parts are machined to Komatsu print, heat‑treated at wear points, and built in a clean shop. Each finished unit runs on a hydraulic stand while torque, leakage and noise are logged; anything off the numbers comes apart for rework. Before crating, internals are fogged with preservation oil, ports are plugged, and the unit sits on dunnage for sea and road freight.
Frequently Asked Questions
Q1: Does this fit both the PC200‑8 and the EO version?
A: The references cover both builds. Send the machine serial number and any tag from your old drive and we confirm before dispatch.
Q2: Do I reuse the sprocket?
A: Usually yes — the sprocket transfers over from the old drive. If yours is hooked, ask about a replacement at the same time.
Q3: What break‑in does the operator need?
A: Take the first shift easy on loaded grades. Light, cycling use seats the new gears and seals before the machine goes back to full digging.
Q4: What's excluded from cover?
A: Materials and build defects are covered. Dirty oil, debris in the motor, a stalled track forced into movement, overload or a botched install are not. Keep arrival photos for any claim.