Place of Origin:
China
Brand Name:
Komatsu
Model Number:
49T89-03560
This turbocharger assembly serves the Komatsu PC128US-10, PC138US-10 and PC138USLC-10 tight tail swing excavators powered by the SAA4D95LE-6 four-cylinder turbo diesel. Two separate catalogue traditions describe this charger — the machine maker's figure 49T89-03560 (with 170041 quoted alongside) and the charger maker's figures 5291161 and 4309142 — and they share no characters, so the engine code is the single fact that settles which unit a buyer actually needs.
| Product Name | Turbocharger Assembly |
|---|---|
| Machines | PC128US-10, PC138US-10 and PC138USLC-10 |
| Engine | SAA4D95LE-6, four cylinder turbo diesel |
| Published Output | 72.6 kW, certified to an intermediate European step |
| Machine Maker Figures | 49T89-03560, with 170041 quoted alongside |
| Charger Maker Figures | 5291161 and 4309142 |
| Figures Circulating Elsewhere | 49477-02530 and 49477-02600, which belong to a different frame tradition |
| Tail Type | Tight tail swing, the US suffix in the designation |
| Turbo Count | One per engine |
| Packing | Foam cradle, ports plugged, actuator braced |
| Two Traditions, One Machine | One numbering comes from the machine maker and the other from the charger maker, and they share nothing that a buyer could match by eye, so a quotation built on the wrong one describes a different article at a different price. |
|---|---|
| What The Suffix Means | The two letters mark the tight tail version, which turns inside a single carriageway, and its engine bay is packed tighter than the standard machine of the same weight. |
| The Earlier Tight Tail | The dash two and dash eight builds of the same pair ran an entirely different charger with a cast figure beginning with six, so the suffix alone does not protect a buyer. |
| Emissions Step | The engine was certified to an intermediate step rather than the final one, which is why a unit from the last generation of the same family will not run its boost map correctly. |
| Figures That Travel Badly | One pair of numbers appears in a great many listings against these machines even though its frame belongs to a different application, and repetition has made it look authoritative. |
| Related Components | Actuator, cartridge, housing, exhaust gasket, coolant line, oil feed pipe, drain pipe, inlet hose |
Housing Clearance: On the tight tail machine the actuator sits close to the frame, and a unit with the outlet clocked a few degrees off will foul the panel under load rather than at standstill.
Heat Soak: The confined bay traps heat after shutdown, so a turbo left hot with a restricted coolant path cooks its bearing overnight rather than in service.
Filter Loading: A partially loaded filter cuts inlet pressure without setting a fault, and the resulting low boost is blamed on a charger that is working correctly.
Feed Restriction: The feed union hides a screen that loads with carbon over time, and the failure it causes looks like a manufacturing defect to the buyer.
Whichever is stamped on the housing that came off the machine, and the engine code confirms which generation that housing belongs to.
No, and the difference is visible at the actuator mount.
Because sellers copy each other rather than a parts catalogue.
Only by a workshop with the right fixture, never in the field.
One.
A photograph of the plate and of the old housing number.
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