Place of Origin:
China
Brand Name:
Komatsu
Model Number:
3973228
Gear-driven diesel fuel injection pump assembly for the Komatsu PC300-8, PC300LC-8, PC350-8, PC350LC-8 excavators and the WA430-6 wheel loader, powered by the SAA6D114E-3 (6D114) engine. Supplied bench tested with a serial-linked test record, shaft locked and ports sealed for transport.
| Product Name | Diesel fuel injection pump assembly |
|---|---|
| Primary Figure | 6745-71-1170 |
| Same Block Variants | 6745-71-1180, 6745-71-1150, 6745-71-1070 |
| Engine Maker Cross | 3973228, 4954200, 4921431, 2872545, 5594766, 84493585 |
| Engine | SAA6D114E-3, also written 6D114 |
| Machine Programmes | PC300-8, PC300LC-8, PC350-8, PC350LC-8, and the wheel loader WA430-6 |
| Neighbouring Blocks | 6743 group on the earlier generation and 6746 group on the later one |
| Drive | Gear driven from the front train, keyed coupling |
| Delivery | Bench tested, record kept against the pump serial |
| Packing | Shaft locked, ports sealed, crate braced against shock |
| Three Decades, Three Blocks | The opening four digits track the generation rather than the machine, so the same excavator name points at three unrelated pumps depending on which year it left the line. |
|---|---|
| The Later Block Is Quoted Most | Because the newest generation is the one still working in fleets, its figures dominate search results and crowd out the block that this machine actually needs. |
| Four Inside One Block | The variants differ by governor spring and by the position of the delivery fittings, so an exchange between them runs but will not hold the same no-load speed. |
| Two Languages For One Part | Half the trade quotes the machine maker's figure and half quotes the engine maker's, and neither side recognises the other number without a conversion sheet. |
| Pump Or Feed Pump | Listings describe the same figure as both an injection pump and a supply pump, and the two sit at opposite ends of the fuel circuit, so the photograph on the plate decides. |
| Wheels And Tracks | The wheel loader programme uses the same body, which is why a buyer looking for a loader part keeps landing on excavator listings. |
| Caution – Earlier Generation Fits | The previous block bolts straight on and starts, then delivers a curve set for a different rating, and the machine feels flat without ever throwing a code. |
| Caution – Coupling Keyway | A worn keyway lets timing drift by a few degrees under load, which reads as a fuelling fault and survives two pump swaps. |
| Caution – Water And Grit | The plunger pairs run on clearances finer than a human hair, so a filter housing left unchanged will destroy a bench-set pump within a week. |
| Caution – Suction Air | A perished primer diaphragm pulls air instead of fuel, and the resulting surge is regularly blamed on the pump. |
| Related Components | Coupling and key, filter head, hand primer, delivery valves, gasket set, fuel lines, overflow valve. |
From the engine plate, because the machine name spans three generations.
They mount alike and run, but the governed speed will not stay where it was set.
Because the machine side and the engine side each keep their own catalogue.
Listings use both words, so the plate should be checked before ordering.
Only with the coupling pinned and marked first.
An unchanged filter housing and a perished primer diaphragm.
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