Product Details
Assembly 4025280 functions as a fully self-contained mechanical unit injector (Cummins labels it "KIT, INJECTOR") engineered for the Cummins QST30 V12 platform (CM552 / CM850 controls, mechanical cam-driven P-class intensification). It integrates the needle valve, DLLA-class multi-orifice tip, bias spring, adjusting screw, and plunger follower into one screw-in body that seats into the QST30 head cup via a 27 mm class flange and Cummins-spec copper washer. Rated crack pressure sits in the 260–280 bar band depending on shim code, with a 155° hollow-cone 6-hole tip (0.30 mm class) tuned for the QST30's high-swirl pre-chamber. Body is nitrided alloy steel, needle seat lapped 60°, spring stack calibrated for continuous 1800–2100 rpm genset duty under +85 °C coolant ambient. Cross-reference aliases: 4025280, 3093283 (alt Cummins etch), Bosch 0 432 191 410, 0432191410.
Video Description
Product Parameters
| Part Number | 4025280 |
| Items |
Fuel Injector |
| Type |
Oil pump, oil nozzle |
| Condition | New |
| Material | 45# steel |
| Compatible Models | Cummins QST30 Series Engine |
| Price | $9.5-$10 |
| Shape | Standard injector shape |
| Working Temp | Adapt to diesel engine normal working temperature |
| Lead Time | 3-10 working days (According to quantity and seasons, the lead time is different) |
| MOQ | 4 PC |
| OEM | Acceptable (customized tag, label, logo) |
| Sample | Available (sent first for quality inspection) |
Our Advantages
Formulated from heat-strengthened premium metal frameworks, this exceptionally accurate fuel control unit maintains uninterrupted fluid transmission and uniform spray atomization amid variable pressure swings and recurring thermal strain cycles. Each fully built mechanism undergoes intense operational adjustments to perfect combustion efficiency, correct intermittent cold-start performance defects, and hinder carbon accumulation within cylinder bore spaces. Optimized internal routing designs improve maximum torque generation, lower fuel usage per operating interval, and suppress toxic exhaust outputs. Configured for straightforward clamp-free assembly and high-productivity field servicing, its resilient strengthened casing suits commercial transport operations, urban engineering diggers, and stationary electrical generation plants. Stringent lot-level quality monitoring ensures consistent build criteria across every export shipment, with specialized purchasing assistance furnished by formally accredited regional supply affiliates.
FAQ
1.Is 4025280 a nozzle tip, a holder, or the whole injector?
Whole injector kit. Unlike the 131-series Bosch tips (0432131628 etc.) or the CAT 212-8470 GP injector discussed earlier, 4025280 is the complete screw-in unit for QST30 - tip, needle, spring, plunger, and body in one. Ordering 4025280 gets you the full cartridge; there is no separate DLLA tip or KDAL-style holder to buy.
2.Can 4025280 drop into a 6BT 5.9L or a 4BT 3.9L VE engine?
No. Different flange diameter (27 mm vs KDAL59P2's 17 mm hex/M14 nose), different cup depth, different spring rate, and 260+ bar vs VE's 205–220 bar. The QST30 injector is a large-frame V12-class unit; forcing it into a 4/6BT head is geometrically impossible without machining the cup away entirely. Match by engine family - 4025280 is QST30-only.
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