Caterpillar · Engine application
CAT 3126 / 3126B Injectors, Pumps & Repair Kits (HEUI)
HEUI injectors and kits for the 3126 family — matched by the stamped number, not the machine model.
The 3126 / 3126B / 3126E is a HEUI engine — it shares the oil-pressure actuation architecture of the C7, and buyers often ask for 3126 and C7 parts in the same message. The systems are related but the injectors are not interchangeable, and the 3126 family itself spans dozens of reference numbers across configurations and emissions generations.
We supply new HEUI injectors, remanufactured pumps and the internal / external seal kits for the family. The only reliable selector is the number on your old unit — the engine name covers several injector builds.
What we supply for this engine
Part numbers listed
| Part no. | Product | Condition | MOQ |
|---|---|---|---|
183-0560 | 183-0560 Diesel Fuel Injector — CAT 3126B (HEUI) | New (reproduction) | 1 pc (factory pack: 6 pcs) |
178-6342 | 178-6342 / 10R-1257 Common Rail Fuel Injector — CAT 3126 / 3126B | New (reproduction) | 1 pc |
10R-8897 | 10R-8897 HEUI High-Pressure Oil Pump — CAT C7 / C9 / 3126 | Remanufactured | 1 box |
3126 internal kit | 3126 / 3126B Injector Internal Repair Kit | New | Please inquire |
3126 external kit | 3126 / 3126B Injector External Repair Kit | New | Please inquire |
183-0560
CAT 3126B (HEUI)
New (reproduction) · Listed for CAT 3126 / 3126B / 3126E (HEUI) — confirm by old unit number
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178-6342
CAT 3126 / 3126B
New (reproduction) · Listed for CAT 3126 / 3126B (as listed on our export store)
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10R-8897
CAT C7 / C9 / 3126
Remanufactured · Listed for CAT C7, C9, 3126 (HEUI) — excavators and haul trucks
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3126 internal kit
3126 / 3126B Injector Internal Repair Kit
New · Listed for CAT 3126 / 3126B / 3126E (HEUI) injectors — kit contents con…
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3126 external kit
3126 / 3126B Injector External Repair Kit
New · Listed for CAT 3126 / 3126B / 3126E (HEUI) injectors — kit contents con…
View partWhere buyers go wrong
Mix-ups we see on this engine
3126 vs C7. Related HEUI architecture, different injectors. Never select a 3126 unit from a common-rail listing, and never a C7 number for a 3126 by engine name.
HEUI vs later 3126 versions. The family spans HEUI and later versions — match the stamped number on the old unit before ordering.
Engine FAQ
Questions buyers ask about the CAT 3126 / 3126B
Is the CAT 3126 a HEUI engine?
Yes — the 3126 / 3126B / 3126E runs HEUI, the same oil-pressure actuation architecture as the C7. Injectors for the two engines are not interchangeable despite the shared system.
Which part numbers do you supply for the 3126?
183-0560 (HEUI injector), 178-6342 / 10R-1257, the 10R-8897 remanufactured pump, and internal / external seal kits. Confirm by the number on your old unit.
Do 3126 and C7 injectors interchange?
No. Buyers often ask for both in one message because the systems are related — but each takes its own injector numbers, selected from the stamped number on the old unit.
Fitment questions go to our technical team · Related reading in the buying guides.
Send the number from your old unit
We confirm the version, supply status and price for the CAT 3126 / 3126B part you need.
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