Caterpillar original  173-9267 Fuel Injector for 3126 3126B 3126E Diesel Engine, Replacement for OEM Excavator Spare Part 191-3005 10R-1262 new original new injector

The Caterpillar CAT 3126 HEUI Diesel Fuel Injector 173-9267 is an OEM-style replacement designed for Caterpillar 3126, 3126B, and 3126E diesel engines. Built around the HEUI (Hydraulic Electronic Unit Injection) system, it uses high-pressure engine oil combined with ECM electronic control to deliver precise fuel metering and optimized spray performance. The heavy-duty material construction ensures long service life in demanding commercial and industrial environments, and the injector is available as a single replacement unit or as a full set of six for complete engine service.

This injector supports a wide range of cross-reference numbers including 173-9267, 173-9268, 222-5967, 0R-9349, 10R-9238, 10R-8999, EX639349, 169-7411, 126-0499, 131-7150, 164-3355, 173-4059, 196-1401, 218-4109, 0R-4349, and 31-7150, allowing distributors and fleet operators to source it under multiple part references. It is suitable for medium-duty trucks, commercial buses, diesel RVs, construction equipment, industrial engines, generator sets, agricultural support equipment, and marine auxiliary applications. Multiple supply conditions—new aftermarket, remanufactured, rebuilt, and original type—give buyers flexible options for repair, rebuilding, and distribution needs.

Because the CAT 3126 HEUI system relies on engine oil pressure to actuate injection, proper maintenance is critical. Operators should use clean diesel fuel, replace the fuel filter regularly, maintain correct engine oil quality, replace the oil filter, drain the water separator, inspect the injector wiring harness, keep the valve cover area clean, verify fuel supply pressure, inspect the injection actuation pressure system, perform injector balance testing, monitor exhaust smoke, and handle injector cores properly when purchasing remanufactured units. Common symptoms such as hard starting, rough idle, misfire, black smoke, white smoke, low power, high fuel consumption, fuel dilution, engine knock, injector fault codes, excessive cranking, and uneven exhaust temperature can often be traced to the injector and the HEUI actuation system.