CAT 176-1150 Fuel Injector (Injector GP) | Cross-Refs 0R-9803 / 10R-0955 For Caterpillar 3406E, 3406C, 3456, C16 & C18 Engines

Some failures don't announce themselves with a loud bang-they whisper. A slightly longer crank. A faint haze under load. A vibration that comes and goes depending on temperature. On Cat heavy-duty platforms, those "soft symptoms" often trace back to one precision part that lives in a brutal environment of pressure, heat, and vibration: the unit fuel injector. If you're searching 176-1150, you're likely doing what smart fleets do-locking onto the exact part number before downtime turns into a schedule problem.

176-1150 is listed by Cat as an INJECTOR GP (injector group) and is shown as discontinued in the Cat Parts Store, with guidance to contact a dealer for replacement options. Because of that discontinuation, the aftermarket and reman channels are where most buyers now compare options, and you'll see 176-1150 sold alongside well-known interchange numbers such as 0R-9803 and 10R-0955.

In practical terms, 176-1150 is an injector assembly used on multiple Caterpillar engine families. Its job isn't merely "delivering fuel"-it controls how cleanly and consistently combustion happens, cycle after cycle.

When an injector drifts (wear, deposit build-up, leakage, response lag), the engine can still run, but it becomes less predictable:

◆ harder starts (especially after heat soak)
◆ rough idle or intermittent miss
◆ smoke under load / sluggish response
◆ higher fuel use (drivers compensate without realizing)

Replacing the correct injector restores cylinder balance-that "smooth pull" feeling fleets associate with a healthy engine.

 

Across multiple parts listings, 176-1150 / 0R-9803 / 10R-0955 is commonly marketed for these Caterpillar engines and equipment families:

CAT 3406E (very frequently stated in listings)

CAT 3406C and CAT 3456 (often grouped with the same injector set)

CAT C16 / C18 (commonly associated with reman/rebuilt injector references)

Equipment/application examples appear in seller catalogs, such as 621G / 623G / 627G tractors/scrapers when describing the injector fitment group.

Best practice: match the injector by part number on the old injector (176-1150 / 0R-9803 / 10R-0955) and verify engine serial/application before ordering. Sellers repeatedly warn that part-number matching matters more than "model only."

If you want to capture search traffic and reduce wrong orders, list the common interchange numbers clearly:

176-1150 (Cat Injector GP)

0R-9803 (0R9803)

10R-0955 (10R0955)

Often bundled in reman listings with 191-3005 and 211-3025

Reman/rebuilt reference examples: 10R0955DR (sold as rebuilt injector fitting C16/C18 and listing 176-1150/0R9803 in the reference chain)

 

 

Because Cat lists 176-1150 as discontinued, buyers typically compare three routes:

🆕 Aftermarket new
Often marketed for 3406E under 176-1150 / 0R-9803 with warranty terms like 6 months depending on supplier.

♻️ Remanufactured / rebuilt
Common for C16/C18 channels, sometimes advertised with no core deposit and 6-month warranty from certain sellers, while other listings use core/exchange language.

🏷️ Genuine vs. mixed sets
Some catalogs caution that mixing genuine and aftermarket injectors can create output/atomization differences-fleet practice typically prefers matched sets to keep cylinder balance tight.

 

To protect a new injector and prevent repeat failures:

✓ Replace fuel filters and drain water separators
✓ Inspect fuel for contamination (metal/water) before installing injectors
✓ Keep injectors as a matched set when possible (especially on high-hour engines)
✓ Recheck for leaks after the first heat cycle

 

 

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