Vehicle Compatibility

• Equipment Brand: Caterpillar

• Part Type: Diesel Fuel Injector

• OE Reference Number: 321-3600

• Engine Model: C6.6

• Equipment Type: Excavator and other Caterpillar equipment

• Additional Reference Numbers: 10R-7938, 320-3800, 2645A753

Potential Equipment Applications

• Caterpillar 320D: Compatibility requires engine and serial number verification.

• Caterpillar 323D: Compatibility requires engine and serial number verification.

• Caterpillar 312D: Compatibility has not been confirmed for part number 321-3600.

Caterpillar's official parts catalog identifies 321-3600 as a fuel injector for the C6.6 engine, but its published compatible-model list does not establish fitment for all three excavator models above.

Compatibility Notes

• Confirm that the engine is C6.6 and that the original injector matches reference number 321-3600.

• Do not assume that all 320D, 323D or 312D variants use the same injector.

• Verify the machine serial number and engine configuration before ordering.

• Reference numbers must be checked against the original part and equipment parts catalog.

FAQ

Q1: Which engine uses fuel injector 321-3600?

Part number 321-3600 is listed for Caterpillar C6.6 engines.

Q2: Is injector 321-3600 compatible with the CAT 320D?

Compatibility depends on the engine configuration and machine serial number. Confirm the original injector part number before ordering.

Q3: Is injector 321-3600 compatible with the CAT 323D?

Some aftermarket application information associates this part with C6.6 applications, but exact machine compatibility should be verified.

Q4: Is injector 321-3600 compatible with the CAT 312D?

Compatibility has not been confirmed. Check the engine model and original injector reference number.

Q5: What reference numbers are associated with 321-3600?

Related catalog references include 10R-7938, 320-3800 and 2645A753. Verify interchangeability before replacement.