Excavator Engine Parts

5I-7706 Unit Injector Nozzle for Caterpillar S6K 311B 312B 320B 321B

Q: What numbers are documented for 5I-7706?

Primary Equipment Part Number: 5I-7706. Same-number Formatting Variant: 5I7706. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 5I-7706 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

5I-7706 Unit Injector Nozzle for Caterpillar S6K 311B 312B 320B 321B, OEM/reference 5I-7706, Unit Injector Nozzle, product view 1

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OEM / reference5I-7706

SpecificationUnit Injector Nozzle

Catalog ID74031320

Unit injector nozzle identified by Caterpillar part number 5I-7706. The manufacturer product record names the component and lists 311, 311B, 312B, 320, 320B and 321B excavator families; an exact-number application record links the nozzle to the S6K engine. Confirm 5I-7706, the engine arrangement and equipment serial range before ordering.

Product Type: Unit Injector Nozzle
Product Brand: EexcavaStart
Fuel Type: Diesel
Manufacturer-Listed Length: 8.1 in
Manufacturer-Listed Height: 2.1 in
Condition: New replacement part

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Part-number relationships

Relationship	Reference family	Number
Primary Equipment Part Number	Manufacturer-listed injector nozzle number	5I-7706
Same-number Formatting Variant	Compact search format	5I7706

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.

Part identification

Reference numbers

Primary number

5I-7706

Formatting alias

5I7706

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

Unit Injector Nozzle

Category: Excavator Engine Parts
Catalog ID: 74031320
Photo views: 3

Before ordering

Confirm these details

Match the complete part number on the original component.
Compare connectors, mounting points and visible dimensions with the product photos.
Confirm the exact machine or engine model and serial range before ordering.

Machine fitment

Compatible model references

3 model references

Engine family: Caterpillar S6K
Manufacturer-listed machines: Caterpillar 311 / 311B / 312B / 320 / 320B / 321B
Fitment limitation: Confirm 5I-7706, engine arrangement and equipment serial range

Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.

Quick fitment answers

Common questions about 5I-7706

Which machines use 5I-7706?

Recorded compatible model references include Engine family: Caterpillar S6K, Manufacturer-listed machines: Caterpillar 311 / 311B / 312B / 320 / 320B / 321B, Fitment limitation: Confirm 5I-7706, engine arrangement and equipment serial range. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 5I-7706?

Formatting aliases for the same number: 5I7706.

How do I confirm 5I-7706 before ordering?

Match the complete part number on the original component. Compare connectors, mounting points and visible dimensions with the product photos. Confirm the exact machine or engine model and serial range before ordering. Send clear photos of the original unit and connector layout when requesting a quote.

Continue comparing verified references from the same system.

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