4-Piece Fuel Injector Set 517706 — Direct-Fit Replacement for Caterpillar 3064 & 3066 Engines | E312B & E320B Excavators

CAT excavators are built to work hard — and so are the injectors that keep them running. When your Caterpillar E312B or E320B starts showing signs of worn injectors — hard starts, black smoke, sluggish response, or increased fuel consumption — this complete set of four brand-new fuel injectors is the direct-fit solution. Engineered to OEM specifications for the CAT 3064 and 3066 engines, they restore precise fuel delivery and full combustion efficiency so your excavator gets back to work without missing a beat.

Why Choose This Injector Set?

• Complete Set of 4 — Replace all injectors together for balanced combustion, even power delivery across all cylinders, and maximum long-term reliability. No mixing old and new.
• Direct OEM-Equivalent Fit — Engineered to match Caterpillar 3064 (S4KT) and 3066 (S6KT) engine specifications. Drops in without modifications for a fast, professional installation.
• 100% New Aftermarket Parts — Not rebuilt or remanufactured. Full service life from day one, built to handle the continuous heavy-duty demands of excavator operation.
• Restored Fuel Atomization — Precise spray pattern across all cylinders recovers lost digging power, improves fuel efficiency, and eliminates the black smoke caused by poor combustion.
• Verified Cross-Reference Fit — Matches both 517706 and 51-7706 part number formats for easy identification and confident ordering.

Compatible Part Numbers

517706 | 51-7706

Compatible CAT Engines & Equipment

Engines: Caterpillar 3064 (S4KT) | 3066 (S6KT)

Excavators: CAT E312B | CAT E320B

Product Details

• Part Number: 517706 / 51-7706
• Quantity: Set of 4 Injectors
• Condition: 100% New Aftermarket
• Compatible Brand: Caterpillar (CAT)
• Equipment Type: Hydraulic Excavators, Construction Equipment

Every hour of downtime on a job site costs money. Restore your CAT excavator to full digging power with a complete matched injector set — order today and ship fast from Fuel Parts Depot.