How do I confirm pilotpart133331-8388440588536 fits my machine?

Compare the OEM or reference part number, machine model, engine model, and serial number. You can also submit a fitment inquiry before ordering.

In Stock

Alternator 378-9645 3789645 for Caterpillar CAT Engine C6.6 Loader 559

For Caterpillar Alternator

Alternator IA1117 for Caterpillar

Q: What part numbers are associated with this Alternator?

IA1117, 11.204.254, ALT20644, 635.529.150.090, MG52, AAN8166, CA3789645, 378-9645

OEM / REF: IA1117SKU: pilotpart133331-8388440588536

Alternator 378-9645 3789645 for Caterpillar CAT Engine C6.6 Loader 559 is a Alternator replacement part for Caterpillar Engine Spare Parts, categorized under Engine Spare Parts > Alternator. Use OEM part number IA1117 and confirm machine model, engine model, and serial details before checkout.

Stock: In stock
Condition: New
Fitment: Caterpillar Engine Spare Parts
Category: Alternator

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$309.00USD/EA

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Aug 21 – Aug 28
10	Aug 19 – Aug 26
50	Aug 17 – Aug 24

Estimates from today; confirm exact lead time before payment.

Quantity

Confirm fitment before ordering →

Lead times can vary by freight route and customs. Contact support for expedited shipping.

Alternator Description

This Alternator is indexed for Caterpillar CAT Knuckleboom Loader: 559. Compare reference number IA1117 against the label on your existing Caterpillar component before ordering.

Additional cross references on file: 11.204.254, ALT20644, 635.529.150.090. If your machine plate shows a different number, submit a fitment inquiry with photos before checkout.

Part Numbers and Cross References

IA1117 11.204.254 ALT20644 635.529.150.090MG52AAN8166 CA3789645 378-9645

Applications

Caterpillar CAT Knuckleboom Loader: 559

Fitment Notes

Brand or application signal: Caterpillar Engine Spare Parts
Product family: Alternator
System category: Engine Spare Parts > Engine Auxiliary Components > Alternator
Recommended verification: OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability: InStock
Shipping: Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns: Returns are easier when fitment is confirmed before ordering.
B2B support: Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.