For Caterpillar Excavator 304CR 305CR Engine K4N S4L2 Starter Motor 31A66-00102
Available to Order
Not sure which part fits your equipment?
Our Northline Parts team can help you find the right replacement. Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT | Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Product Overview
This heavy-duty starter motor is engineered for reliable engine ignition in Caterpillar 304CR and 305CR excavators. Built to meet or exceed original equipment standards, it ensures consistent performance in demanding construction environments.
Key Features & Performance
- Reliable Starting: High-torque design provides dependable starting power in various weather conditions.
- Durable Construction: Built with premium materials to resist wear and extend service life.
- Precision Engineering: Manufactured for a perfect fit and seamless integration with existing engine components.
Fitment & Compatibility
- Caterpillar Excavators: 304CR, 305CR
- Engine Models: K4N, S4L2
Technical Specifications
- Part Number(s): 31A66-00102
- Part Type: Starter Motor
- Equipment Type: Excavator
Frequently Asked Questions
- Q: Is this part compatible with my specific serial number? A: While designed for 304CR and 305CR models, compatibility can vary; please verify your part number matches 31A66-00102.
- Q: Does this starter motor come with the mounting bolts? A: This unit is a direct replacement for the starter motor itself; original hardware should be reused or purchased separately if needed.
Compatibility may vary by serial number. Verify fitment before purchase.