Cat Alternator
Cat Alternator
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Cat® Alternator Replacement

CAT SELF-SERVICE OPTIONS (SSO)

Ready to replace a Cat® alternator? Our Self-Service Option includes what you need to do the work yourself.

Cat alternators are built to Caterpillar OEM specs to help ensure your equipment starts fast and finishes strong every day — even in the most extreme conditions and harshest climates.

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Maintenance Tips

Watch for these common repair indicators:

  • Engine cranks too slowly to start

  • Alert indicator comes on

  • Dim or flickering lights

  • Dead battery

  • Grinding noise when the ignition key is turned

  • Other electrical failures

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What's in the Cat Alternator Replacement Self-Service Option?

 

Recommended Parts

 

  • Alternator

Recommended Tools

 

  • No specialized tools required

  • Repair instructions included

 

 

Available on the Following Models:

Compact Track Loaders

239D, 249D, 259D, 279C, 289C, 289D, 299C, 299D

Compact Wheel Loaders

901C, 902, 902C, 903C, 904H, 906, 906H, 906K, 906M, 907H, 907K, 907M, 908, 908H, 908K, 908M, 910, 910F, 910G, 910K, 910M, 914G, 914K, 914M, 916, 918F, 918M, 920K, IT14G

Small Wheel Loaders

924F, 924G, 924H, 924K, 926M, 928F, 928G, 928H, 930G, 930H, 930K, 930M, 936F, 938F, 938G, 938H, 938K, 938M, IT28G, IT38H

Skid Steer Loaders

216, 216B, 226, 226B, 226D, 228, 232, 232B, 232D, 236, 236B, 236D, 242, 242B, 242D, 246B, 246, 246C, 246D, 248, 248B, 252, 252B, 256C, 262, 262B, 262C, 262D, 268B, 272C, 272D

Backhoe Loaders

414E, 415F, 416, 416B, 416C, 416D, 416E, 416F, 420D, 420E, 420F, 422E, 422F, 424B, 424D, 426, 426B, 426C, 426F, 427F, 428, 428B, 428C, 428D, 428E, 428F, 430D, 430E, 430F, 432D, 432E, 432F, 434E, 434F, 436, 436B, 436C, 438, 438B, 438C, 438D, 442D, 442E, 444E, 444F, 446, 446B, 446D, 450E, 450F

Multi-Terrain Loaders

247, 247B, 257, 257B, 257D, 267, 267B, 277, 277B, 277C, 277D, 287B, 287C, 287, 287D, 297C, 297D

Small Dozers

D3G, D3K, D4E, D4G, D4K, D5G, D5K

Mini Hydraulic Excavators

300.9D, 301.4C, 301.5, 301.6, 301.6C, 301.7D, 301.8, 301.8C, 302, 302.2D, 302.4D, 302.5, 302.5C, 302.7D, 303, 303C, 303E, 303.5, 303.5C, 303.5D, 303.5E, 303.6, 304, 304C, 304D, 304E, 304.5, 304.5E, 304.6, 305, 305C, 305D, 305E, 305.5, 305.5D, 305.5E, 306, 306E, 307, 307B, 307C, 307D, 307E, 307.5, 308, 308C, 308D, 308E, 308.5, 309, 310

Telehandlers

TH103, TH210, TH215, TH220B, TH306D, TH330B, TH340B, TH350B, TH3510D, TH355B, TH357D, TH360B, TH408D, TH460B, TH514D, TH560B, TH580B, TL642D, TL943D, TL1055D, TL1255D

Motor Graders

120B, 120G, 120H, 120K, 120M, 140G, 140H, 140K, 140M

Soil Compactors

CS423E, CS433C, CS433E, CS44B, CS533D, CS533E, CS54, CS54B, CS55, CS56B, CS563C, CS563D, CS563E

Dozers

D4H, D5H, D5M, D5N, D6D, D6E, D6H, D6K, D6M, D6N, D6R, D6T

Hydraulic Excavators

313D, 314C, 314D, 314E, 315B, 315C, 315D, 316E, 318D, 320B, 320C, 320D, 320E, 321C, 321D, 322B, 322C, 323D, 324D, 324E, 325B, 325C, 325D, 328D, 329D, 329E, 330B, 330D, 330F

Wheel Loaders

950G, 950H, 950K, 950L, 950M, 962H, 966D, 966E, 966F, 966G, 966H, 966K, 966L, 966M, 970F, 972G, 972H, 972K, 972M

Frequently Asked Questions

 

 

 

What typically causes alternator failure?

Alternators have moving parts, get dirty and are subject to stress from hot and cold temperatures. Their internal parts gradually wear out. Bearing failure is most common. The bearings that allow the rotor to spin freely inside the stator can break down from dirt and heat. When they fail, the rotor will not spin efficiently and can eventually seize.


 



 

How do I remove an old alternator?

Turn the battery disconnect switch off. (If your machine doesn't have a battery disconnect switch, disconnect the battery cables.) Loosen and remove the bolts and the guard. Loosen the bolts and push the alternator in to remove the V-belt. Remove the nut and disconnect the harnesses. After you remove the bolts, you can take out your old alternator.

NOTE: Always consult your machine's Operation & Maintenance Manual for specific instructions.
 



 

How do I install a new alternator?

Insert the new alternator and put the nut and harnesses back on. Hand-tighten the bolts, install the belt and screw in the bolts. Place the guard and install the bolts. Turn the battery switch back on and test your new alternator to make sure it's working properly.

NOTE: Always consult your machine's Operation & Maintenance Manual for specific instructions.
 



 

 

 

 


Cat Construction Equipment Maintenance: Do It Yourself Articles

Proper maintenance keeps your equipment reliable and job-ready. Check out these articles for hands-on tips to extend the life of your machine.

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EXPLORE AVAILABLE SELF-SERVICE OPTIONS

Ready to perform your own maintenance and repairs? We have the tools you need. We periodically expand the list of available Cat Self-Service Options (SSO). Download the file to find if your model has SSO coverage. With the right parts, tooling, service instructions and technical support in one convenient package, you'll get back on the job in no time!

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Cat Reman Starters & Alternators
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Here's a way to save yourself even more time and effort when maintenance and repairs are due. Order Cat Self-Service Options online anytime at parts.cat.com.

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Self-Service Options

Get what you need for simple repairs and maintenance with Cat Self-Service Options. Includes Cat parts with tooling, easy-to-follow service instructions and access to tech support.

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