Keep your machinery operational with this premium 24-volt, 35-amp alternator, specifically engineered for the Caterpillar 308B Mini Excavator. Built to withstand the harsh environments of construction sites, this unit features an internal fan and internal regulator (IR/IF) for consistent performance and thermal management.
HEAVY-DUTY PERFORMANCE: Engineered to meet or exceed OEM specifications, ensuring your electrical system remains fully charged under maximum load.
Key Features
✔ Direct fit for Caterpillar 308B
✔ Internal Regulator & Internal Fan
✔ High-temperature resistant components
✔ Precision-balanced rotor for low vibration
Technical Specs
Voltage
24V
Amperage
35A
Rotation
Clockwise (CW)
Pulley Grooves
2-Groove (82.8mm OD)
Regulator
Internal (IR)
Polarity
Negative
Compatibility / Fitment Guide
Make
Model / Application
Engine Type
Caterpillar
308B Mini Excavator
Mitsubishi Industrial
Mitsubishi
Industrial Applications
Various 24V Systems
OEM Cross Reference
Caterpillar
139-7850
Mitsubishi
A3TA8199, A003TA8199, A3TA8199ZC, ME108147
Arrowhead
AMT0263, 400-48095
Lester / PIC
20059 / 203-5396
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part from 4Drive, manufactured to meet or exceed original equipment (OE) standards for heavy-duty construction use.
How do I know if it is compatible?
We recommend checking your original part for the number 139-7850 or A3TA8199. If your machine is a Caterpillar 308B, this is the standard fitment alternator.
Can this be used on 12V systems?
No, this is a dedicated 24V unit. Installing a 24V alternator on a 12V electrical system will cause significant damage to the batteries and electronics.
Note: Always disconnect the battery before installing a new alternator. Verification of the OEM number against your existing unit is the best way to ensure 100% fitment accuracy.
