Starter Motor M128R3821SE M128721 for Caterpillar D8K D8L D9L Heavy Equipment-Products-TIANGUAN-Page 1

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Starter Motor M128R3821SE M128721 for Caterpillar D8K D8L D9L Heavy Equipment

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ITEMNO： STG93827

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PRODUCT DETAILS

Starter Motor M128R3821SE / M128721 – 24V 12KW SAE1

Power Pro Extreme 12 – Replacement for Caterpillar Heavy Equipment

Product Description

The Power Pro Extreme 12 starter motor is a heavy-duty 24V, 12KW PMGR unit designed as a direct replacement for a wide range of Caterpillar and Delco Remy starter models. Built for industrial, construction, and earthmoving equipment, it delivers maximum durability, reliable engine cranking, and consistent starting performance under the most demanding conditions.

This starter features a clockwise (CW) rotation, 11T pinion with 6–8 DP pitch, SAE1 mounting, and insulated return polarity. It includes wet clutch protection and jump-start protection for enhanced operational safety. Direct-fit design ensures seamless replacement for Caterpillar M128-family applications.

Product Specifications

Property	Value
Brand	Power Pro Extreme 12
Part Numbers	M128R3821SE, M128721
Condition	New
Voltage	24 V
Output Power	12 KW
Rotation	Clockwise (CW)
Pinion Teeth	11 T
Pinion Pitch	6–8 DP
Pinion Diameter	57 mm
Pinion Rest Position	47 mm
Polarity	Insulated Return
Wet Clutch	Yes
Mounting Type	SAE1 (Special)
Spigot Diameter	92 mm
Switch Position	37.5°
Jump Start Protection	Yes
Product Family	M128
Weight	19.3 KG

OEM & Cross Reference Numbers

Brand / Manufacturer	Part Numbers
Caterpillar	3T5831, 3T2782, 3T2783, 3T2784, 3T8452, 3T8952, 6T0643, 6V0513, 6V0889, 6V0928, 7T9162, 7N6056, 7N6494, 7N7049, 9G6096, 9G6097, 0R2697, 0R4267, OR4267, 10R1914, 10R9816, 10478850, 10478859, 338-3455, 3383456, 338-3456, 353-7274
Delco Remy	10465601, 10479342, 10479144, 10479961, 10455855, 10457078, 10461732, 10478823, 10478850 (Rotate nose 307.5° Relay to C), 10478853, 10478855, 10478859, 1109555, 1109781, 1109788, 1109789, 1109833, 1109834, 1109836, 1990233, 1990234 (Rotate nose 307.5° Relay to C), 1990241, 1990291, 1993753, 323-790, 323790, 8200480, 8200543, 8200544, 8200545, 8200578 (Rotate nose 307.5° Relay to C)
Power Pro Extreme 12	M128721, M128R3821SE

Compatible Applications

Equipment Type	Models / Engines
Caterpillar Heavy Machinery	D8K, D8L, D9L, other CAT equipment requiring M128-family starters

PRODUCT HIGHLIGHTS

Feature	Description
High Power Output	12KW provides reliable and strong engine cranking for heavy machinery
OEM Direct Replacement	Compatible with Caterpillar M128-family and multiple Delco Remy starters
Durable Construction	Designed for industrial, construction, and earthmoving equipment
Safety Features	Includes wet clutch and jump-start protection for secure operation

SHIPPING

Item Details

Processing Time Orders are processed within 1-3 business days after payment confirmation

Shipping Methods DHL/UPS/ FedEx/ TNT/ Air Freight/ Sea Freight

Estimated Delivery Time Express shipping: 3-7 business days, depending on destination

Packaging Export-standard cartons with protective inner packing

Tracking Tracking number will be provided once the order is shipped

Shipping Cost Calculated based on weight, dimensions, and destination

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WARRANTY POLICY

All new aftermarket parts come with a 1-Year warranty. Quality is the first thing we consider. Check out our Warranty Assistance for more details.

SHIPPING POLICY

We offer express and standard shipping options to ensure your off-road machine gets back in action—fast and reliably. For more details, please visit our Shipping Policy .

EASY RETURN POLICY

We prioritize your satisfaction. If your order doesn't meet your expectations within 90 days, you may be eligible for a refund. See our Easy Return Policy for details.

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