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Genuine Original Product The New High-quality Bus 24V Starter Motor M105R3039SE

The Prestolite M105R3039SE is a high-performance, heavy-duty starter motor belonging to the PowerPro 7.5 Series, engineered specifically for large commercial vehicles equipped with high-compression diesel engines. With a rated power output of 7.5 kW, this starter delivers exceptional cranking torque, ensuring reliable engine starts even under extreme conditions such as -35°C cold weather and prolonged idle periods.

Designed for durability, efficiency, and compact integration, the M105R3039SE features advanced technologies including an Integrated Magnetic Switch (IMS), planetary gear reduction, and a noseless design that improves heat dissipation and reduces installation space requirements. It is widely used in large Chinese-made buses, long-haul coaches, mining trucks, and heavy construction equipment powered by engines from Yuchai, Cummins, and other major manufacturers.
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  • M105R3039SE

  • Yutong Bus Parts

Attribute Description
Part Number M105R3039SE
Brand Prestolite / Peitela
Product Name PowerPro 7.5 kW Heavy-Duty Starter Motor
Rated Voltage 24V DC
Rated Power 7.5 kW (10 HP) – High-Cranking Output
Application Type Diesel Engine Starting (Large Buses, Trucks, Heavy Equipment)
Drive Gear Configuration 11 Teeth, Module/Pitch: 6/8 DP
Rotation Direction Clockwise (CW), viewed from drive end
Mounting Standard SAE #3 Flange (3-hole bolt pattern)
Reduction Type Planetary Gear Reduction
Magnetic Switch Integrated Magnetic Switch (IMS) – Built into housing
Housing Design Noseless (No front yoke cover) – Improved cooling & compact fit
Compliance Standards ISO 7637, SAE J188, GB/T 28046, ROHS
起动电机-3


起动电机-1


Parameter Specification
Operating Voltage 24V DC
Nominal Power Output 7.5 kW (10 HP)
Cranking Torque High-torque planetary gear system (~200–250 Nm typical)
Drive Pinion (Starter Gear) 11 teeth, 6/8 DP pitch
Free Speed ≥ 5,000 rpm (no load)
Full Load Current ~900–1,100A (depending on engine resistance)
Cold Cranking Amps (CCA) Supports up to 1,200+ CCA systems
Duty Cycle Max 30 seconds ON / Minimum 120 seconds OFF between attempts
Insulation Class H (Withstands up to 180°C)
Ambient Temperature Range -40°C to +105°C (-40°F to +231°F)
Vibration Resistance Meets ISO 16750-3 Class D
Cable Recommendation ≥ 70 mm² (2/0 AWG) battery cable required
Weight Approx. 12.5 kg (27.6 lbs)


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