For 349-6519 20R-1312 Electric Motor Assembly CAT 349E 352F Excavators Start Motor

The 349-6519 and 20R-1312 electric motor assemblies are dedicated start motors engineered for CAT 349E and 352F large excavators, serving as the critical power source for engine ignition. As the "starting heart" of the excavator, this assembly integrates a high-torque motor, electromagnetic switch, drive gear, and cooling system, working in synergy to convert electrical energy from the excavator’s battery into mechanical energy, driving the engine crankshaft to rotate and achieve reliable startup.

Manufactured in strict accordance with CAT’s OE technical specifications, the start motor is tailored to the harsh working conditions of large excavators—including high dust, vibration, and temperature fluctuations (-30°C to 60°C). Each unit undergoes rigorous performance testing, including load torque measurement, startup frequency verification, and waterproof and dustproof testing, ensuring seamless compatibility with the electrical system and engine of 349E/352F excavators. It effectively avoids common faults such as weak startup, failure to engage gears, and burnout caused by mismatched or low-quality start motors.

• Model-Specific Compatibility: Precisely matched to CAT 349E and 352F excavators, with consistent mounting brackets, wiring harness interfaces, and gear parameters. Plug-and-play installation eliminates the need for electrical system modifications, reducing maintenance downtime by 60% compared to non-specialized motors.
• High-Torque & Durable Core: Adopts a copper-wound stator and rotor with high magnetic density, delivering peak torque of 450-550 N·m to ensure rapid engine startup even in low-temperature or battery-low conditions. The drive gear is made of hardened alloy steel, with a service life 2.5x longer than ordinary carbon steel gears.
• Enhanced Environmental Protection: Equipped with IP67-level waterproof and dustproof housing, and a corrosion-resistant zinc-plated surface treatment. Effectively isolates muddy water, dust, and oil in construction sites, preventing internal component short circuits or wear.
• Energy-Saving & Reliable: The optimized electromagnetic switch reduces idle current consumption by 15% when not in use, protecting the excavator’s battery. The built-in overheat protection device automatically cuts off the circuit when the temperature exceeds 120°C, avoiding motor burnout and ensuring operational safety.

• Rapid & Stable Startup: The motor reaches rated speed (2800-3200 rpm) within 0.5 seconds, and the drive gear engages the engine flywheel with an accuracy of 99.5%, ensuring the engine starts successfully within 1-2 seconds even at -30°C. It supports 10 consecutive startup cycles without performance degradation.
• Strong Load-Bearing Capacity: Maintains stable torque output under voltage fluctuations (10-14V), adapting to the battery voltage changes during the startup process. For CAT 349E/352F excavators with large-displacement engines, it can reliably drive the crankshaft to overcome initial resistance, with a startup success rate of 100% under standard conditions.
• Long Service Life & Low Maintenance: The sealed bearing structure and high-temperature lubricating grease reduce internal wear, enabling an average service life of 8000-10000 working hours. Maintenance only requires regular cleaning of the air filter, eliminating the need for frequent disassembly and overhaul.
• Adaptability to Extreme Conditions: Works stably in harsh environments such as high-altitude (up to 4000 meters), high humidity (relative humidity 95%), and strong vibration (vibration acceleration ≤10g). Ensures excavator startup reliability in plateau mining, coastal construction, and other complex scenarios.