The M20010 Accessory Drive Pulley Puller is a heavy-duty, application-specific service tool designed for removing accessory drive pulleys from Cummins NT and NTC 855 diesel engines. These pulleys are typically press-fit or taper-mounted onto the accessory drive shaft, requiring controlled, even force for safe removal.
Unlike generic jaw-style pullers, the M20010 is engineered to bolt directly into the threaded holes of the accessory drive pulley, providing a secure, centered pulling force. This design eliminates side loading and uneven stress, which are common causes of pulley distortion, shaft damage, or premature bearing wear.
Once mounted, a forcing screw or puller mechanism applies axial force directly along the shaft centerline, allowing the pulley to be removed smoothly—even when seized from corrosion, heat cycling, or long service intervals. This controlled extraction is critical for preserving both the pulley and the accessory drive housing.
This tool is specifically designed for Cummins NT-series engines where accessory drive
Given the load and torque transmitted through this system, proper pulley removal is essential during accessory drive service, front gear train repairs, or complete engine overhauls.
Constructed from high-strength steel, the M20010 is built for repeated use in heavy-duty diesel environments and is a core tool for any shop servicing legacy Cummins platforms.
Key Features & Benefits
- Direct Bolt-On Design: Attaches to pulley using factory threaded holes for secure engagement
- Centered Pulling Force: Eliminates side loading and protects shaft alignment
- Prevents Component Damage: Avoids distortion of pulley and accessory drive housing
- Designed for NT/NTC 855 Engines: Correct geometry for Cummins accessory drive systems
- Controlled Removal: Smooth extraction even on seized or high-interference pulleys
- Heavy-Duty Construction: Built for repeated high-load use in diesel repair shops
- Improves Service Efficiency: Reduces removal time compared to generic pullers
Typical Applications
- Accessory drive pulley removal (Cummins NT / NTC 855)
- Air compressor and accessory drive service
- Front gear train and accessory housing repairs
- Engine teardown and rebuild procedures
- Industrial, marine, and heavy-duty truck engine maintenance
Why It Matters
Accessory drive pulleys on Cummins NT engines are mounted under high load and often become extremely difficult to remove over time. Improper removal methods—such as jaw pullers or prying—can result in:
- Bent or cracked pulleys
- Damaged shafts
- Misalignment of accessory drive components
The M20010 eliminates these risks by applying controlled, inline force, ensuring safe removal while preserving critical components. For technicians, this means:
- Reduced risk of costly damage
- Faster service times
- Reliable reassembly and alignment