The M20022 Alternator & Accessory Drive Puller is a precision-machined service tool designed specifically for removing accessory drive and alternator pulleys on Cummins L10 (old style) diesel engines. This tool directly replaces Cummins reference 3376383 and is engineered to safely extract pulleys that are press-fit or taper-mounted onto the accessory drive shaft.
On L10 engines, accessory drive pulleys are mounted under high interference and often seize due to heat cycling, corrosion, and long service intervals. The M20022 addresses this by using a bolt-on puller plate design, which threads into the pulley using factory mounting holes. This creates a stable, centered pulling force that eliminates the risks associated with jaw-style pullers.
Once installed, a forcing screw applies axial pressure directly along the shaft centerline, allowing smooth removal without side loading. This is critical for preventing:
- Shaft damage
- Pulley distortion
- Bearing misalignment
The tool is typically configured with M12 x 1.75 thread engagement, matching the pulley design used on L10 accessory drives.
This controlled removal method is essential when servicing components driven by the accessory system, including:
- Alternator drives
- Air compressor drives
- Hydraulic or auxiliary drives
Built from high-strength steel, the M20022 is designed for repeated use in heavy-duty diesel environments, making it a core tool for shops servicing legacy Cummins L10 platforms.
Key Features & Benefits
- Direct Bolt-On Engagement: Threads into pulley for secure, slip-free pulling
- Centered Extraction Force: Prevents side loading and shaft damage
- Reference Compatibility: Replaces Cummins 3376383
- M12 x 1.75 Thread Design: Matches factory pulley mounting configuration
- Controlled Removal: Smooth extraction of seized or press-fit pulleys
- Protects Critical Components: Prevents distortion of pulley and accessory drive housing
- Heavy-Duty Construction: Built for repeated high-load use
- Improves Service Efficiency: Eliminates need for prying or improvised pullers
Typical Applications
- Alternator drive pulley removal (Cummins L10 old style)
- Accessory drive pulley service and replacement
- Front gear housing and accessory drive repairs
- Engine teardown and rebuild procedures
- Industrial, truck, and off-highway Cummins L10 applications
Why It Matters
Accessory drive pulleys on Cummins L10 engines are not forgiving. Improper removal methods—especially jaw pullers—can easily lead to:
- Bent pulleys
- Damaged shafts
- Misalignment of accessory drive components
The M20022 eliminates those risks by applying controlled, inline force through the pulley centerline, ensuring safe removal every time.
For technicians, this means:
- Faster teardown
- No collateral damage
- Reliable reassembly and alignment