The M20040 Air Compressor & Accessory Drive Coupler Puller is a specialized heavy-duty service tool designed for removing splined couplers used on Cummins NT, NH, and 855-series accessory drive systems. These couplers connect the accessory drive to components such as the air compressor and operate under high torque loads with tight spline engagement.
Unlike pulleys, these couplers are typically:
- Splined and press-fit onto shafts
- Located in confined areas
- Subject to corrosion and heat cycling
The M20040 is specifically engineered to remove these couplers using a collet or jaw-style engagement system that grips the coupler evenly, while a forcing screw applies centered axial force to break the interference fit.
This design prevents:
- Damage to splines
- Shaft scoring
- Uneven loading on bearings
The tool is particularly critical when servicing:
- Air compressor drive couplings
- Accessory drive splined hubs
- Front gear case drive assemblies
Because these couplers do not have threaded puller holes and cannot be safely removed with standard gear pullers, the M20040 provides the only correct removal method for these components.
Manufactured from high-strength steel, the tool is built for repeated use in heavy-duty diesel environments, where high-load driveline components require controlled removal techniques.
Key Features & Benefits
- Designed for Splined Couplers: Works on air compressor and accessory drive couplings
- Collet/Jaw Engagement System: Grips coupler evenly for secure removal
- Centered Axial Force: Prevents spline and shaft damage
- No Threaded Holes Required: Ideal for press-fit couplers without puller points
- Heavy-Duty Construction: Built for high-load diesel applications
- Prevents Component Damage: Eliminates need for prying or hammering
- Application-Specific Fit: Designed for Cummins NT/NH/855 platforms
Typical Applications
- Air compressor drive coupler removal
- Accessory drive splined coupling service
- Front gear case and accessory drive repairs
- Engine teardown and rebuild procedures
- Heavy-duty truck, industrial, and marine diesel service
Why It Matters
Splined couplers are one of the most damage-prone components during removal because:
- They are tightly press-fit
- They lack threaded puller holes
- They require even force to avoid spline damage
Improper removal methods (pry bars, jaw pullers, or heat) can lead to:
- Damaged splines
- Shaft wear
- Costly component replacement
The M20040 eliminates these risks by providing controlled, evenly distributed pulling force, ensuring:
- Clean removal
- No spline distortion
- Reliable reinstallation