Important Safeguards
Please read all instructions carefully before using your Ninja DB751A Pro Plus DUO Blender. Failure to follow these safeguards may result in property damage or personal injury.
- Always ensure the appliance is properly assembled and locked before use.
- Do not immerse the motor base in water or other liquids.
- Avoid contact with moving parts.
- Do not blend hot liquids in the single-serve cups.
- Keep hands and utensils out of the container while blending to reduce the risk of severe injury to persons or damage to the blender.
- Blades are sharp. Handle with care.
- Unplug from outlet when not in use, before assembling or disassembling parts, and before cleaning.
- Do not operate any appliance with a damaged cord or plug, or after the appliance malfunctions or has been dropped or damaged in any manner.
Getting Started & What's Included
Your Ninja DB751A Pro Plus DUO Blender comes with the following components:
- 1400-Watt Motor Base
- 72 oz. Total Crushing Pitcher with Lid
- Pro Extractor Blades Assembly (for single-serve cups)
- (2) 24 oz. Single-Serve Cups with Spout Lids
- Stacked Blade Assembly (for 72 oz. pitcher)

Figure 1: All components of the Ninja DB751A Pro Plus DUO Blender system.
Assembly
Assembling the 72 oz. Total Crushing Pitcher:
- Place the motor base on a clean, dry, level surface.
- Carefully place the Stacked Blade Assembly onto the drive gear inside the pitcher.
- Add your ingredients to the pitcher. Do not exceed the MAX LIQUID fill line.
- Place the pitcher lid onto the pitcher, aligning the arrow on the lid with the arrow on the pitcher handle. Press down firmly until you hear a click. The handle must be in the locked position for the blender to operate.
- Place the assembled pitcher onto the motor base, aligning the arrow on the pitcher with the arrow on the motor base. Twist clockwise until it locks into place.
Assembling the Single-Serve Cup:
- Place the motor base on a clean, dry, level surface.
- Add your ingredients to the 24 oz. Single-Serve Cup. Do not exceed the MAX LIQUID fill line.
- Screw the Pro Extractor Blades Assembly onto the cup until a tight seal is achieved.
- Invert the cup and place it onto the motor base, aligning the tabs on the cup with the slots on the motor base. Twist clockwise until it locks into place.

Figure 2: The Ninja DB751A Pro Plus DUO Blender with both pitcher and single-serve cups.
Operating Instructions
Once assembled, plug the blender into a power outlet. The control panel will illuminate, indicating it's ready for use.
Auto-IQ Programs:
Auto-IQ Technology features intelligent programs that combine unique pulsing, blending, and pausing patterns to deliver consistent results. Simply select your desired program and let the blender do the work.
- SMOOTHIE: Ideal for fresh or frozen fruits and liquids.
- ICE CRUSH: Perfect for crushing ice for frozen drinks or snow cones.
- EXTRACT: Designed for whole fruits, vegetables, and nuts, extracting nutrients and vitamins.
Manual Controls:
For precise control over your blending, use the manual speed settings:
- LOW: For mixing and stirring.
- MED: For blending thicker ingredients.
- HIGH: For maximum speed and pulverizing.
- PULSE: For controlled chopping and processing. Press and hold for short bursts.

Figure 3: Control panel with Auto-IQ programs and manual speed options.
Care and Maintenance
Proper care ensures the longevity and optimal performance of your blender.
Cleaning:
- Dishwasher Safe: All containers, lids, and blade assemblies are top-rack dishwasher safe.
- Hand Washing: Wash containers, lids, and blade assemblies in warm, soapy water. Use a dishwashing utensil with a handle to avoid direct contact with blades. Rinse thoroughly.
- Motor Base: Wipe the motor base with a clean, damp cloth. Do not immerse the motor base in water.
- Stubborn Residue: For stubborn residue, fill the pitcher or cup with warm water and a drop of dish soap. Run the blender on the SMOOTHIE program for 30 seconds, then rinse.
Storage:
Store the blender upright with the pitcher or cup assembled on the motor base, or store components separately in a safe place to prevent damage.
Troubleshooting
If your blender is not operating as expected, refer to the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Blender does not turn on. | Appliance not plugged in; container not properly assembled/locked. | Ensure power cord is securely plugged into outlet. Verify pitcher or cup is locked onto the motor base and lid is securely fastened. |
| Ingredients are not blending smoothly. | Too many ingredients; not enough liquid; ingredients are too large. | Reduce ingredient quantity. Add more liquid. Cut large ingredients into smaller pieces. Use PULSE function to break down larger chunks. |
| Motor stops during operation. | Overheating due to overload. | Unplug the blender and allow it to cool for 15 minutes. Remove some ingredients and restart. |
Specifications
| Feature | Detail |
|---|---|
| Brand | Ninja |
| Model Number | DB751A |
| Power Source | Corded Electric |
| Voltage | 120 Volts |
| Capacity (Pitcher) | 72 oz. |
| Capacity (Cups) | 2x 24 oz. |
| Special Feature | Programmable (Auto-IQ) |
| Control Type | Automatic, Pulse |
| Container Material | Plastic (BPA Free) |
| Item Weight | 13.42 pounds |
| Product Dimensions | 6.75"D x 9"W x 17.5"H |
Warranty and Support
This Ninja product comes with a limited warranty. For detailed warranty information, product registration, or customer support, please refer to the warranty card included in your product packaging or visit the official Ninja website.
For further assistance, you may also contact Ninja customer service directly.