Introduction and Overview
The Marcy MWM-8147 150lb. Stack Home Gym is a multifunctional workout station designed for comprehensive strength training. This system integrates various exercise stations, including a pulley system, arm developer, and leg developer, to facilitate a full-body workout in a home environment. Its robust construction and versatile design make it suitable for weightlifting and bodybuilding exercises.

Figure 1: Overview of the Marcy MWM-8147 Home Gym.
Safety Information
Before operating the Marcy MWM-8147 Home Gym, please read and understand all safety instructions. Failure to follow these guidelines may result in injury or damage to the equipment.
- Always consult with a healthcare professional before starting any new exercise program.
- Ensure the equipment is assembled correctly and all bolts are tightened before use.
- Inspect the machine for worn or damaged parts before each workout. Do not use if any components are compromised.
- Keep children and pets away from the equipment during operation.
- The maximum recommended user weight for this equipment is 300 pounds.
- Utilize the 150-pound selectorized weight stack lock to prevent unauthorized use and to secure weights during adjustments.
- Perform exercises with controlled movements. Avoid sudden jerking motions.
- Wear appropriate athletic footwear and clothing.
Assembly and Setup
The Marcy MWM-8147 Home Gym is shipped in three separate boxes and requires assembly. Detailed instructions and diagrams are included with the product to guide you through the assembly process. It is recommended to have assistance during assembly due to the size and weight of components.
- Unpack all components and verify against the parts list provided in the assembly manual.
- Assemble the heavy-duty steel tubing frame first, ensuring all guard rods are securely in place.
- Install the 150-pound selectorized weight stack, following the specific instructions for cable routing and pulley attachment.
- Attach the dual-action press arms, removable curl pad, and leg developer.
- Ensure all nuts, bolts, and pins are securely fastened. For moving parts, do not overtighten until final adjustments are made as per the assembly guide.

Figure 2: Product dimensions for space planning. The gym measures 68"D x 43.3"W x 78.1"H.
Operating Instructions and Exercises
The Marcy MWM-8147 offers a variety of exercises targeting different muscle groups. Adjust the weight stack using the selector pin to your desired resistance level. Always ensure the pin is fully inserted before beginning an exercise.
Dual Action Press Arms
The dual-action press arms allow for both chest press and vertical butterfly exercises. A simple remove/insertion of a pin transitions between these functions, effectively developing your biceps, triceps, and pectorals.

Figure 3: Demonstrating Pectoral Fly and Seated Bench Press using the dual-action press arms. Note the foam padding for comfort and multi-grip handles.
Weight Stack System
The 150-pound selectorized weight stack allows for quick and easy resistance adjustments. Simply insert the selector pin into the desired weight plate. The safety lock prevents unauthorized use and ensures the weights remain secure.

Figure 4: Detail of the 150lb weight stack and its integrated safety lock mechanism.
Removable Curl Pad
The ergonomically designed seat includes a removable and adjustable preacher curl bicep pad, allowing for isolated bicep exercises with proper form and reduced tension.

Figure 5: The removable and adjustable preacher curl bicep pad for isolated bicep workouts.
Leg Developer
The integrated leg developer allows for exercises such as leg extensions and leg curls, targeting quadriceps and hamstrings effectively.

Figure 6: Detail of the leg developer for lower body exercises.
Included Accessories
The MWM-8147 comes with essential accessories to enhance your workout versatility:
- Extension Chain: For adjusting cable length and exercise range of motion.
- Threaded Quick Latch Links (x2): For quick attachment and detachment of accessories.
- Wrist/Ankle Cuff: For targeted leg and arm exercises.
- Multi-Function Lat Bar: For various pulldown and rowing exercises.

Figure 7: Overview of the accessories included with the Marcy MWM-8147 Home Gym.
Example Exercises

Bicep Curls

Standing Cable Press

Leg Extensions

Side Leg Raises
Maintenance
Regular maintenance ensures the longevity and safe operation of your Marcy Home Gym.
- Cleaning: Wipe down the frame, upholstery, and handles with a damp cloth after each use to remove sweat and dirt. Avoid abrasive cleaners.
- Inspections: Periodically check all nuts, bolts, and connections for tightness. Retighten as necessary.
- Cables and Pulleys: Inspect cables for fraying or wear. Ensure pulleys move smoothly and are free of debris. Lubricate moving parts as recommended in the full manual.
- Upholstery: Check the seat and backrest upholstery for tears or excessive wear.
Troubleshooting
If you encounter issues with your Marcy MWM-8147 Home Gym, refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Equipment feels unstable or wobbly. | Loose bolts or uneven surface. | Check and tighten all assembly bolts. Ensure the gym is placed on a flat, stable surface. |
| Cables are not moving smoothly or are noisy. | Friction, debris in pulleys, or misaligned cables. | Inspect cables for damage. Clean pulleys and lubricate as needed. Verify cable routing matches the assembly diagram. |
| Weight stack pin does not insert easily. | Misalignment of weight plates or bent pin. | Gently wiggle the weight plates to align holes. Ensure the pin is not bent. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | MWM-8147 |
| Brand | MARCY |
| Tension Level | 150 pounds (weight stack) |
| Maximum Weight Recommendation | 300 Pounds (user weight) |
| Material | Alloy Steel |
| Color | Black/White |
| Product Dimensions (LxWxH) | 68"D x 43.3"W x 78.1"H |
| Item Weight | 260 Pounds |
| Package Weight | 281 Pounds |
| UPC | 096362998147 |
Warranty and Support
The Marcy MWM-8147 Home Gym comes with a 2 Year Manufacturer Limited Warranty. This warranty covers defects in materials and workmanship under normal use.
For warranty claims, technical assistance, or replacement parts, please contact Marcy Pro customer support. Refer to the contact information provided in your product packaging or visit the official Marcy website for further details.
Seller: Marcy Pro
Returns: 30-day easy returns are available through the point of purchase.





