Introduction
This manual provides essential information for the safe assembly, operation, and maintenance of your MARCY MWB-36780B Starter Weight Bench with 35kg Weight Set. Please read all instructions carefully before use to ensure proper function and to prevent injury. This weight bench is designed to support a comprehensive strength training routine, targeting chest, legs, arms, and shoulders.
Important Safety Information
- Consult with a physician before beginning any exercise program.
- Read and understand all instructions in this manual before assembling or using the equipment.
- Keep children and pets away from the equipment during use.
- Place the equipment on a solid, level surface with adequate clearance around it.
- Inspect the equipment for loose or damaged parts before each use. Do not use if any components are worn or broken.
- Ensure all bolts and nuts are securely tightened before use.
- Do not exceed the maximum weight capacities:
- Maximum User Weight: 90 kg (198 lbs)
- Maximum Total Load Capacity (User + Weights): 225 kg (496 lbs)
- Maximum Load on each Butterfly Arm: 30 kg (66 lbs)
- Maximum Load on Leg Curl: 45 kg (99 lbs)
- Maximum Load on Fixed Rack: 90 kg (198 lbs)
- Use proper lifting techniques and always use spotters when lifting heavy weights.
- Wear appropriate exercise attire and footwear.
- Stop exercising immediately if you feel faint, dizzy, or experience pain.
Included Components
Verify that all components are present before beginning assembly:
- MWB-36780B Weight Bench Frame and Upholstery
- 2 x 11.3 kg Vinyl Weight Plates
- 2 x 6.8 kg Vinyl Weight Plates
- 1 x 5 ft Standard Hollow Barbell
- 5 x Barbell Clips
- Assembly Guide
- Assembly Tools

Image: Overview of the Marcy MWB-36780B Weight Bench highlighting key features such as the removable arm curl, fixed rack, secure crossbar adjustment, 35kg weight set with 4ft bar, adjustable flat and incline bench, butterfly arms, 45kg leg curl capacity, high-density soft foam rollers, plate pegs, 14-gauge thick solid steel, and stability flanges.
Setup and Assembly
Assembly of the MARCY MWB-36780B weight bench requires careful attention to detail. Please follow the step-by-step instructions provided in the included Assembly Guide. Ensure all parts are correctly oriented and securely fastened before proceeding to the next step.
- Unpack all components and verify against the included components list.
- Lay out all hardware and tools as indicated in the Assembly Guide.
- Assemble the main frame structure, ensuring all bolts are finger-tightened initially.
- Attach the bench pad, backrest, leg developer, butterfly arms, and arm curl attachment according to the diagrams.
- Once all components are in place, progressively tighten all bolts and nuts using the provided tools. Do not overtighten.
- Perform a final inspection to ensure all connections are secure and the bench is stable.

Image: Diagram showing the dimensions of the Marcy MWB-36780B Weight Bench, including length (165cm), width (110cm), and height (128cm), along with specific measurements for the barbell rack and bench components.
Operating Instructions
The MARCY MWB-36780B offers versatility for various exercises. Familiarize yourself with its adjustable features before beginning your workout.
Bench Adjustments
- Backrest Adjustment: The backrest can be adjusted to flat or incline positions. Locate the adjustment pin or lever beneath the backrest, pull it out, adjust the backrest to the desired angle, and ensure the pin locks securely into place.
- Arm Curl Pad Adjustment: The arm curl pad can be removed and adjusted for height. Loosen the securing knob, adjust the pad to a comfortable height for bicep curls, and retighten the knob.

Image: The Marcy MWB-36780B Weight Bench shown in a flat position, illustrating the bench pad and barbell rack without weights.
Using Attachments
- Leg Developer: Attach weight plates to the leg developer post. Sit on the bench with your legs under the foam rollers. Perform leg extensions or leg curls as desired. Ensure the maximum load of 45 kg is not exceeded.
- Butterfly Arms: These arms are designed for chest exercises. Sit on the bench and place your forearms against the pads. Push the arms together in a controlled motion. Do not exceed 30 kg per arm.
- Arm Curl Attachment: Position the arm curl pad to a comfortable height. Rest your arms on the pad and perform bicep curls with the barbell or dumbbells (not included).

Image: Detailed close-up views of the Leg Developer, Biceps Pad, and Butterfly Arms attachments on the Marcy MWB-36780B Weight Bench, showing their connection points and design.
Using the Barbell and Weight Plates
- Place the 5 ft standard hollow barbell onto the fixed rack.
- Load the desired vinyl weight plates onto the barbell.
- Secure the weight plates with the provided barbell clips on both ends to prevent them from sliding off during exercise.
- Ensure the total weight on the fixed rack does not exceed 90 kg.

Image: A close-up view of the barbell loaded with vinyl weight plates, resting on the fixed rack of the Marcy MWB-36780B Weight Bench.
Maintenance
Regular maintenance ensures the longevity and safe operation of your weight bench.
- Cleaning: Wipe down the upholstery and frame with a damp cloth after each use to remove sweat and dust. Avoid abrasive cleaners.
- Inspection: Periodically check all bolts, nuts, and moving parts for tightness. Tighten any loose fasteners.
- Lubrication: Apply a light lubricant to pivot points and moving parts as needed to ensure smooth operation.
- Storage: Store the bench in a dry, clean environment away from extreme temperatures and direct sunlight.

Image: An informational graphic explaining the concept of steel gauge, illustrating that 14-gauge steel is thicker and more durable than higher gauge numbers (16, 18, 20 gauge), emphasizing the quality of Marcy products.
Troubleshooting
- Loose Components: If any part feels loose (e.g., butterfly arms, arm curl pad), check the corresponding bolts and knobs. Tighten them securely. Refer to the assembly guide for specific fastener locations.
- Squeaking Noises: Apply a small amount of silicone-based lubricant to pivot points or areas where metal parts rub together.
- Instability: Ensure the bench is placed on a flat, level surface. Check that all frame bolts are fully tightened.
Specifications
| Model Number | MWB-36780B |
| Dimensions (L x W x H) | 165 cm x 110 cm x 128 cm |
| Item Weight | 64 kg |
| Frame Material | Alloy Steel (14-gauge thick) |
| Upholstery | 1.5-inch-thick deluxe upholstery |
| Maximum User Weight | 90 kg |
| Maximum Total Load Capacity (User + Weights) | 225 kg |
| Maximum Load per Butterfly Arm | 30 kg |
| Maximum Load on Leg Curl | 45 kg |
| Included Weight Set | 2 x 11.3kg vinyl plates, 2 x 6.8kg vinyl plates, 1 x 5ft standard hollow barbell, 5 x clips |
Warranty and Support
The MARCY MWB-36780B Starter Weight Bench comes with a 2-year warranty from the date of purchase. This warranty covers manufacturing defects in materials and workmanship under normal use and service.
For warranty claims, spare parts, or technical support, please contact MARCY customer service. Keep your proof of purchase for warranty validation. Spare parts are available for a duration of 5 years within the EU.
For further assistance, please visit the official MARCY website or refer to the contact information provided in your purchase documentation.





