Johnson Magnum Series

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document outlines the assembly instructions for a rubber platform designed for use with Johnson Fitness equipment, specifically Magnum and Varsity A-05, D-05, and MR-04 Series Power Racks. The assembly guide, prepared by Rich Degenhardt and dated June 18, 2015, with an effective date of July 1, 2015, provides a step-by-step procedure for installing the platform. The revision date for the document is May 11, 2017, and it was revised by Emilie McWilliams.

Function Description:

The rubber platform serves as an integrated base for power racks, providing a stable and durable surface for users during exercise. It is designed to be securely attached to the power rack frame, creating a unified and robust structure. The platform likely offers benefits such as noise reduction, floor protection, and enhanced stability for the power rack, which are crucial in a gym or fitness environment. The use of rubber pieces on top of wooden sections suggests a design intended to absorb impact and provide a non-slip surface, which are important safety features for weightlifting and other high-impact exercises.

Important Technical Specifications:

The assembly requires specific tools: a 3/16" Allen wrench, a 4MM Allen wrench, and a drill. The initial attachment of the platform mounting bracket to the frame uses (4) 3/8-16 x 3/4" bolts and (4) 5/16" flat washers. These fasteners indicate the structural components and the type of hardware needed for secure installation. The platform is composed of multiple sections, including a "tongue" or "underlip" section without angled corners, two main wood sections, and rubber pieces. The use of drywall screws is specified for connecting the wooden sections, indicating that the wooden components are likely made of a material compatible with such fasteners, such as plywood or particle board. The platform's design allows for adjustment by loosening bolts on the power rack's rear brace, which suggests a degree of flexibility in fitting and alignment to achieve a "perfect fit" with various power rack configurations within the specified models.

Usage Features:

The assembly process is designed to be straightforward, involving several distinct steps.

Mounting Bracket Installation: The first step involves attaching the platform mounting bracket to both sides of the power rack frame using bolts and flat washers. It is crucial to leave these bolts loose initially to allow for later adjustments. A key detail is to place the outside edge of the mounting bracket flush with the outside of the plastic cap on the power rack, ensuring proper alignment.
Frame Support Installation: A frame support is installed under the power rack mainframe, positioned just behind the platform mount. This support likely contributes to the overall stability and load-bearing capacity of the platform.
Platform Insertion: The "tongue" or "underlip" section of the platform, characterized by its lack of angled corners, is inserted into the rack. This suggests a specific orientation and interlocking mechanism for the platform to integrate with the power rack.
Tube Rail System Assembly: A tube rail system is assembled using a 3/16" Allen wrench and supplied parts. This rail system likely forms the perimeter or a structural component of the platform, providing containment or additional support for the wooden and rubber sections.
Wood Section Placement: The two main wood sections of the platform are dropped into place. The instructions specify dropping the right side (under lip side) first, followed by the left, indicating a specific sequence for proper fit and alignment.
Wood Section Connection: The wooden sections are connected using included drywall screws. This step ensures that the individual wood pieces form a cohesive and stable base.
Rubber Piece Installation: The rubber pieces are installed on top of the wooden sections, with an emphasis on ensuring the smooth side of the rubber faces up. This detail is important for both aesthetics and functionality, as the smooth side likely provides the intended non-slip and protective surface.
Final Adjustment: The final step involves ensuring the wood is tightly pinched between the power rack frame and the platform rail. To achieve this, adjustments can be made by loosening the bolts on the power rack's rear brace and then moving the brace forward or backward until a "perfect fit" is achieved. This adjustability is a critical feature, allowing for precise alignment and secure integration of the platform with the power rack, which is essential for safety and stability during use.

Maintenance Features:

While the document primarily focuses on assembly, the mention of "leaving bolts loose for adjustment" and the final "adjustments" step implies a design that allows for fine-tuning and potential re-tightening over time. The use of standard fasteners (bolts, washers, screws) means that components can likely be replaced or tightened with common tools if wear and tear occur. The rubber surface, if properly installed with the smooth side up, is designed for durability and ease of cleaning, which are typical maintenance considerations for gym equipment. The ability to adjust the fit between the wood, frame, and rail suggests that minor shifts or settling of components can be corrected, contributing to the longevity and safety of the platform. Regular inspection of the fasteners and the overall fit would be a recommended maintenance practice to ensure continued secure operation.