Classic 3500 Series Heavy-Duty Replacement Sleeper Sofa Mechanism with 6" Innerspring Package

Replace damaged, rusted, worn-out, or unsafe sleeper units with a new Made-in-USA Replacement Sleeper Sofa Mechanism which features squared tubular construction that's safe, strong, well designed. When sleeper sofa mechanisms break, they can become uncomfortable, non-working, or worse, dangerous.  Wallace Flynn offers many different replacement sleeper sofa mechanisms. Repair it, don't replace it. 

If you're unsure, please contact us before ordering to ensure proper sizing. 

The strongest sleeper mechanism made, the Classic 3500 Series contract sofa sleeper system features engineered low-profile linkage to keep all metal parts below the mattress line. Its all-squared tubular frame construction provides improved safety and comfort in the seated position. The Classic 3500 Series from Wallace Flynn is a series of sofa sleeper mechanisms engineered with low-profile linkage to keep all metal parts below the mattress line. These mechanisms are easy to operate, and their all-squared tubular frame construction provides a smooth and visually appealing look. The Classic 3500 Series offers improved safety by eliminating pinch points, and the comfort in the seated position has been enhanced as well.

When ordering a replacement mechanism for your sofa, finding the manufacturer and model number information for the existing mechanism is very important. This ensures that you receive the correct fit for replacement. This model replaces the Leggett and Platt 3500 Classic Series mechanisms. Alternately, if the label is difficult to read, you can measure the distance between the brackets where the unit mounts into the wooden frame inside the sofa. 

Please look for the Leggett model number sticker on your current mechanism and match it to the model number below. The model number of your current mechanism is the only accurate way to ensure a correct replacement. Please reference the chart below to find your model number.

Available in the Following Widths:
Size - Model
44" - 3544, 4435
48" - 3548, 4835
55" - 3555, 5535
60" - 3560, 6035
68" - 3568, 6835

Please contact us before ordering to ensure proper sizing. All sleeper mechanisms are made in the USA