Adjusting Murphy Bed Spring Tension: When and How

Why Spring Tension Matters

A wall bed, cabinet bed or DIY kit uses a counterbalance, typically coil springs or gas pistons, to offset the weight of the bed and mattress when the bed is raised. The maker sets that counterbalance to suit the mattress named on the listing. That is why a listing states a mattress thickness and sometimes a mattress type.

When the mattress gets heavier, for example after you swap a thin foam core for a thicker one, the counterbalance that was set for the old mattress may no longer match. When the mattress gets lighter, the mechanism may move differently. What you notice is a change in how the bed starts and finishes its motion while you raise it.

This article explains what an adjustment can change, when it makes sense to consider one, and why the maker's instructions come first. For a quick refresher on the two main mechanism families, see spring and piston mechanisms.

Spring Mechanisms and Piston Mechanisms

Coil spring mechanisms use steel springs that store energy as the bed moves. Gas piston mechanisms use a sealed cylinder of compressed gas; the same family is often called a gas strut or gas spring. Both are counterbalances, not motors: they help the motion, they do not move the bed on their own.

Some mechanisms are adjustable at the factory only, while others have a visible adjustment, such as a change in the spring anchor position or a piston with a rated force. Whether the reader can adjust anything at home is a feature of the specific design. The maker's page states which mechanism the bed uses; the maker's instructions state what the owner may change. See Springs vs pistons in Murphy beds for the differences.

When to Consider an Adjustment

The most common reason to think about tension is a change in mattress weight. A thicker mattress, a topper, or a different mattress type can shift the balance compared to what the listing specified. The less common reason is a change in how the bed is used, for example a guest bed that becomes a nightly bed.

Before adjusting anything, confirm what the listing says about the mattress. The maker's product page for the bed states the mattress it is designed for, and the maker's mattress page explains the options in general terms. If the mattress you plan to buy matches the listing, the mechanism should be in the range the maker intended; if it does not, read the maker's instructions before touching the mechanism. See mattress compatibility.

How an Adjustment Works in General Terms

An adjustment changes the amount of stored energy the mechanism carries when the bed is closed. With a coil spring, that often means changing the preload, the position of an anchor, or the tension of a spring around a bracket. With a gas piston, it can mean using a piston with a different force rating, or adjusting a fitting where the maker designed one. Some mechanisms have no owner adjustment at all.

The correct sequence belongs to the maker. A typical listing will not describe the adjustment steps; the maker's manual will. If the manual is missing or unclear, ask the maker before changing anything. Replacement parts, including a different piston force, are a question for the maker, not a matter of guesswork. See gas piston force rating and spring replacement.

What the Maker's Page States

Official maker pages describe the mechanism type. Wilding Wallbeds, for example, lists a spring lift mechanism on its Studio Series and a piston lift mechanism on its HomeFront Series, and states a lifetime warranty on the lifting mechanism. The same maker's cabinet bed page includes a tri-fold mattress with each model and a separate warranty for the cabinet and the mattress.

Night and Day Furniture's Murphy cabinet collection lists cabinet beds with a mattress option, including tri-fold gel memory foam and tri-fold gel pocket coil mattresses. None of these pages say that any owner must perform a tension adjustment; the takeaway is that the maker's own text decides. Use the maker's product page as the first source before you consider a change. For beds compared on stated details, see Murphy bed guides.

Questions to Ask the Maker Before Adjusting

Before adjusting spring or piston tension, write down the bed model, the mattress thickness, and the mattress type. Then ask the maker: Does this mechanism have an owner-adjustable tension? What exactly does the adjustment change? Do I need to remove the mattress or the face panel to reach it? Is a replacement piston or spring available if the mechanism is fixed?

The maker's instructions come first, and the maker's contact page is the place for anything the manual does not cover. This site cannot tell you the adjustment steps, the effort required, or the safety consequences of a specific change; only the maker's manual can.

Follow the Maker's Instructions

Keep the manual with the product. The manual states the mattress requirements, the box contents, and the mechanism care steps. Installation, anchoring, and any adjustment must follow that text. If the manual is missing, ask for a replacement before you act.

Remember that a Murphy bed is a piece of furniture under tension. Treat it as the maker's manual describes, and contact the maker when a part seems worn or missing. The site's guides compare listings on stated details; the manual remains the authority for your bed.

What to pick for your situation

Questions

Can I adjust the spring tension on my Murphy bed myself?

Only if the maker's instructions describe an adjustment. If the listing or manual does not mention it, treat the mechanism as fixed, and ask the maker before changing anything.

What changes the balance of a Murphy bed?

The mattress weight, the mattress thickness, and any topper. The maker sets the mechanism for the mattress the listing specifies.

Do gas pistons need adjustment?

Some pistons have a fixed force; others are available in different force ratings. The maker states which applies to the bed.

What if the manual does not mention an adjustment?

Contact the maker for the manual or for the correct step; do not improvise.

Does a heavier mattress mean I need a new spring?

Not necessarily. The maker decides whether a replacement part is available and what it should be. Ask the maker, and keep the bed's model and mattress details ready.

Where do I find the adjustment instructions?

In the maker's manual, not in a listing. If the manual is missing, ask the maker.