Before the next tenancy handover, one of the most overlooked but essential checks is the door gearbox. A worn or failing gearbox can cause last-minute emergencies, security concerns, or even delays in move-ins. Here’s how to check whether your gearbox is still fit for purpose — and what to do if it isn’t.
What Is a Door Gearbox and Why It Matters
The gearbox is the centre of the multipoint locking system found in most uPVC and composite doors. When it wears out, the entire lock becomes unreliable.
Need a replacement gearbox?
👉 Browse compatible models here: Multipoint Lock Gearboxes
Why Door Gearboxes Fail
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Door misalignment
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Heat expansion
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Forced operation
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General wear and tear
These issues increase strain on the internal cogs, eventually causing failure.
Link beneath the image:
👉 Technal Door Lock Mechanism Gearbox
Common Signs the Gearbox Is No Longer Fit for Purpose
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Drooping or floppy handle
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Key difficult to turn
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Lock works when door open but not closed
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Clicking or grinding noises
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Door stuck shut
If you notice any of these signs, it’s often faster and cheaper to replace the gearbox immediately.
Explore replacement options:
👉 Multipoint Lock Gearboxes
Link beneath image:
👉 ERA Door Lock Centre Case Gearbox 35mm with Hook
How to Check the Gearbox Before a Let-In
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Lift the handle — should feel smooth.
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Turn the key — should not be stiff.
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Lock with door open — if better than closed, alignment or gearbox is failing.
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Listen for crunching or grinding.
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Inspect handle for sagging.
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Ask outgoing tenants if they noticed stiffness.
Quick checks like these prevent costly emergency callouts.
When to Replace the Gearbox
A gearbox must be replaced if:
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The handle stops engaging the lock
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The key jams
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The mechanism works intermittently
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The door only locks when lifted, pushed, or pulled
Replacing early prevents doors from becoming stuck shut.
Shop the product:
👉 Lockmaster Hook Door Lock Centre Case Gearbox
Final Thoughts
Before your next let-in, spend a minute checking the door gearbox. If anything feels off, replacing the gearbox is often the fastest and most cost-effective solution.
Need a reliable replacement fast?
✔️ Shop → Multipoint Lock Gearboxes
Check out the featured products from this article below 👇 including ERA Door Lock Centre Case Gearbox
