How to Reset a Master Lock Combination: Quick DIY Guide

Published Date: Oct 24, 2025

Whether you’ve just bought a new lock or you forgot your Master Lock combination, knowing how to reset it is key to keeping your property secure. In this quick guide, we’ll walk you through how to reset a Master Lock combination — whether your lock has a reset lever or not. We’ll also cover what to do if you don’t know the combination and when it’s time to call a professional locksmith. Let’s make this part of your DIY security toolkit simple and stress-free — with support from the experts at Sure Lock & Key.

For Combination Padlocks Without a Reset Lever

Some locks, like the Master Lock 175D or similar models, don’t have a visible reset lever. In these cases, you need the current combination to reset it. Here's how to do it:

Open the lock using your existing combo.
Rotate the shackle 90° to the right until it aligns with the reset point.
Push the shackle down until it clicks.
Rotate the shackle again 90° to the next set position.
Set the new combination on the dials.
Pull the shackle up to return to its normal position.
Scramble the dials to lock in your new code.

This method works well for many styles of resettable padlock designs. Just be sure you write down your new code somewhere safe — losing it again brings its own problems.

For Combination Padlocks With a Reset Lever

If you have a combination lock with a reset lever inside, such as those used on storage units or gym lockers, follow these steps:

Open the lock using the current code (default is often 0-0-0-0).
Open the compartment door to access the reset lever.
Push the reset lever to the left and down. It should stay in place.
Rotate the dials to your new code.
Return the reset lever to its original position.
Close the compartment door and scramble the dials.

If you've reset your Master Lock combination successfully, give it a test. Better safe than locked out again.

What If You Forgot Your Master Lock Combination?

So, you’ve locked it and can’t remember the numbers? If you’ve forgot your Master Lock combination, don’t worry — you’re not alone. You’ve got a few options:

– Call a locksmith for house or commercial lock assistance
– Reach out for locksmith help if you need to prove ownership and recover access
– Learn how to pick a Master Lock (if you legally own it, and understand the risks)
– In some cases, the best move is to replace the lock altogether

Sure Lock & Key offers professional locksmith services to help you regain access safely, without damaging your lock or property.

Conclusion: When to Call Sure Lock & Key for Help

Resetting a Master Lock combination is simple — if you have the current code and know the model. If not, or if you’ve tried everything and still can’t unlock it, calling a professional may save time, stress, and damage.

If the lock won’t reset properly or the mechanism isn’t responding as expected, check if your model lets you change the combination as an alternative method.

Sure Lock & Key is here when DIY isn’t enough. Whether you need to reset a Master Lock combo, recover a lost code, or get back inside without damage — we’re here to help. Let us take the guesswork out of your combination lock problems — reach out today for fast, friendly service.

Frequently Asked Questions

How do I reset a Master Lock combination if I forgot it?

Unfortunately, you can’t reset a Master Lock without the current combination. You'll need to contact a professional locksmith or replace the lock.

Can all Master Locks be reset?

No, only resettable padlocks like the Master Lock 175D or models with a reset lever can have their combinations changed.

What tools do I need to reset a Master Lock combination?

Most resettable models require no tools — just the current combo and access to the shackle or reset lever.

How do I know if my lock has a reset lever?

Check the back or inside compartment of the lock. If there’s a small metal lever labeled “reset,” your lock has this feature.

Should I call a locksmith if my lock won’t reset?

Yes, if you're locked out or the lock won’t respond, it’s best to call a locksmith for house or business use to avoid damage.

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