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How to Bypass Safety Switch on John Deere Lawn Mower

The safety switch is installed in a mower in order to save us from any type of injury. However, some people do not agree to have a safety switch on the mower because they need to tap the safety switch when moving in a reverse position.

So, the solution is to bypass the safety switch. Bypassing the safety switch on John Deere’s lawn mower is a simple process. You can do this at home by yourself by following some steps, and it does not take too much time. 

Steps to follow

These are some simple steps to bypass the safety switch on the mower. After gathering tools, we can start the bypass process. Be sure to do this process with safety gadgets. 

Required tools

First thing first, we need to gather some essential tools before starting the bypass safety process. Thus, it would be best to have a ratchet, pliers, pair of hand gloves, and goggles.


First, take the lawnmower into your garage for the convenience of the work. Then disconnect all the plugs. This means, enable the parking mode of the mower and disconnect the spark plug from the mower. Then remove the screws that is attached to the mower front hood. Then you can easily pull the hood upwards.

How to Bypass Safety Switch on John Deere Lawn Mower

The Battery Cables

Once you open the hood, you will locate the battery. Then stop the battery cables from the terminal. At first, disconnect the negative cable from the terminal by employing a ratchet. Now, dis-attached the positive cable also from the terminal.

The Battery Cables

Disconnect the Safety Switch

Look for the safety switch which is beside the negative terminal of the mower battery. Generally, the safety switch is made of a plastic harness. If you look closely then you will find two wires are attached to the harness.

About the wires, hold the plastic harness with one hand and pull the cables with the other hand. If you are unable to disconnect the wires by hand, do not worry you can use pliers. Garb the wires with pliers and pull them outward, this will do the work.

Disconnect the Safety Switch

The Wires and the Battery Cables

After removing the wires, tie the wires together. Use electrical tape to cover the wires. After all, this is for safety purposes.

Now, it is time to reconnect the battery cables. Keeping this in mind, this time, you have to connect the positive cable first. Then, reconnect the negative cable also.

The Wires and the Battery Cables

Final touch

It is time to replace the hood in its previous position. Set the hood and attach the screws. Now, take your position within the mower seat and place the key within the switch. Activate the facility of the mower. Test the mower by lowering the mower deck and interesting the mower blade.

You have to monitor this test if it is successful or not carefully. Otherwise, you have to do this bypass safety switch process again. When it is possible to move the mower quickly into the reverse position, then the bypass of the security switch is successful. 


Never do technical work with bare hands. Remember to wear hand gloves when disconnecting the wires by hand. Also, carefully operate ratchet and pliers to avoid any quite unwanted injury.

But, when you are at step f bypassing the lawnmower safety switch, do not permanently disable the switch. It will only violate the warranty of the manufacturers. So, take care while doing this.

Way to Fix the Safety Switch

There are two main safety switches on the John Deere. One switch prevents the machine from starting if the operator has not followed the right starting procedure. The opposite switch prohibits blades from turning when no operator is present. 

Way to Fix the Safety Switch

Fixing the lousy safety switch requires a few short steps.


The first switch is found under the hand brake, and therefore the second is found under the operator’s seat. 

If one or both of the switches malfunction, the lawn mower’s engine will not turn over, or personal safety may be at risk.


You will need a new parking brake safety switch, a ratchet, an 8 mm socket wrench and a pair of gloves. Be sure to use clean tools for health reasons.  


Park the mower on a tough, level surface. Sit within the operator’s seat and depress the parking-brake pedal on the left-hand side of the front fender.

Turn the key. If the engine fails to show over, the hand brake switch may have malfunctioned. If the engine turns over, the operator switch is responsible.


After locating the parking brake safety switch, you will see two bolts holding the button to the frame. Try removing the bolts with an 8 mm socket wrench. Unplug the switch from the wiring harness. Then, plug in a new parking-brake safety switch and reinstall the two 8 mm bolts.

Last step 

Now, it is time to test the switch. Sit within the operator’s seat, depress the hand brake. Then start the engine to ensure proper installation. The engine should turn over with the parking brake depressed, which means the process is successful.


1. Where is the bypass rod on John Deere?

Answer: The bypass rod is located at the rear of the machine of your John Deere.

2. How does a seat safety switch work?

Answer: Riding lawn mowers have a security switch located under the seat. This switch is commonly called a “kill switch”. Turns off the engine when the mower deck is engaged, and therefore the rider gets off the seat. This is necessary because this prevents injury if the rider falls off the mower while operating it.

3. How many safety switches are on a riding John Deere lawnmower?

Answer: There are 4 safety interlock switches on a lawn and garden tractors.

4. How does one reset the service light on a Deere d140?

Answer: Turn the key to the “Run” position, but do not start the engine. Leave the key during this position for 2 hours, then turn the key to the “Stop” position and take away the key. The service timer will reset and are available when a subsequent service interval is reached.

Final Verdict

Finally, we can say that bypassing the safety switch on John Deere’s lawn mower is really a simple task. In fact, there is no need to call any technician to this bypass process.  This process approximately takes 12-16 minutes. You can also check our guide on How to Put a Belt on a John Deere Lawn Mower.

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