Easy
15-30 minutes
This switch is a genuine replacement part. This plastic part includes the trigger and internal switch used for Ryobi angle grinders. Because it is a mechanical switch, internal parts wear down with time and require replacement. This is a quick repair requiring only a screwdriver.
• Disassemble handle casing
• Remove old switch and disconnect wires
• Attach new switch to wires
• Attach switch to handle
• Reassemble handle casing
Switch 039028001045
OEM part for: Ryobi, Ryobi -TTI
Part Number: 039028001045
$6.39
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 6 machines
Ryobi
AG452K Angle Grinder View Diagrams & Manuals
AG453 Angle Grinder View Diagrams & Manuals
AG454 18 Volt Angle Grinder View Diagrams & Manuals
AG4531G Angle Grinder View Diagrams & Manuals
AG452 Angle Grinder View Diagrams & Manuals
Ryobi -TTI
AG452 Angle Grinder View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Grinder Parts
This part replaces obsolete part #: 039028007044 (4-25-17 (Rev:02))
Customer Part Reviews ?
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Extended the life of a good tool
The new switch for my Ryobi grinder looks identical, but I had to reshape some plastic on the grinder so the switch releases when I take my finder off of it. Otherwise, it is a big help and gives new life to my 20 year old angle grinder. I had to guess a little about connecting the wires, but that was easy enough based on past experience with electrical things. Someone might say, “Just get a new grinder.” but I have made a fixture for it that allows me to use my grinder as a biscuit cutter without buying a separate tool I use only occasionally. A new grinder would not be compatible with my biscuit cutter attachment.
Guest -
January 21, 2023
Verified Purchase
Works Perfectly
Original switch failed. My grinder is an older model & the exact replacement switch is no longer available. 'Took a gamble on the purchase of this particular switch and - phew - although the connection positions differed there was enough play in the wires to handle the change and the switch itself fit just fine.
Kenneth -
July 21, 2020
Verified Purchase
Easy repair if you know what you are doing
The part was in good new condition and fit my tool correctly. My tool model # was not listed ,so choose a tool that like mine . My model # is AG 454 MADE by RYOBI
Guest -
September 9, 2019
Verified Purchase
Part fit perfectly ! My grinder is like new !
Part arrived asap ! Packaged perfectly !
Guest -
April 26, 2019
Verified Purchase
Worked as it should.
I received the part sooner than I thought and it fit great.
Guest -
May 8, 2021
Verified Purchase
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Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Broken switch.
Michael - November 16, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Grinder
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Parts Used
1. Removed the old switch.
2. Easily replaced with the new switch.
2. Easily replaced with the new switch.
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Angle grinder: brushes worn out and switch over-heated / burned out.
Anthony - May 15, 2017
👍 2 of 3 people found this instruction helpful
Tool Type
Grinder
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, emery cloth, chip brush, soldering iron.
Parts Used
I bought this particular grinder because it has easily replaced brushes and it was easy. Removed the two screw on brush caps and the brush assembly (brush and spring) pulls right out. While you can just insert the new brush I chose to completely disassemble the motor to "turn" the armature end where the brushes ride and grease and lube everything. (FYI I bought two sets of brushes in case they go out of stock when I need to replace them again)
Replacing the switch is straightforward but disassembly of the handle is fiddley. Once all the screws are out you still have to gently pry the sides apart. Note how the wires are run as there's not much room and they have to go back the same way. And mine has a rotating handle so it has to fit into a channel properly too.
In a pinch, if you have the skills and a dremel, you can take the switch apart and swap the parts over to the other side and make it work. The switch is designed like two matching halves and only one side is used.
All in all it took about 30-60 minutes and it works like new. I hate to just toss out tools or things that still have lots of life left in them.
Replacing the switch is straightforward but disassembly of the handle is fiddley. Once all the screws are out you still have to gently pry the sides apart. Note how the wires are run as there's not much room and they have to go back the same way. And mine has a rotating handle so it has to fit into a channel properly too.
In a pinch, if you have the skills and a dremel, you can take the switch apart and swap the parts over to the other side and make it work. The switch is designed like two matching halves and only one side is used.
All in all it took about 30-60 minutes and it works like new. I hate to just toss out tools or things that still have lots of life left in them.
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Switch went bad.
Kevin - December 21, 2015
👍 4 of 7 people found this instruction helpful
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed one handle half from grinder, removed the switch. Disconnected the cord leads from the old switch and connected them to the new switch. Disconnected the motor leads from the old switch, then connected them to the switch. Attach switch to handle, make sure no wires gets pinched when assembling handle, then install the screws.
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No power to tool
Greg - February 12, 2021
Tool Type
Grinder
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver
Parts Used
Wasnt the exact replacement, but it worked. Instead of two screw tighten connections, there is one. The other wire connection is a push in.
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Switch broken
Jerry - January 15, 2021
Tool Type
Grinder
Difficulty
Easy
Time
15-30 minutes
Tools Used
Power Drill, Phillips screwdriver
Parts Used
Took side cover off and replaced switch and installed side cover. Easy job
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Rear bearing failure, wrorn brushes broken handles
Steven - December 31, 2018
Tool Type
Grinder
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
removed the parts to replace with new items purchased
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Switch went out on my 18V 4" Ryobi Grinder
Bryan - November 12, 2017
Tool Type
Grinder
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Fairly straight forward replacement repair although it was a tight fit. Wire connections were a bit different than original but easy to complete without any modifications.
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Switch burned.
John - November 5, 2017
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Replaced the switch.
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Switch would not function.
Marty - July 24, 2017
Tool Type
Grinder
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Star driver
Parts Used
1. Took the handle screws out.
2. Separated the handle.
3. Removed the switch from the handle.
4. Removed the wires from the switch.
5. Placed the wires in the connectors on the new switch.
6. Placed the switch in the handle casing.
7. Reinstalled the screws to the handle.
8. Plugged it in and tested.
2. Separated the handle.
3. Removed the switch from the handle.
4. Removed the wires from the switch.
5. Placed the wires in the connectors on the new switch.
6. Placed the switch in the handle casing.
7. Reinstalled the screws to the handle.
8. Plugged it in and tested.
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Faulty switch.
Walter - June 23, 2017
Tool Type
Grinder
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Replaced the old switch with the new one.
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
