Easy
Less than 15 minutes
This is an authentic replacement part manufactured for use with Makita orbital sanders. The aluminum bearing box cover houses the lower bearing, and brake ring. A screwdriver is required to install the bearing box cover. Two bearing box covers are required, please note they are sold individually.
Bearing Box Cover 316834-4
OEM part for: Makita
Part Number: 316834-4
$6.05
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 14 machines
Makita
BO5021K Sander View Diagrams & Manuals
BO5010 Random Orbit Sander View Diagrams & Manuals
BO5021 Random Orbit Sander View Diagrams & Manuals
BO5020 Random Orbit Sander View Diagrams & Manuals
BO5011 Random Orbit Sander View Diagrams & Manuals
BO5012 5 inch Random Orbit Sander View Diagrams & Manuals
BO5010K Sander View Diagrams & Manuals
BO5012K Sander View Diagrams & Manuals
BO5021K (Type 1) Sander View Diagrams & Manuals
BO5021K (Type 2) Sander View Diagrams & Manuals
BO5021K (Type 3) Sander View Diagrams & Manuals
BO5021 (Type 1) Sander View Diagrams & Manuals
BO5021 (Type 2) Sander View Diagrams & Manuals
BO5021 (Type 3) Sander View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Sander Parts
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Perfect replacement!
Quick delivery. Fitted it with unbelievable ease. Tool back to service in no time! Works like new! Thanks!
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October 23, 2019
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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.
Bearing box cover was missing.
Thomas - October 27, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Using a Phillips screwdriver, removed the 3 screws from the rubber sanding pad, and removed the pad.
2. Placed the bearing box cover in place over the bearing box and put the rubber sanding pad on top of it, aligning the 3 holes, then reinstalled the 3 screws.
3. Holding the sander out-of-line from my body and face, turned it on to make sure it wasn't going to fly apart on me. Worked fine.
2. Placed the bearing box cover in place over the bearing box and put the rubber sanding pad on top of it, aligning the 3 holes, then reinstalled the 3 screws.
3. Holding the sander out-of-line from my body and face, turned it on to make sure it wasn't going to fly apart on me. Worked fine.
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Bearing cover blew off with old disk.
Dennis - August 31, 2020
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
This was a very simple repair. Thank God for Replacement Parts, they had everything I needed to put my sander back into operation.
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Missing part from discarding the original hook and loop disc
THOMAS - October 19, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Simply place over the bearing and attach the disc with the 3 screws.
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Pad supporting velcro-like sandpaper holder disintegrated (about 15 years old)
Floyd - August 10, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Removed old pad. Checked parts list online. Ordered replacement pad and bearing box cover.
2. Installed new parts. Trickiest move is getting three mount holes to line up while holding sander upside down between legs. Once you get one placed, the other two are easy.
3. Tested - works like new.
2. Installed new parts. Trickiest move is getting three mount holes to line up while holding sander upside down between legs. Once you get one placed, the other two are easy.
3. Tested - works like new.
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Somehow I'd lost this part when I'd replaced the disc holder, which had lost its little loops to hold onto the sandpaper discs.
David - June 17, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Removed sandpaper disc holder
2. Screwed the bearing box cover into place
3. Replaced the sandpaper disc holder
2. Screwed the bearing box cover into place
3. Replaced the sandpaper disc holder
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Bearing died
Frederick - April 26, 2018
Tool Type
Sander
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver
Remove hook loop pad using Phillips screwdriver.
With Phillips screwdriver remove center bearing and covers.
Replace and re-assemble reverse order above.
With Phillips screwdriver remove center bearing and covers.
Replace and re-assemble reverse order above.
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Misplaced cover.
GARY - October 25, 2017
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Replaced the cover.
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Hook and loop pad separated
Fred - August 30, 2017
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Remove old hook and loop pad, bearing box cover and brake ring.
Replace brake ring, bearing box cover and new hook and loop pad.
Replace brake ring, bearing box cover and new hook and loop pad.
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My velcro sander pad wore out and when I discarded the old one, I threw out the bearing box cover!
Richard - July 19, 2017
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Well, after I realized that I threw out the bearing box cover, I ordered a replacement. Only three screws held the pad to the sander. Once removed, it was pretty self-explanatory on how the bearing box cover fit place. Replace three screws and you are in business!
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Lost the bearing cover when changing the pad.
Mark - October 26, 2016
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed three screws and replaced the bearing cover.
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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.
