Easy
Less than 15 minutes
This small belt controls the random orbit functions of common Porter-Cable palm sanders. If this belt breaks, the sanders will operate poorly and the pad will rotate at a high rate of speed.
Sanding functions will be disabled.
This belt is a genuine Porter-Cable replacement part.
Removing the sanding pad and replacing this belt is an easy repair.
This belt is compatible with the Porter Cable sanders listed below.
Random Orbit Belt 903373
OEM part for: Porter Cable
Part Number: 903373
$3.99
In Stock
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Product Description ?
- Approximately 2-1/2 Inches in Diameter
- Classification: Part
- Weight: 0.01 lbs.
- Also Known As: Drive Belt
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 29 machines
Porter Cable
332 Type 2 Random Orbit Palm Sander View Diagrams & Manuals
332 Type 3 Random Orbit Palm Sander View Diagrams & Manuals
333 Type 1 Random Orbit Palm Sander View Diagrams & Manuals
333 Type 2 Random Orbit Palm Sander View Diagrams & Manuals
333 Type 3 Random Orbit Palm Sander View Diagrams & Manuals
333 Type 4 Random Orbit Palm Sander View Diagrams & Manuals
333 Type 5 Random Orbit Palm Sander View Diagrams & Manuals
333VS Type 1 Random Orbit VS Palm Sander View Diagrams & Manuals
333VS Type 2 Random Orbit VS Palm Sander View Diagrams & Manuals
334 Type 1 Random Orbit Palm Sander View Diagrams & Manuals
334 Type 2 Random Orbit Palm Sander View Diagrams & Manuals
334 Type 3 Random Orbit Palm Sander View Diagrams & Manuals
334 Type 4 Random Orbit Palm Sander View Diagrams & Manuals
334 Type 5 Random Orbit Palm Sander View Diagrams & Manuals
343 Type 1 5" Random Orbit Sander View Diagrams & Manuals
343 Type 2 5" Random Orbit Sander View Diagrams & Manuals
344 Type 1 5" PSA Random Orbit Sander View Diagrams & Manuals
344 Type 2 5" PSA Random Orbit Sander View Diagrams & Manuals
343VS Type 1 5" Variable Speed Random Orbit Sander View Diagrams & Manuals
343VS Type 2 5" Variable Speed Random Orbit Sander View Diagrams & Manuals
335 Type 1 6" Random Orbit Sander View Diagrams & Manuals
343K (Type 1) Sander View Diagrams & Manuals
343K (Type 2) Sander View Diagrams & Manuals
343VSK (Type 1) 5 Random Orbit Sander View Diagrams & Manuals
343VSK (Type 2) 5 Random Orbit Sander View Diagrams & Manuals
332K (Type 3) Palm Grip Psa Ros View Diagrams & Manuals
333K (Type 5) 5in Ros W/Sapa Case View Diagrams & Manuals
353 (Type 2) 5in Sander Power Tool View Diagrams & Manuals
J-335 (Type 1) 6in Quicksand R.O.S Power Tool View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Sander Parts
This part replaces obsolete part #: 878198
Repair Videos ?
Watch the Repair Video for
Random Orbit Belt
Articles:
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Belt broken? Learn how to quickly remove and install the clutch drive belt on your Porter Cable sander....
October 08, 2015
|
Customer Part Reviews ?
Average Rating (out of 5):
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5 stars
38
4 stars
8
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2 stars
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Easy repair, works like new
Order filled within a day of ordering, great company to work with. Will use them again
Guest -
September 30, 2023
Verified Purchase
Fit perfect
Parts seem to fit perfectly.
Earle -
August 15, 2023
Verified Purchase
Easy Repair
The shipping cost more than the part. Company provides good schematics so you know what you need and any issues involved (there were none).
Guest -
May 8, 2023
Verified Purchase
I received a belt for a Porter Cable Random Orbital Sander
Getting parts from eReplacement Parts is quicker, better, and less expensive than ordering from Amazon, and the same price you would pay Porter Cable if you would order from them. When I need repair parts for tools or equipment I always go to eReplacement Parts for quick delivery, a reasonable price and information if required. Definitely a great source for repair parts.
Guest -
December 22, 2022
Verified Purchase
easy repair
every item I purchase from eReplacementparts.com have been great products and with a reasonable shipping time, am so glad I found this site
Norman -
November 1, 2022
Verified Purchase
Part fit was great
From placing the order till it arrived customer service was great. They kept me updated to let me know when to expect delivery. Great price for the parts as well
Guest -
October 31, 2022
Verified Purchase
The parts arrived quickly and were easy to install.
My orbital sander works great now - didn't have to buy a new one.
Guest -
October 12, 2022
Verified Purchase
Ordered the part it showed up on time watch the video on how to put it back in Sanders working perfect
Ordered the part it showed up on time watch the video on how to put it back in Sanders working perfect
Anonymous -
August 16, 2022
Verified Purchase
Just the part that I needed
After looking at the page showing the tool and component parts, ordering the correct part was easy. The package arrived in several days, and the tool now works as if new.
Guest -
August 10, 2022
Verified Purchase
Orbital Sander Parts
I was pleased to find I could still get parts for my sander. Finding the part on this web site was very fast. The delivery was on time. Thanks so much.
Patrick -
July 24, 2022
Verified Purchase
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t days ago
Verified Purchase
eReplacementParts Team
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Questions & Answers ?
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Does this fit my product?Questions & Answers for Random Orbit Belt
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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.
The sanding pad was spinning too fast, out of control.
Craig - November 12, 2015
👍 15 of 15 people found this instruction helpful
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Clean excess sawdust from around sanding pad attachment screws. Remove 3 screws attaching pad. Install the new belt on the screw on the plastic base and around the the pad support.
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Belt was broke
Henry - June 24, 2016
👍 4 of 4 people found this instruction helpful
Tool Type
Sander
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1, Removed the pad - 3 screws
2. Clean entire area
3. Installed belt - just walked it on.
4. Reinstalled the pad that was removed in 1.
Make sure the unit is unplugged before starting any repair.
2. Clean entire area
3. Installed belt - just walked it on.
4. Reinstalled the pad that was removed in 1.
Make sure the unit is unplugged before starting any repair.
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Old belt broke
Stephen - June 5, 2016
👍 4 of 4 people found this instruction helpful
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
I took pad off to get to remove the old belt. I then placed the new belt around the belt support, then around the small pulley on the bottom of the housing
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There was a broke belt and a bad bearing on my Porter Cable Random orbit sander and the feet and pad for my Ryobi sander were wore out.
Benian - July 13, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Sander
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Arbor press
1. On the Porter Cable sander I had to remove the bottom housing and the flywheel.
2. I decided after finding so much dust inside the housing to completely disassemble and blow out and clean the inside of the motor.
3. I had to press the bearing out of the flywheel and press the new one in using a bench arbor press.
4. Reassemble the housing and test sander it work like new.
5. On the Ryobi I had to remove the housing to remove the foot for each side.
6. I used compressed air to clean the motor.
7. I inserted the new feet and reassembled the housing.
8. I peeled the pad and cleaned the residue off with mineral spirits.
9. I carefully place the new pad in position and made sure it was properly aligned and that the pad adhered to the base plate.
10. Tested sander and it worked like a new sander.
2. I decided after finding so much dust inside the housing to completely disassemble and blow out and clean the inside of the motor.
3. I had to press the bearing out of the flywheel and press the new one in using a bench arbor press.
4. Reassemble the housing and test sander it work like new.
5. On the Ryobi I had to remove the housing to remove the foot for each side.
6. I used compressed air to clean the motor.
7. I inserted the new feet and reassembled the housing.
8. I peeled the pad and cleaned the residue off with mineral spirits.
9. I carefully place the new pad in position and made sure it was properly aligned and that the pad adhered to the base plate.
10. Tested sander and it worked like a new sander.
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Broken belt and worn out pad
John - June 10, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Unscrew old pad, replace belt and screw on new. Under two minutes
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Drive belt
Robert - September 22, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Remove sanding disc
Put The drive belt around the pad support and the small pulley on the housing
Replace sanding disc
Put The drive belt around the pad support and the small pulley on the housing
Replace sanding disc
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Thanks for voting and helping fellow customers!
Belt was broken
Curt - September 10, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Removed three screws holding sanding pad
2. Removed the sanding pad
3. Removed broken belt
4. Replaced the belt
5. Replaced sanding pad
6. Replaced three screws
2. Removed the sanding pad
3. Removed broken belt
4. Replaced the belt
5. Replaced sanding pad
6. Replaced three screws
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Hook and loop pad was worn out, and the sander wasn't collecting dust.
David - August 13, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
1. Removed the old pad (3 screws)
2. Put the Random Orbit belt in place
3. Placed new pad on and replaced the three screws
4. Turned sander on - worked like a charm!
What was most helpful was your diagnostic suggestions on the web page. I would not have known about the need for the new belt without that.
2. Put the Random Orbit belt in place
3. Placed new pad on and replaced the three screws
4. Turned sander on - worked like a charm!
What was most helpful was your diagnostic suggestions on the web page. I would not have known about the need for the new belt without that.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Broken belt causing over RPM and pad disintegrated
Alan - August 11, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Ordered new belt and pad, removed screws holding old pad, removed old pad and belt under it. Cleaned the area, replaced the belt and reattached three screws.
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Broken belt
Nicholas - July 31, 2018
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Fingers and a screwdriver
Parts Used
Slid the belt around pullies and screwed the Velcro sanding pad on top.
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Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
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.
