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
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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
This item works with the following types of products:
- Sander Parts
This part replaces obsolete part #: 878198
Repair Videos ?
Belt broken? Learn how to quickly remove and install the clutch drive belt on your Porter Cable sander....
October 08, 2015
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Customer Part Reviews ?
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Questions & Answers ?
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Does this fit my product?Questions & Answers for Random Orbit Belt
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.
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Belt was broke
Tool Type
Sander
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
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.
Old belt broke
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
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.
Tool Type
Sander
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Arbor press
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.
Broken belt and worn out pad
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Drive belt
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Put The drive belt around the pad support and the small pulley on the housing
Replace sanding disc
Belt was broken
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
2. Removed the sanding pad
3. Removed broken belt
4. Replaced the belt
5. Replaced sanding pad
6. Replaced three screws
Hook and loop pad was worn out, and the sander wasn't collecting dust.
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
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.
Broken belt causing over RPM and pad disintegrated
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Broken belt
Tool Type
Sander
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Fingers and a screwdriver
Parts Used
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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.