Part Location Diagram of 393749-01 DeWALT O-ring
See part 70 in the diagram
( Grid squares measure 1x1 inch )

O-ring 393749-01

Manufactured by:
DeWALT
ERP Number:
ERP10171616
Part Number:
393749-01
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

15 - 30 mins 

(6 rated repairs) ?

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Product Description

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It is a genuine manufacturer sourced replacement part designed for Dewalt belt sanders. This o-ring provides an air-tight seal for the shroud, for correct application make sure to check appropriate diagrams of your equipment. Over time seals and o-rings may shrink, become brittle and crack eventually requiring replacement to maintain peak performance. It is made from durable polymer material and it is sold individually.

Troubleshooting

This part works with the following brands:
  • DeWALT
This part works with the following products:
  • Sander Polisher

Customer Part Reviews

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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.

Easy 

15 - 30 mins 

(6 rated repairs) ?
  • 1
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Belt drive for dust catcher. The Dewalt manual calls it an o-ring, but really is a small belt that looks like an o ring!

jeff from Woodbury, Minnesota

5 of 5 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
393749-01
1, Removed belt cover, removed main drive belt to reach fan belt.
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No saw dust extraction

michael from apex, North Carolina

4 of 4 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
398082-00, 398072-00, 393749-01
Took off large yellow housing containing the drive mechanism. Noticed the \"Belt\" \"O\" ring was missing. This meant the fan had no power and therefore no sawdust extraction. Replaced o ring after making sure there were no burrs present where it seated. It takes a little patience and leverage to get the belt on but its doable. Install ed the protective cover and off you go.
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The blower stop working

Angel from Hopewell jct, New York

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
949638-02, 393749-01
Remove the outer cap to the vacuum and then there was additional belt drive on top , slide it off . Install the clear gasket ring and then install the belt dive as well and test it to make sure it work. And place the outer cover back plus screw .
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BROKE ORING

james from GARYSBURG, North Carolina

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
393749-01
REMOVED THE COVER AND REPLACED THE BELT
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Belt sander would not exhaust sanding dust

Tom from Evans, Georgia

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
393749-01
1. Removed the cover that has the sanding dust exhaust port - 5 screws; Torx 20 or straight blade screwdriver.
2. Removed the cover.
3. Removed the motor drive belt. It has splines. Rotate the pulleys as you pull up on the belt and it will come off easily. Take care; it will pinch your fingers if caught between the belt and pu lleys.
4. Remove the old dust exhaust port o-ring. It may already be broken, as mine was.
5. Install the o-ring. It will be obvious where it attaches to the dust exhaust port squirrel fan and on the smaller motor drive belt pulley.
6. Reinstall the motor drive belt. If you put it around the larger pulley first, and then the smaller pulley, turning the pulleys as you slip the belt on, it\'s pretty easy.
7. Reinstall the cover. The screws should be snug, but don\'t over tighten and strip the plastic threads in the body.
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Drive wheel was mangled, drive shaft was broken, o-ring for blower stretched waaaaay out.

Bryan from ZIONSVILLE, Indiana

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Wrench (Adjustable)
Parts Used:
N174784, 393749-01
Printed out the parts diagram. You need to remove nearly every screw. You do not need to remove the plastic housing over the motor brushes.

Remove the 5 T-20\'s holding the cover plate over the dust-port side.
Remove the o-ring and the drive belt.
Remove the T-20 screws holding the handle on.
Remove the hand le. Take a picture so you know where the wires go. You do _not_ need to unplug the switch or muddle with wires.
Remove the T-20 screws holding the cast body together. There are two long ones with nuts on the front of the tool. The rest screw into posts. Make sure you get them all. There\'s a couple that like to hide where the handle was, and where the tension adjustment are.
I seem to recall needing to remove the tensioning lever, and removing the front roller assembly. There were a couple of screws on the roller assembly, and a nut that I used a monkey wrench on.

Remove the drive wheel. The nut that holds it on is reverse threaded. If you can jamb the drive shaft from moving you can turn the wheel clockwise and the nut will free. The wheel should come off pretty easily too.

Separate everything very carefully. Don\'t pry hard. You can crack a casting if you forgot or missed a screw. There are some pry-points in the castings to make separation easy.

Remove the drive shaft (you don\'t have to remove a bearing!), set the new one in, grease things (if you need to) re-seal and put things back together. :-)

I accidentally pried too hard, before getting all the screws out, and broke the casting. Luckily it took a nice clean hole right around the screw head, and I was able to use a washer around the screw head and some J-B weld to make a reasonably solid repair that set quickly and I was able to file things down to the same level they used to be. The tool operates just as well (if not better) than it did before.

I\'d also recommend blowing everything out with compressed air as you go. Wear a mask for that. It\'s a mess in a sander.
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