This O-ring is compatible with various models of compressors made by DeWALT, Black & Decker, and Bostitch. It is an authentic replacement part from original manufacturer. An O-ring is used to prevent pressure loss between joined rigid parts by creating a seal. Many tools require working O-rings in order to function. Please check that the correct O-ring is being used in the correct position, as many tools use multiple different O-rings throughout. Sold individually.
Took apart and put new cylinder sleeve in, re-installed the piston and rod, put o-ring on cylinder plate, o-ring on head and re-installed them. Then hooked up air line to tank. Intallled filter and plugged in. Watched for pressure building. Worked well.
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Dewalt 200 PSI compressor would not build up pressure. After removing cover noted one of the four head bolts was broken and the o-ring was protruding a bit.
1. Removed plastic cover with torx driver bits.
2. Removed head cover by removing the 3 remaining bolts.
3. Drilled out broken bolt.
4. Replaced the two internal o-rings on either side of head cover.
5. Installed head cover using 4 bolts (used loctite to keep bolts from backing out during operation).
6. Re-in
... Read morestalled cover.
7. Restarted compressor. No problems.
Two head bolts were broken off so I had to drill them out and clean up all of the threads in order to put the unit back together, this was the hard part. Once that was done all I had to do was reassemble the unit back together and clean up some wire problems. Then after that did a test run and also found the pressure switch was turned up
... Read moreto full so that the compressor would not shut off yet at 200 lbs, so I turned that down so that the unit would turn off at 160 lbs and on at 120 lbs, then set the regulator to deliver air to the tools at 100 lbs. unit now runs great.
Removed main cover
Removed casing torque screws
Removed 4 bolts holding compressor body- had to easy out broken bolt
Replaced both gaskets
Put back together and tested pressure
Works like new-$15 with postage saved me buying a new $400 compressor
Removed the shroud
Removed the broken bolt from the cylinder head
Removed the cylinder head and the valve plate assembly
Removed the old o-ring and installed the new o-ring
Replaced the valve plate assembly
Replaced the cylinder head
Replaced the shroud
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Model Cross Reference
This part works with the following models:
ERP Number: ERP18990606
Manufacturer Part Number: A03856
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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Mail-In Recycling Rebate
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.
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