O-rings are made to contain thousands of PSI pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness.
rnrnOf the many causes for O-Ring failure, the most common among power tools are: rn
Extrusion and Nibbling – O-ring has ragged, tattered edges. These are commonly caused by pressure spikes which shear off tiny “bites” from the o-ring, or caused by clearance gaps. rn
Abrasion – One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that it too rough, contains grit or is too smooth to allow lubrication. rn
Over Compression – O-ring is flattened on both sides and may have a “ring” split along its length. Commonly caused by excessive pressure or heat. rn
Heat Hardening – O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity.rn
Weather/Ozone Cracking – O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
This part is at the "heart" of the hammer. I could not find a replacement oring at my local hardware store but ereplacementparts.com had actual Bosch factory parts for my rotary hammer. They fit perfectly and I have confidence that they will last as long as the original parts did.
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Questions & Answers for O-ring
What do I use for new Lube
Donaldasked on 2022-12-18
Hello Donald, thank you for your question. The Correct Lube is 1615430005. This petroleum based grease is used to lubricate the system allowing for easy low friction movement while protecting parts from the usual wear. Please note, this item is sold individually, one 45 ML tube per order. We look forward to hearing from you.
1. Removed and cleaned old grease off all parts
2. Replaced the piston o-ring and re greased everything
3. Noticed the hammer pin seemed tight so greased and loosened it.
4. Put it all back together and it works much better. I think the final hammer pin was the biggest problem since no grease was used when installing bits previously.
1. Pry off the rubber end with a flathead screwdriver.
2.remove the retaining ring. You can do it with some finesse and screwdrivers. Then remove the bit holder assembly. (Spring, ball, washer, etc )
3. Remove the selector switch. Do this by pushing in the red button and turning it beyond the hammer position, then pull out with pliers.
4. Use torx head screwdriver (t-20?)to remove the front housing bolts, then remove housing .
5. Now you'll see the piston/cylinder assembly. Grab the tip of the piston with needle nose pliers and pull it straight up and out of the cylinder.
6.use a pick tool and remove the old o-ring.
7. Grease up the inside of the cylinder and the piston and install the new o-ring onto the piston. Insert the piston into the cylinder.
8. Now is a good time to clean and regrease everything.
9.put the front housing back on and tighten the bolts.
10. Put the bit holder assy back together.
11.put retaining ring back on. A spark plug socket will help, then two screwdrivers. Put rubber top back on.
12. Put selector switch on.
I think that's all that there was to it. If I forgot a step or two, you'll figure it out. Good luck.
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