O-rings are made to contain thousands of PSI pressure by creating a seal between two or more parts. O-ring measurements are specified by the inside diameter and the thickness.
Of the many causes for O-Ring failure, the most common among power tools are:
• <u>Extrusion and Nibbling</u> - 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.
• <u>Abrasion</u> - One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that is too rough, contains grit or is too smooth to allow lubrication.
• <u>Over Compression </u> - O-ring is flattened on both sides and may have a "ring" split along its length. Commonly caused by excessive pressure or heat.
• <u>Heat Hardening</u> - O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity.
• <u>Weather/Ozone Cracking</u> - O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
Trigger assembly is screw in type; Removed retainer and the pin that secures the trigger, removed trigger then used wrench to loosen and remove the trigger assembly.
Disassembled the trigger valve, breather valve, plunger.
Removed and replaced all the o-rings: 1x- 883831, 1x-883935, 2x- 883936, 1x- 883938, 2x- 883848, 1x- 8839
... Read more42, 1x-urethane retainer 890725.
Reinstalled trigger valve assembly.
Air leak is gone, nailer working great!
Drive out roll pin on trigger
(Wrench) Unscrew air valve assembly, Please note how the assembly goes together.
Replace all O-Rings. Most of the O-Rings are easy to find in a assortment set the two small ones on the spool and there is a larger one with a about 1/16\" cross section that are easily available, those I had to orde
... Read morer.
Use the dental pick to remove the O-Rings and re-install the new ones, take care not to over stretch the new ones.
Lube everything with a little o-ring lube or airline oil.
Re-assemble air valve, and screw into gun.
Put trigger switch back in and drive roll pin into place.
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