I have not been able to purchase replacement parts for these nail guns , however, have repaired them using parts from Bostitch framers and or just make the part. If the seal fits over the top of the cylinder, then try using seal from Bostitch framer part #N70155 fits a bit tight but works. Heat with a hair dryer to soften and install. If the seat is incorporated within the head valve, just dig it out and replace it with liquid two part urethane. Just mix and pour it in. After cleaning out the old seal, place head valve on level surface and pour in the mixed urethane till slightly over full to give the seal a nice crown. The finish nailer might also be repaired using other brand of seals. Remove the old part and take it to service center for a possible match. Good luck with your repair.
replace the seals that keeps the air gun tight , replace parts on gun if to much trouble get a new one here or same exact brand at www.procellularservices.com
SOURCE: harbor freight central pneumatic finish nailer 34 degree #61887 not firing can not find manual
For technical questions, please call 1-888-866-5797.
https://manuals.harborfreight.com/manuals/61000-61999/61887.pdf
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