Lubricate the piston by putting oil in the air line
use light oil on the hammer section
SOURCE: I have been rebuilding Hitachi
The roofers that frequent my shop want their nailers to work like machine guns. Here is what I do to make the hitachi 45 nail fast. Remove the cylinder and sand the fine scratches where orings meet cylinder. I use a rubber slug with a small bolt through the center. The rubber slug fits snuggly into the cylinder and the bolt into chuck of drill. Turn the cylinder with the drill while holding fine sandpaper against the scratches untill smooth. remove the nose from body and replace the sheet (part # 877125) and the bumper. If the sheet fits loose on the driver and the bumper has cuts or missing pieces, the driver will not return with full force. also the oring on the piston should not be too tight. Just snug enough to hold the weight of the piston. While nose piece is off check the air passage to feed piston for trash, use a small wire and push through to make sure. Make sure the orings on the feed piston fit snug. Actually push the feed piston by hand in the nose piece to make sure the three orings fit snugly. A loose feed piston will reduce nailing speed. Finally replace the boot on the firing pin. If the boot is blown off its seat with use replace the firing pin. A loose firing pin will waste air and lower pressure reducing nailing speed. Good luck
SOURCE: Roofing Nailer driver won't return
I too have a Model RN175 Type 1 which will fire one fastener without
retruing the driver. This Type 1 does not have the selectable trigger
(that allows alternating between single shot and automatic firing). So
the previously posted solution (selector mid-way between SS and AS)
doesn't apply here. I did a rebuild of the body and replaced the
trigger assembly. Still no joy.
I called Porter Cable customers service and technical engineering (888-848-5175 and they suggested check the following items:
1) free movement of the head valve piston and good condition of the spring and o-ring
2)
the condition and position of the check seal. This is a rubber sleeve
with a lip that must slide up onto the anodized cylinder and COVER THE
HOLES. (It has to be installed AFTER the big white plastic cylinder
spacer is installed.)
3) the exhaust port to make sure that there was not trash stuck up in there
4) correct air supply pressure
Turned
out for me that it was item #2 that was my problem. The rubber sleeve
was not stretched up onto the anodized cylinder. This was probably due
to initially hitting something hard when nailiing (blew it out of
position) then my reassembling it incorrectly.
Hope this helps!
Great nail gun, great company, great customer service!
SOURCE: My nail gun will shoot one nail and then stop shooting.
check with one of your friends that have a nowinly good 18v bat if that dont work check for little pieces of plastic or pieces of the nail that are jamed up by the plunger
SOURCE: Paslode finish nailer. Pull trigger
Try the other order, where you depress the gun first, and then pull the trigger.
SOURCE: my makita an451 roof nailer
Nailers that use strips of nails (one nail directly behind the other) will sometimes drive two nails at once and is caused by damage to the driver. The nails are so close together that the driver will hit the first and part of the second nail head. Coil nailers, as your an451, use nails seperated by welded wire making it very difficult the the driver to hit the second nail. Usually when a coil nailer shoots two nails, it is acutally the trigger valve that acutates twice (two very rapid fires). Two very rapid fires is caused by faulty trigger valve. I have seen a roofing coil nailer fire one nail and a second nail drops out of the gun. Caused by weak / malfunction of nail feeder or wire used to weld nails together is too thick.
363 views
Usually answered in minutes!
×