Question about Porter Cable 1" 18 Gauge Brad Nails [Misc.]

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Driver not moving up to fire position

I have broken a plastic peice probably from hitting it to get the plunger to move to the up position. why will the plunger (driver) not move to the up position.

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Dont have your model number but can come up with a few ideas. First the driver blade might be bent, the piston ring/cylinder might be scored or just dry and can't move freely and you could possibly have a nail jammed in the magazine restricting movement. Get back to me with the model number and I will look at a breakdown and see if I can find anything else. Also have you taken the tool apart? Let me know

Posted on Jan 21, 2009

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If air is leaking from the trigger, check vinyl ball and oring on the white plastic firing pin. If air seems to leak from the plunger just in front of the trigger (with air connected and nails removed move plunger with finger and listen for change in sound), remove the head and pull out the cylinder. The outer oring to the plate around the cylinder is bad, however, clean the cylinder and lube with white grease. Good luck

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My Bostitch MIII floor stapler is not driving staples. I partially drove one staple with a glancing blow then drove another on top. I cleared the jam and now it will not feed staples; It fires...

Slight damage to driver will prevent it from returning to top of cylinder (assuming that nailer worked correctly before double fire). Easy to check. Remove airline. Use metal or plastic to push driver to top of cylinder (should easily move). After the driver is at top, see if first cleat moved into proper positon. If cleat is not in position, check pusher and rails for debris. If cleat is in position, activate nailer to check for proper function. If driver does not return to top of cylinder and was difficult to push up, pull out driver and check for bent /damaged driver and replace orings and lower bumper while apart if parts look worn. Good luck

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Low pressure or worn piston orings will cause missfire due to the piston/driver not returning to top of cylinder and not allowing pins to move into position. Easy test. Remove airline and push driver blade all the way to top with thin metal or plastic. Test fire. If ok and pressure to gun aprox 100psi, install rebuild/oring kit. If driver was already at top position and the next pin is not aligned with path of driver, check rails and pusher for debris or obstruction preventing pins from moving into position.

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My hitachi nv45ab double fires

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My finish nailer will not shoot fireing plunger does not go back up when fired

The driver attaches to a piston. If the driver has broken it will not return up it is either broken off the piston or an o-ring has went bad around the cylinder. After firing these o-rings direct a shot of air under the pist so it moves back up. What make of gun do you have?

Nov 17, 2009 | Senco Tools & Hardware - Others

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How do I fix the plunger ?

This can be caused by any number of reasons.

If your piston driver does retract and slowly slides back to the downward position. This is a good indication that your piston o-ring is worn and needs replacing.

However the most common cause of the problem in which the driver will not retract at all, is that an o-ring has broken or has popped off of your piston cylinder. This o-ring is located in the bottom chamber of the gun.

Generally if the tool has not had the o-rings replaced in over a year, and if the tool is used quite often, it is good to have all the o-rings replaced especially when they are in contact with moving parts. Also as a rule, if you are unfamiliar with pneumatic tool repair, remove only the parts necessary to your problem. Often one problem can compound to many if you interfere with parts that are working properly.

To make a quick repair take following steps:

Disconnect the tool from air supply.

Remove the head cap from the body by removing the 4 bolts on the top. Be careful not to tear the gasket if you do not have a replacement.

With a thin tool pop the piston driver out of the top, by pushing upwards from the nose end.

If tool has dirt, excess oil, or grit inside clean it up as much as possible especially around rubber o-rings. Keep in mind that the tool needs oil to remain lubricated, don't leave tool dry around o-rings.

Use two head cap screws to gently remove the cylinder plate that is now exposed around the piston cylinder. Gently pull upwards (friction and an o-ring hold this tightly in place).

Now you can remove the piston cylinder. It may pop up because it is spring loaded, or it may be stuck downward. Carefully work it loose so it can be removed.

Examine the o-rings on the cylinder. Are any out of position? If there are any broken they must be replaced. If one popped out of position, reposition it.

The o-ring that can cause this problem is most likely the large rubber ring that covers a series of smaller holes that are positioned around middle portion of the cylinder.

Replace parts in the reverse manner of removal. Lubricate o-rings with appropriate assembly grease which is best, or pneumatic tool oil.

When the cylinder plate is reassembled, make sure that the cylinder is up. In other words, the spring that is surrounding the cylinder below the plate must be released as much as possible. This will enable flush contact between the cylinder and the parts on the head cap when the tool is assembled fully.

Replace the gasket, head cap, and the four bolts.

Hook tool up to air supply, check for air leaks, test fire tool.

Apr 12, 2009 | Hitachi NR83A2 2" To 3 1/4" Full Head...

2 Answers

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!

Mar 14, 2009 | Porter Cable RN175 Roofing Coil Nailer

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