Question about Hitachi Tools & Hardware - Others

1 Answer

Why won't feed plunger advance nails?

Feed plunger of the NV45ab moves toward piston shaft when air supply is attached but won't advance nails after the first one is fired. Have replaced the o-rings. What is the purpose of the two allen set screws located in the exhaust cover. Will they affect pressure to the gun. Don't want to touch them until I know their purpose.

Posted by on

  • lips0 Jan 25, 2013

    I backed out the two allen set screws in the exhaust cover and the feed plunger mechanism worked. To prove it, I turned the screws (one at a time) all the way back in to the stop point. Each screw blocked the air supply to the feeder assembly. I don't know if there is a correct setting for eac screw but I backed them out to the point where the gun worked correctly. Does anyone know the correct set point for these screws or how they are supposed to be adjusted?

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Hitachi Master
  • 1,388 Answers

The two hex head screws on the very top of the head hold the air deflector and attach to the headvalve (the part inside the head with rubber coating, this headvalve has a gasket under that should be check for proper alignment ). Other small screws that look like set screw are only plugs that are removed to install auto control hoses in factory work. These are only plugs so just put them in a few turns with locktite.

Posted on Jan 31, 2013

Ad

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 16 Answers

SOURCE: DeWalt Frame Nailer 51844 extends firing pin when air hose attach

Check whether the trigger is working properly, and whether the air valve is not leaking.

Posted on Jun 15, 2009

rowdy45176
  • 2176 Answers

SOURCE: Dewalt 51488. Air leaks around trigger and won't fire nail.

Go to Dewaltservicenet.com and download a breakdown of the tool before starting. I would recoment changing all the O rings and make sure that you get a good grease to lube them first. Its not that hard.

Posted on Jul 17, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do I fix dont feeding the nail


The Bostitch rn46 is a very good nailer however suffers from the problem that you are experiencing. Easy to fix. Remove the nails and connect to air pressure (100psi). With side door open and trigger depressed, cycle the gun against old coiled rubber hose or soft wood. As you cycle the gun, check that the feeder is moving back and forward with speed and the driver is moving down then up again. If the feeder seems to move in slow motion back and forth the air passage that feeds air to the feed piston is restricted or oring/spring to feed piston is worn. If the feeder moves very fast then suspect worn driver oring. To check driver oring, remove nails and air supply and leave open side door. Point nose of gun up then down to see if the driver seems loose and is moving up and down the cylinder. When the driver oring is good, the driver will stay at the top of the cylinder. If the driver oring seems ok and the feeder moves very fast then suspect feeder spring weak or missing. I usually find that debris from lower bumper and driver piston oring shavings have entered/clogged the air passage to feed piston. Replace parts as needed. Good luck.

Feb 21, 2015 | Stanley Factory Reconditioned Bostitch...

1 Answer

Roofing coil nailer will not advance nails


The feeder piston should be very hard to retract by hand and should move back and forth as quickly as driver piston moves. With nails removed and side door open, activate gun on rubber surface (old coiled up air hose or water hose ) and make sure driver and feeder move quickly. If not check for debris within feed piston or air passage to feedpiston. The spring straddles the feeder with the slightly bent part of the spring arms contacting the upper surface of the feeder (little grooves cut into feeder). When installed correctly, the tip of the spring arms will be pointing upwards and the back part of the spring between the two loops will be contacting the feeder shaft. Good luck.

Jun 25, 2013 | Porter Cable Air Tools & Compressors

2 Answers

Nv45ab won't advance nails


The allen screw/s that you mention are there to plug holes where automatic equipment would normally connect (such as automatic nailing machines) . This is only a plug and should not be driven in too far. I have also seen allen screws installed in the head to repair small crack/s.

Jan 22, 2013 | Hitachi Air Tools & Compressors

1 Answer

Hitachi NV45AB won't advance nails


This problem could be caused by the head gasket fliped the wrong way not sealing small hole in the body. Also the head valve gasket (small round gasket between headvalve and head) could be place with vent hole mis-aligned. Check these two items and post again.

Jan 22, 2013 | Air Tools & Compressors

2 Answers

I have a porter cable roofing nailer model # RN175 that does not advance the nails everytime what causes this?


Some causes, in order of probability:
Roofing nailers get a lot of tar build up on them, especially around the nose safety and nail feed pawl area. Cleaning off this buildup will usually take care of most problems with roofing nailers.
On the side of the gun away from the side you load the nails on there is a small cylinder with a piston inside that attaches to the feeder pawl. If air isn't getting to the piston or the piston's o-ring or spring is damaged, it won't cycle properly to advance the nails.
If the driver doesn't retract fully, the next nail won't be able to advance properly for the next shot. This can be caused by o-rings in the head that are worn or out of their proper place.

Oct 06, 2012 | Air Tools & Compressors

1 Answer

My Bostitch N12 won't advance nails


It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.

May 16, 2012 | Stanley Air Tools & Compressors

1 Answer

Bostitch RN46-1 roof nailer won't advance nails into the piston chamber. After loading the nail coil, the first nail fires fine, but the next won't advance. Please help. Thanks!


check the height of the magazine, but I think that you have a problem with the feed piston or there is a spring on the feed pawl that might be broke. Unload the nails and dry fire the tool with the door open observing the piston movement. It should "SNAP" back and forth if it does unplug the air and check to see if the spring that applies pressure to the pawl is broken or missing. I am going to guess the piston. If this tool has not been serviced in a while the asphalt tends to jam up the mechanisms. Let me know if you need more assistance.

Jun 12, 2011 | Tools & Hardware - Others

1 Answer

SENCO ROOFING NAILER DOESNOT ADVANCE NAILS CONTINOUSLY


you have one of a couple problems. First the piston is not moving freely to advance the nails, the magazine might not be set for the nails being used, or the collation is not correct, or the feed pawl spring is broken, and the driver might not be retracting fully to allow the next nail to feed. What I would do is remove all the nails, and get a block of wood and open the door that holds the nails in place and look for free movement on the feed pistion and how the driver is functioning. If all appears OK unplug the air and check the spring on the feed pawl, also check to make sure not gummed up from asphalt, If the feed piston is not snapping it could be an oring or debris in the air hole feeding into it. Let me know if you need more assistance.

Apr 05, 2011 | Senco Tools & Hardware - Others

2 Answers

I have a SCN40R gun that doesn't advance the nails in the coil part. What could be the problem. The part that is suppose to advance the next nail doesn't move.


The feed pawl is moved by a piston that extends from a cylinder on the lower side of the guide body. There are a couple seals inside the cylinder that if damaged will not hold enough air to activate the piston and advance the next nail. The two seals are Senco part number LB0828 & LB0845. Better yet get a Senco YK0369 repair kit and replace all of your o-rings, you'll have a like new gun for around $60.

Jan 06, 2011 | Senco Air Tools & Compressors

1 Answer

My N12 stops feeding after every 2 or 3 nail.


could be a few problems, are you using the right nails with the proper collation. is the magazine set correctly for the nail size, is the piston retracting fully to advance the next nail, and is the feed pawl spring broken and or is the feed pawl moving freely, to check the last one remove all nails and open the door that would guide the nails and fire the tool and look at the feed mechanism to make sure working properly, sometimes the bumper starts to disintegrate and pieces get stuck in the air hole controlling the feed. Let me know if you need more clarification or help

Nov 29, 2010 | Stanley Bostitch N12 Coil Nailer...

Not finding what you are looking for?
Tools & Hardware - Others Logo

Related Topics:

245 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Tools & Hardware - Others Experts

John Trevino

Level 3 Expert

1388 Answers

yoopertech

Level 2 Expert

131 Answers

Joe Garcia
Joe Garcia

Level 2 Expert

205 Answers

Are you a Hitachi Tool and Hardware - Other Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...