Question about RTO PasLode 900420 Impulse Framing Nailer

5 Answers

Paslode Framing Nailer Repair

I disassembled the gun to clean and repair, I can't remember what position the pins (404827) go in respect to the spring (404411). Do they slide through the spring at the end near the bumper or midway through the spring. I also haven't been getting spark, I had to replace the wiring harness (900475) due to one of the contact ears breaking off. I bought the gun used and I haven't been able to get it to fire yet. Should I replace the spark plug or the entire spark unit assembly, how often do the assemblies go out and is there any way to test the assembly. Thank you. Jason.

Posted by on

  • jpmach1 Jan 26, 2009

    Thanks for the help Rowdy, I did as you said with the spark situation and I still do not have any spark. The LED and fan work, but no spark. I need to check the continuity of the wire, it looks fine but I'll check it tomorrow. Do those pins go through the end of the spring near the bumpers or should I push the assembly together and put them about midway through the spring? I bought the gun for $60 at an auction I figured I can put some money into it and still be ahead, hopefully not too much cash though. Thanks again rowdy.



5 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 6 Answers

Hi jason hows it going m8. right first of the rebuild u should have 3 main parts combustion chamber 404407, upper probe 901249 and nail chamber 404436. first place 901249 the 2 springs and the rubber stops onto 404436, put some paslode oil around the oring at the top of this part then slide the assembly inside 404407 hold the 901249 upper probe and push it up u should be able to put the pins through they don't touch the springs they go under the lugs at the top of the upper probe. now to get it fireing with the barrel assembaly of the gun you should be able to see the fan now be carefull as this can be dodgy. if u look at the moided circuit assem 900475 u will see a switch at the top this tells the gun its ok to fire its a saftey switch. if u put a battery in the gun and carfully hold down this switch mind when u hold the switch down the fan will start then pull the trigger u should see a spark at the spark plug assembaly if not unplug the pink wire and hold a screw driver next to the plug. if you get a spark great if not check the pink wire going to the spark plug is ok and pushed firmly into the spark unit 900474. this should solve your problems and hope i have helped. let me know how u get on with the gun.


Posted on Jun 24, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hey rowdy45176

ive got a kink in my pink cable to the spark unit i can it clicking but cant always see a spark and never fires was wondering what u thought ???

Posted on Mar 04, 2010

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have a paselode finnish nailer im250-f16 11, when applied to wood surface and trigger pulled the gun does nothing, fan will not go on or shoot a nail. I cleaned the gun and still nothing, need help thanks.

Posted on Nov 30, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.

    New Friend:

    An expert that has 1 follower.


    An expert who has answered 20 questions.

  • Expert
  • 131 Answers

Check to see if the red wire going to spark assembly is loose. You must hit the top head swirch and then the trigger switch in that order to get a spark. Do you need a parts breakdown?

Posted on Jun 30, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 2,176 Answers

The pins you refer to go in after you push up on the yoke that connects to the work contact. What you need to do is put the bumpers on top of the sleeve you will see where they sit and the springs on either side holding them in place with one hand so they don't go flying and push the sleeve assembly into the combustion chamber, you might have to push up on the yoke some so it fits or squeeze it as it enters. Push this assembly and while holding together put the pins in either side. Them what I do is pull them apart so make sure the unit retracts properly. Now for the spark, you replaced the electronic unit and no spark, You want to make sure that all the wires and connectors are properly inserted including the spark plug wire. With the unit apart insert battery and watching out for fan pull the trigger, the fan should run and go off after a few seconds. Then you will see under the motor/top area a roller and lever push on the lever, again watching out for fan and it should do as above, Now to check the spark unit push and hold the roller lever and squeeze the trigger and you should see and hear spark. release all these and do again. If no spark it could be the spark unit (around 90.00) or the wire could be bad. These spark units are designed to last a long time. If you bought this used I hope that the person was not a friend ( just kidding). Let me know what happens

Posted on Jan 23, 2009

  • David Ford
    David Ford Jan 29, 2009

    When you push the sleeve into the combustion chamger they go on the outside of the rail that connects to lower probe.. Check for a break in the wire that would go to ground on the spark unit and also look at the plug for a crack allowing the spark to ground. Good luck


1 Suggested Answer

  • 2 Answers

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

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.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My Impulse Framing Nailer fan doesn't go on when i press down on the gun


Here is a tip that I wrote about the Paslode nailers and the problems that can come up with them.

I also have a link to the Paslode manuals which contain Paslode cleaning and troubleshooting guides.

If you need parts for your Paslode, there also is a link for a site that sells the Paslode nailer parts.

Paslode Cordless Nailer Problems



Apr 11, 2010 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Paslode framing nailer will onley fire one time and wont return to fireing pos. fires first nail great . started this problem after cleaning

Did you remember to lube the upper cylinder, lg 0-ring and silicone the striking pin----sticking may prevent returning to firing position

Mar 05, 2010 | RTO PasLode 900420 Impulse Framing Nailer

2 Answers

I dropped my Paslode F350S framing nailer on concrete and it has a pin hole air leak in the outer casting. Where can I get a replacement outer shell? Also can a pin hole air leak be repaired? The nailer is...

You will have to take it to your nearest paslode repair agent(check for your nearest repairer on the paslode web site). It sound like you have damaged cylinder or comb. chamber. the orange casing is just that a casing to hold the internals together. The gas framing gun is just like your car motor. Fuel(gas cell),spark(spark plug), motor(piston moving up and down a cylider) and filter/air( fan to move air around evenly and filter for tool to breath)

Dec 22, 2009 | RTO PasLode 900420 Impulse Framing Nailer

2 Answers

Fan wont shaut off

try a doing a complete cleaning using Paslode cleaner or electrical contact cleaner.

Most problems with the impluse guns are result of them being dirty.

Oct 14, 2009 | RTO PasLode 900420 Impulse Framing Nailer

2 Answers

I can't put mt paslode finish nailer back together again

go to and you can download a manual that shows the spring. It sits in a recess under the follower that pushes the nails

Jul 20, 2009 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Paslode cordless framing nailer model 325 (black)

the fan is what returns the valve in the chamber, whilst it may have been lubed it must be spotless in the chamber. Use paslode gun cleaner a clean cloth and the handle of a wooden spoon or similar and clean all residue and grime out of chamber and re lube. Or you just have a dead tool that was used for parts! good luck

May 08, 2009 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Paslode 900420 piece fell out

Be sure to remove the metal nose piece that covers the lockout bar when assembled. It may be stuck to the other half of the gun. Replace the bar and the spring and put the metal nose piece in its position over the lockout bar. At this point the metal nose piece will be on the opposite side. This will allow you to replace the 2 halves carefully so as not to loose the spring.

Apr 23, 2009 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Paslode framing nailer loss of power.

Here's what I found at the Paslode Troubleshooting Site:
Tool will not cycle - fan runs, indicator light
is solid green.

Lockout bracket is stuck in lockout position.
Work-contacting element is bent, or build-up of
debris in track restricts operation.
Follower is not behind fasteners.
Fuel Cell empty.
Spark wire out of spark plug.
Spark plug is dirty.
No spark is generated.
Check lockout.

Remove and inspect lower probe. Clean and
lubricate track with Paslode Impulse® oil.
Repair or replace lower probe as required.
Position follower behind fasteners.
Replace fuel cell.
Remove cap and check spark lead, insert in
spark plug and replace cover.
Clean tool cylinder head and spark plug.

If this doesn't work, I suggest contacting Paslode directly 800-222-6990

Mar 11, 2009 | RTO PasLode 900420 Impulse Framing Nailer

Not finding what you are looking for?
RTO PasLode 900420 Impulse Framing Nailer  Logo

5,585 people viewed this question

Ask a Question

Usually answered in minutes!

Top RTO Air Tools & Compressors Experts


Level 2 Expert

131 Answers

John Trevino

Level 3 Expert

1388 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a RTO Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides