Author Topic: Paint leaks from fuji hvlp air diffuser  (Read 3807 times)

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Offline usatu

  • Posts: 121
Paint leaks from fuji hvlp air diffuser
« on: February 01, 2017, 08:52 PM »
Hi-experts,

While I am still figuring out my finish problems, I keep getting paint drips from one side of air diffuser and one side of air cap also got paint on it. Through manual, I thought it is caused by needle packing nut. Apparently that's not the cause. Please advise if you know the solution.

Another issue is I probably loose the needle packing nut too much and now got a leak in the nut when I pull the trigger. I remembered that needle packing nut's gaps positioned horizontally. If you have the T series gun, can you please help me look?

Thank you so much!

Festool USA does not pre-approve the contents of this website nor endorse the application or use of any Festool product in any way other than in the manner described in the Festool Instruction Manual. To reduce the risk of serious injury and/or damage to your Festool product, always read, understand and follow all warnings and instructions in your Festool product's Instruction Manual. Although Festool strives for accuracy in the website material, the website may contain inaccuracies. Festool makes no representations about the accuracy, reliability, completeness or timeliness of the material on this website or about the results to be obtained from using the website. Festool and its affiliates cannot be responsible for improper postings or your reliance on the website's material. Your use of any material contained on this website is entirely at your own risk. The content contained on this site is provided for informational purposes only and does not constitute professional advice.


Offline Tim Raleigh

  • Posts: 3409
    • Oakville Cabinetry
Re: Paint leaks from fuji hvlp air diffuser
« Reply #1 on: February 01, 2017, 09:04 PM »
Photo's please.
Tim

Offline tjbnwi

  • Posts: 4754
  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #2 on: February 01, 2017, 09:07 PM »
Tighten the packing nut one quarter turn at a time until the leak stops. Make sure the needle moves freely.

Check the back of the air cap, there may be a little paint/finish on it. Make sure you put the air diffuser back in the gun last time you cleaned it.

Tom

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #3 on: February 01, 2017, 09:22 PM »
Photo's please.
Tim

I will do it tomorrow. It is the bottom part that leaks.

Offline tjbnwi

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Re: Paint leaks from fuji hvlp air diffuser
« Reply #4 on: February 01, 2017, 09:26 PM »
Sounds like you forgot the nylon seal.

Tom

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #5 on: February 01, 2017, 09:29 PM »
Will try tomorrow. I cleaned everything and put it back and still got leaks before I touched needle packing nut. According to manual, LEAKAGE FROM THE NOZZLE
This occurs when the Needle Packing Nut is too tight compressing
the Needle Packing #12 tightly around the Needle.
But I found is big leaks come from the diffuser holes and a tiny bead of paint on nozzle and needle tip after pulling the trigger. So I am not sure manual tells the solution on that.

Tighten the packing nut one quarter turn at a time until the leak stops. Make sure the needle moves freely.

Check the back of the air cap, there may be a little paint/finish on it. Make sure you put the air diffuser back in the gun last time you cleaned it.

Tom

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #6 on: February 01, 2017, 09:30 PM »
2 plastic rings? I put those on.
Sounds like you forgot the nylon seal.

Tom

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #7 on: February 01, 2017, 09:50 PM »
Packing nuts don't need to be removed for normal cleaning only if replacing it.

A paint leaking from the air diffuser means that your nozzle is leaking from its threads to the diffuser.
« Last Edit: February 01, 2017, 09:57 PM by wptski »
Bill
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Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #8 on: February 01, 2017, 10:08 PM »
Packing nuts don't need to be removed for normal cleaning only if replacing it.

A paint leaking from the air diffuser means that your nozzle is leaking from its threads to the diffuser.

Does that mean tighten the nozzle more?

Offline tjbnwi

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  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #9 on: February 01, 2017, 10:09 PM »
Loosen the nozzle and reseat it.

Paint moves from the cup, into the fluid chamber and out the nozzle into the air stream. If everything is correct no fluid ever enters the air chamber in the gun body. As Bill stated, the fluid has to be coming from the nozzle to body area.

Check the clock on the diffuser, make sure it's set on the pin properly.

Tom

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #10 on: February 02, 2017, 06:32 AM »
Does that mean tighten the nozzle more?
Maybe, there isn't a seal of any kind on the nozzle as it just relies a on a tiny shoulder to seat properly and seal.

Here's a video from Fuji that may help you.

 
Bill
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Offline tjbnwi

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Re: Paint leaks from fuji hvlp air diffuser
« Reply #11 on: February 02, 2017, 10:27 AM »
There is no seal nozzle to buy. It is a seat fit.

Tom

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #12 on: February 02, 2017, 12:24 PM »
There is no seal nozzle to buy. It is a seat fit.

Tom
Yes, it relies on its threads and a slight shoulder to butt up against.
Bill
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Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #13 on: February 02, 2017, 05:15 PM »
Tried a different nozzle and still get the same problem. But if I remove air diffuser and put nozzle on , no water leaks. So I am not sure whether it is the plastic ring on air diffuser going bad. I also can hear air leaking sound from the cup.

There is no seal nozzle to buy. It is a seat fit.

Tom
Yes, it relies on its threads and a slight shoulder to butt up against.

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #14 on: February 02, 2017, 08:02 PM »
Tried a different nozzle and still get the same problem. But if I remove air diffuser and put nozzle on , no water leaks. So I am not sure whether it is the plastic ring on air diffuser going bad. I also can hear air leaking sound from the cup.
I don't have a T-70 to play along here but it seems that the air diffuser is part of your air path to the air cap not the product being sprayed "unless" it's stopping the nozzle from sitting properly and therefore leaking.  The nozzle has to be removed before the diffuser and divider as the video shows.

Maybe Tom or Tim can answer as they both have a T-70?   
Bill
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Offline Tim Raleigh

  • Posts: 3409
    • Oakville Cabinetry
Re: Paint leaks from fuji hvlp air diffuser
« Reply #15 on: February 02, 2017, 10:25 PM »
Tried a different nozzle and still get the same problem. But if I remove air diffuser and put nozzle on , no water leaks. So I am not sure whether it is the plastic ring on air diffuser going bad. I also can hear air leaking sound from the cup.

I still need pictures of your gun and cup and those areas that you think are leaking.
Tim

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #16 on: February 03, 2017, 08:23 AM »
Sorry,only have one with water dripping. Thanks

Offline JCLP

  • Posts: 644
Re: Paint leaks from fuji hvlp air diffuser
« Reply #17 on: February 03, 2017, 09:22 AM »
From the picture I see a couple of things.
First, replace the check valve tube. The inside looks dirty. Both tubes and valve.
Second, you need to tighten the fluid nozzle as tight as you can. This should prevent any leakage that you are getting.
Thirdly, you may want to replace the diffuser seal.
Fourthly, make sure when you tighten the metal collar as well.

Cheers,
JC


Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #18 on: February 03, 2017, 10:01 AM »
From the picture I see a couple of things.
First, replace the check valve tube. The inside looks dirty. Both tubes and valve.
Second, you need to tighten the fluid nozzle as tight as you can. This should prevent any leakage that you are getting.
Thirdly, you may want to replace the diffuser seal.
Fourthly, make sure when you tighten the metal collar as well.

Cheers,
JC
Yeah, looks like water inside the tube or is that just on the outside?  Is the hole in the cup baffle positioned for the angle your using it?  If that's wrong plus a bad check valve, you's get the product or water in this case in your air passage ways.
Bill
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Offline Tim Raleigh

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    • Oakville Cabinetry
Re: Paint leaks from fuji hvlp air diffuser
« Reply #19 on: February 03, 2017, 10:08 AM »
Sorry,only have one with water dripping. Thanks

Thanks.
Can you take a picture of the inside of the gun where the nozzle threads into the gun and the individual parts.
It appears the leak is coming from the fluid nozzle and it needs to be tightened, but it may be that the thread is clogged with finish and preventing a proper seal. Don't over tighten the nozzle.
It could be the check valve is leaking, but usually that creates intermitment problems not a consistent stream.
Tim

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #20 on: February 03, 2017, 05:38 PM »
I will do pictures tomorrow. The gun is not with me. I cleaned the tread really well after the leaks happened. If the treading is not sealing well,it should leak after I put the nozzle on without air diffuser,right? I am getting a rebuild kit to replace the parts.

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #21 on: February 07, 2017, 09:57 PM »
I got the rebuilt kit yesterday and after changing two plastic rings , it stopped leaking. But it started again today. Also the  cup bubbles too. Pls see pictures.

The flex tube leaks too as the front has a small cut. Tried to wrap in gas line seal tape. Wondering whether I can cut off that part and attach t the rest back  to connector?

Thanks

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #22 on: February 07, 2017, 10:22 PM »
If the tube is cracked just cut off the area, no problem as long as it reaches it's fine.

You might try one wrap of some Teflon tape on the nozzle threads.
Bill
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Offline brewster201

  • Posts: 43
Re: Paint leaks from fuji hvlp air diffuser
« Reply #23 on: February 08, 2017, 07:32 AM »
Hello it appears to me that you have the fluid adjust open way too much and it is not atomizing properly. The excess is running down the tip. Try reducing to about 3 turns open and try again. What is the size of the nozzle/needle set?
Also replace the check valve on the hose, if it is plugged you will not pressure up the paint cup, cut out the bad section of hose and or replace

Bruce
« Last Edit: February 08, 2017, 07:38 AM by brewster201 »
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Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #24 on: February 08, 2017, 07:57 AM »
Hello it appears to me that you have the fluid adjust open way too much and it is not atomizing properly. The excess is running down the tip. Try reducing to about 3 turns open and try again. What is the size of the nozzle/needle set?
Also replace the check valve on the hose, if it is plugged you will not pressure up the paint cup, cut out the bad section of hose and or replace

Bruce
Is a T-70 drastically different than a Gxpc where full open is 2 1/2 turns?  Close the flow all the way, pull gently on the trigger, mark the flow control knob, open the flow control allowing the trigger to move back the it hit the gun body and count the turns.  I've read read comments mentioning 5-6 turns on a T-70 so I'm not sure if that is possible.
Bill
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Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #25 on: February 08, 2017, 05:48 PM »
If the tube is cracked just cut off the area, no problem as long as it reaches it's fine.

You might try one wrap of some Teflon tape on the nozzle threads.

So far works great with that trick!Thanks

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #26 on: February 08, 2017, 05:50 PM »
Hello it appears to me that you have the fluid adjust open way too much and it is not atomizing properly. The excess is running down the tip. Try reducing to about 3 turns open and try again. What is the size of the nozzle/needle set?
Also replace the check valve on the hose, if it is plugged you will not pressure up the paint cup, cut out the bad section of hose and or replace

Bruce

Looks like the tread inside gun has problems.

Offline tjbnwi

  • Posts: 4754
  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #27 on: February 08, 2017, 06:10 PM »
Contact Fuji, they should be self sealing.

Tom

Offline Tim Raleigh

  • Posts: 3409
    • Oakville Cabinetry
Re: Paint leaks from fuji hvlp air diffuser
« Reply #28 on: February 09, 2017, 10:33 AM »
I got the rebuilt kit yesterday and after changing two plastic rings , it stopped leaking. But it started again today. Also the  cup bubbles too. Pls see pictures.

There is definitely something wrong there.
You should not be getting any amount of paint in that area.
You really need to find someone in your area that can take a look at that gun and either fix it or throw it away.
No wonder you are having problems getting a good coat.
Did you buy that gun second hand or new?
Tim

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #29 on: February 09, 2017, 07:37 PM »
I bought it new.

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #30 on: February 09, 2017, 09:06 PM »
I bought it new.
How much has it been used?
Bill
Most Confused!

Festool USA does not pre-approve the contents of this website nor endorse the application or use of any Festool product in any way other than in the manner described in the Festool Instruction Manual. To reduce the risk of serious injury and/or damage to your Festool product, always read, understand and follow all warnings and instructions in your Festool product's Instruction Manual. Although Festool strives for accuracy in the website material, the website may contain inaccuracies. Festool makes no representations about the accuracy, reliability, completeness or timeliness of the material on this website or about the results to be obtained from using the website. Festool and its affiliates cannot be responsible for improper postings or your reliance on the website's material. Your use of any material contained on this website is entirely at your own risk. The content contained on this site is provided for informational purposes only and does not constitute professional advice.


Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #31 on: February 09, 2017, 10:55 PM »
Just a couple of months did just half of kitchen cabinets so far.  [sad]

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #32 on: February 09, 2017, 11:19 PM »
Just a couple of months did just half of kitchen cabinets so far.  [sad]
Although I have many spare pressure tubes,  my first one has seen more action and is crystal clear unlike yours which looks like it's been through three wars!
Bill
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Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #33 on: February 10, 2017, 10:35 PM »
Just a couple of months did just half of kitchen cabinets so far.  [sad]
Although I have many spare pressure tubes,  my first one has seen more action and is crystal clear unlike yours which looks like it's been through three wars!

 [big grin] [big grin] [big grin]What's the purpose of this tube? I didn't use solvent to clean it because I'm afraid of breaking it. Once the gun is leaking, it is a mess everywhere and very hard to clean.

I am still getting air bubbles. If the weather is nice and material is thin enough, I was able to get smooth finish but still with bubbles no matter how far/near I put my gun to the surface or how thin or thick the coating is. What's the possible solution to get rid of it without respraying the whole board? Thanks a lot!

Offline tjbnwi

  • Posts: 4754
  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #34 on: February 10, 2017, 10:40 PM »
Just a couple of months did just half of kitchen cabinets so far.  [sad]
Although I have many spare pressure tubes,  my first one has seen more action and is crystal clear unlike yours which looks like it's been through three wars!

 [big grin] [big grin] [big grin]What's the purpose of this tube? I didn't use solvent to clean it because I'm afraid of breaking it. Once the gun is leaking, it is a mess everywhere and very hard to clean.

I am still getting air bubbles. If the weather is nice and material is thin enough, I was able to get smooth finish but still with bubbles no matter how far/near I put my gun to the surface or how thin or thick the coating is. What's the possible solution to get rid of it without respraying the whole board? Thanks a lot!

The gun is broken, you'll never get a good finish with defective equipment.

Call Fuji, tell them bout the problem. Hopefully they'll send you a replacement gun.

Tom

Offline Tim Raleigh

  • Posts: 3409
    • Oakville Cabinetry
Re: Paint leaks from fuji hvlp air diffuser
« Reply #35 on: February 14, 2017, 11:46 PM »
The gun is broken, you'll never get a good finish with defective equipment.

Call Fuji, tell them bout the problem. Hopefully they'll send you a replacement gun.

Tom

Agreed.
The gun is not operating correctly.
Call Fuji, they are really good to deal with. I believe @JCLP knows the name of the guy to speak to.
Tim

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #36 on: February 15, 2017, 11:38 PM »
I contacted fuji and they asked me to mail to a place they have contracted with and no one is there @1pm to receive the package. So I expressed my concern that I need this thing fixed as soon as possible. CS suggested me to buy  a m-series gun.  [sad]  At this point I am idling.

BTW, I found it is so hard with bottom feed to spray anything close to the ground. Any suggestions?
Another issue is how to spray up inside of the cabinet as the board is not movable and visible when look up.

Thanks a lot and best
« Last Edit: February 15, 2017, 11:41 PM by usatu »

Offline tjbnwi

  • Posts: 4754
  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #37 on: February 16, 2017, 12:19 AM »
Add the PPS system to the gun, you can spray with the gun upside down.

In time you'll learn to spray blind.

Tom

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #38 on: February 16, 2017, 09:10 AM »
Tom- will pps system compatible with a bottom feed gun?I only have a t70.

Thank you

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #39 on: February 16, 2017, 09:21 AM »
Tom- will pps system compatible with a bottom feed gun?I only have a t70.

Thank you
Yep, just need the proper adapter.
Bill
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Offline tjbnwi

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  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #40 on: February 16, 2017, 09:22 AM »
Tom- will pps system compatible with a bottom feed gun?I only have a t70.

Thank you

You need a #18 adapter. Make sure the cups you order are HO style. I believe the "most confused"[big grin] one has a post with all the variations in this section of the forum.

Tom

Offline JCLP

  • Posts: 644
Re: Paint leaks from fuji hvlp air diffuser
« Reply #41 on: February 16, 2017, 09:40 AM »
Here is a link to what you will need for the T70 bottom feed gun.

PPS for T70

I believe you can order from these guys. Or just call them and they will guide you. Fuji Spray also recommends dealing with them.
Cheers,
JC

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #42 on: February 16, 2017, 10:38 AM »
sorry,but it look s like it is still bottom feed when using adapter. I am trying to understand pps system's benefits.

Offline JCLP

  • Posts: 644
Re: Paint leaks from fuji hvlp air diffuser
« Reply #43 on: February 16, 2017, 11:01 AM »
sorry,but it look s like it is still bottom feed when using adapter. I am trying to understand pps system's benefits.

You can't convert your bottom feed to top feed ( gravity). You will have to purchase another gun. The T75 gun. The needles and cap set for the T70 is compatible with the T75. If you go with the M series or GXPC gun you would need to purchase additional needles and caps as they are not the same as the T series.

JC

Offline tjbnwi

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  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #44 on: February 16, 2017, 11:28 AM »
sorry,but it look s like it is still bottom feed when using adapter. I am trying to understand pps system's benefits.

Yes, it will still be a bottom feed, but you can flip the gun over, spraying with the cup and hose pointing up (the gun will now spray in any position, (this is true if you're connected to a separate pressure pot also). You cannot do this with a conventional cup on the gun.

Tom
« Last Edit: February 16, 2017, 11:35 AM by tjbnwi »

Offline wptski

  • Posts: 376
Re: Paint leaks from fuji hvlp air diffuser
« Reply #45 on: February 16, 2017, 11:31 AM »
sorry,but it look s like it is still bottom feed when using adapter. I am trying to understand pps system's benefits.
The PPS system uses a flexible material liner so when start off, you bleed the air in the liner above the material.  That being, it allows spraying at any angle as there is no air pocket to deal with.  If you ask me, if the cup is above or below the gun, either way it'll be issue in some situation.

If you want the best "all angle" setup, you'll have to go with a pressure pot system.

« Last Edit: February 17, 2017, 12:47 PM by wptski »
Bill
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Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #46 on: February 17, 2017, 11:43 PM »
Thank you all. So PPS can let you spray more difficult angles and provide easier cleaning. Does it provide better finish result? I am debating whether I should spend $200.

I found amazon has cheaper price and wonder whether I missed anything. Below is all I need for PPS system, right?

3M 16054 PPS Adapter 18 $28.05

3M 16124 PPS Type H/O Large Pressure Cup $66.75

3M 16024 PPS Large Kit with 200 Micron Filters $62.70

Thank you!

Offline tjbnwi

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  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #47 on: February 18, 2017, 12:31 AM »
Thank you all. So PPS can let you spray more difficult angles and provide easier cleaning. Does it provide better finish result? I am debating whether I should spend $200.

I found amazon has cheaper price and wonder whether I missed anything. Below is all I need for PPS system, right?

3M 16054 PPS Adapter 18 $28.05

3M 16124 PPS Type H/O Large Pressure Cup $66.75

3M 16024 PPS Large Kit with 200 Micron Filters $62.70

Thank you!

Finish quality is ultimately in the hands of the person holding the gun.

Did you contact Fuji about the T-70?

Tom

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #48 on: February 18, 2017, 10:01 PM »
I contacted fuji and sent my gun to their contractor to fix. Haven't heard back from them yet.

Offline usatu

  • Posts: 121
Re: Paint leaks from fuji hvlp air diffuser
« Reply #49 on: February 19, 2017, 09:19 PM »
I got the gun back today. They changed a nozzle and screwed the new nozzle super super tight. No leaks anymore yeah! But should I do the same? I just don't want to damage the gun.

Offline tjbnwi

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  • Cedar Tucky Indiana
Re: Paint leaks from fuji hvlp air diffuser
« Reply #50 on: February 19, 2017, 09:21 PM »
I got the gun back today. They changed a nozzle and screwed the new nozzle super super tight. No leaks anymore yeah! But should I do the same? I just don't want to damage the gun.

I barley snug mine. Seated plus 1/8 turn.

Tom