FWB 602 Problem

[Mtl_Biker]

About two months ago I bought a used FWB 602 from a reputable and experienced dealer who assured me the gun and seals were in perfect condition.  Exceptional condition.

I've shot about 3,000 pellets through it so far without issue. Last night during some shooting it sounded like a couple of shots were under-powered (and indeed the pellet hit quite a bit lower than the aim point) but that was only about two shots out of 60 and the problem didn't seem to be serious. Well, tonight a friend of mine and I were going to have a friendly match and we weren't even able to get one shot out successfully. The gun goes pffft, and the pellet falls far shot of the target. Shooting without a pellet the sound is just about normal... perhaps a little less strong. Put a pellet in and shoot, and it just goes pffft and the pellet falls to the floor. Nothing sounds or feels unusual during the cocking/loading process. I have no idea what to check or really even how this gun works internally. And I don't have a manual with the gun.

Please, can any of you give me some advice about what and how to check for the problem?

Thanks very much.

Eldor

[Roadworthy]

Do NOT shoot the gun with no pellet.  THAT can damage the gun.

Lay a tissue over the breech.  If it blows off you have a leaky breech seal.

Try shooting pellets over a chronograph.  It may give you an idea of how well the gun is working.

Beyond that it may be the spring or piston seal.  That will require dismantling the gun.

[T-Higgs]

The 602 is a single stroke pneumatic (SSP) and is perfectly fine to dry fire. I would first do as roadworthy suggested and do the tissue test on the breach seal. This will be the easiest fix. The rest of the mechanics are much more involved and better left to someone with experience in SSP repairs.

The 602 is a bute and well worth fixing!

Good luck,
Higgs

[K_sqrd]

You might get some ideas by searching this site.

http://www.targettalk.org/

Also, these folks can give you quite a bit of help in sorting out your problem. 

http://Pilkguns.com

The 602 is a fine AG and well worth fixing.

[grauhanen]

It does sound like a breech seal problem.  For a parts diagram, see https://www.feinwerkbau.de/en/Service+Download/Exploded-drawings

[Mtl_Biker]

Do NOT shoot the gun with no pellet.  THAT can damage the gun.

Lay a tissue over the breech.  If it blows off you have a leaky breech seal.

Try shooting pellets over a chronograph.  It may give you an idea of how well the gun is working.

Beyond that it may be the spring or piston seal.  That will require dismantling the gun.

Thanks for your reply, but my understanding is that shooting without a pellet on this gun will NOT cause any damage.

I did try the tissue thing, and the tissue didn't move at all when I fired a shot.  So based on that, it's not the breech seal.  Any idea what other seal it might be?

And there's no point chrony'ing the gun... the pellet falls on the floor short of the 10 meter target. 

[Mtl_Biker]

The 602 is a single stroke pneumatic (SSP) and is perfectly fine to dry fire. I would first do as roadworthy suggested and do the tissue test on the breach seal. This will be the easiest fix. The rest of the mechanics are much more involved and better left to someone with experience in SSP repairs.

The 602 is a bute and well worth fixing!

Good luck,
Higgs

Thanks.  I did the tissue thing and the tissue didn't move at all when I fired the gun.  So based on that it's not the breech seal.  Any idea what other seal it might be?

[Mtl_Biker]

You might get some ideas by searching this site.

http://www.targettalk.org/

Also, these folks can give you quite a bit of help in sorting out your problem. 

http://Pilkguns.com

The 602 is a fine AG and well worth fixing.

Thanks.  So far no luck with Target Talk but there are reports that Pilkguns is so busy that they're quoting several months for similar repairs.  Plus I'm in Canada, so sending the gun across the border (and getting it back) is quite a hassle.  I've also heard that they're quoting really high prices for such work, approaching more than half what the gun cost.

I'd really like to figure out what the problem is, and hopefully then be able to fix it myself.

[Mtl_Biker]

It does sound like a breech seal problem.  For a parts diagram, see https://www.feinwerkbau.de/en/Service+Download/Exploded-drawings

Thank you.  I did the tissue over the breech thing and when I fired, the tissue didn't move at all.  So I guess that means it is not the breech seal which is the problem.  Any idea of what else it might be?

[grauhanen]

I've sent you a PM with information on who to contact in Canada about your FWB.

[Mtl_Biker]

I've sent you a PM with information on who to contact in Canada about your FWB.

Got it.  Thanks very much.

[Mtl_Biker]

Just a little update...

I contacted the fellow recommended to me in a PM by Grauhanen, and as competent as the fellow sounds, he says the turn around time is about two weeks.  And I don't want to wait that long!!!  (I'm trying to practice for a club competition.)  Plus because of our possible Canadian postal strike any day, I don't want to risk having the rifle caught in limbo somewhere when the mail service stops.

So I've sent the rifle to Target Canada (Cibles) who I have dealt with many times and have been extremely well looked after by them.  They have it in their hands now, and reportedly have already started working on it.  They're also an authorized Feinwerkbau service center.

When I hear back about what's wrong, I'll report it here.

[Yogi]

Just a little update...

I contacted the fellow recommended to me in a PM by Grauhanen, and as competent as the fellow sounds, he says the turn around time is about two weeks.  And I don't want to wait that long!!!  (I'm trying to practice for a club competition.)  Plus because of our possible Canadian postal strike any day, I don't want to risk having the rifle caught in limbo somewhere when the mail service stops.

So I've sent the rifle to Target Canada (Cibles) who I have dealt with many times and have been extremely well looked after by them.  They have it in their hands now, and reportedly have already started working on it.  They're also an authorized Feinwerkbau service center.

When I hear back about what's wrong, I'll report it here.

If they are that good why did you hesitate to send it to them in the first place?

-Y

[Motorhead]

My WAG would be something hammer / striker related that while a single pump has charged it, striker is sticky and not making solid air release poppet valve contact.

Please post up when you find out was issue is 

[Mtl_Biker]

Just a little update...

I contacted the fellow recommended to me in a PM by Grauhanen, and as competent as the fellow sounds, he says the turn around time is about two weeks.  And I don't want to wait that long!!!  (I'm trying to practice for a club competition.)  Plus because of our possible Canadian postal strike any day, I don't want to risk having the rifle caught in limbo somewhere when the mail service stops.

So I've sent the rifle to Target Canada (Cibles) who I have dealt with many times and have been extremely well looked after by them.  They have it in their hands now, and reportedly have already started working on it.  They're also an authorized Feinwerkbau service center.

When I hear back about what's wrong, I'll report it here.

If they are that good why did you hesitate to send it to them in the first place?

-Y

There you go, trolling again.  SIGH

I never hesitated about sending the rifle to Targets Canada... at least once I decided that taking it apart and diagnosing/fixing it was beyond my novice abilities.  And certainly once I found they could do it, I didn't hesitate at all.  They've been absolutely superb to deal with in the 20 or so times that I've done so, including when products weren't right or failed.  They are top-notch IMHO.

But I don't think you really wanted a reply.

[Mtl_Biker]

Fixed!!!!!!  And already on the way back to me.

Total cost, including overnight return shipping was $72 (Canadian).  Fantastic service, with a faster than 24 hour turnaround.

One green seal and one main valve seal replaced.  Shooting 580 fps consistently.

Kudos to Targets Canada (Cibles) for the amazing service.  Every single one of my dealings with them has been terrific.

[Yogi]

 

[grauhanen]

It's good to hear it is fixed!