Fwb600 problem

[NeilnrLincoln]

I'll give that a try in the short term until I can get some seals.
Thanks for that Russ.

[Jimlad]

City Air Weapons carry FWB spares

[NeilnrLincoln]

Well, I finally received a set of seals for the FWB600, minus the piston seal as this is out of stock & following on later. I thought as the piston seal that's fitted appears to be a modern replacement I'd go ahead & replace the rest of the seals.
I stripped her down, cleaned everything up & fitted all new seals (obviously refitting the original piston seal, which looked fine), relubed sparingly with the correct Feinwerkbau grease & reassembled. The only slight issue I could find was a little rust on the valve but this was at the spring side not seal side & I cleaned it up. Tried it once reassembled and....

pfft, it still only compresses a charge when it feels like it & almost never on the first stroke of the lever. Looks like the piston seal is goosed after all, so it's back in the cabinet awaiting the eventual delivery of the final seal, hopefully that'll fix it.

[abellringer]

This is symptomatic with impending valve seal failure; if the piston head is worn /damaged then air will just bleed out behind the piston. When the valve seal is starting to split up, you get all sorts of erratic behaviour, very common ids the effect of the cocking lever kicking back on opening as all the previous air is not expelled. I would look at the valve area first again, check the little brass cone is clean and not scratched, the spring is not failed, and don't put any grease in there on assembly. Once the valve is sorted you can compress, shoot / check power; then re cock and leave for an hour, repeat, then repeat over 24 hrs; this should confirm piston head condition. Any more info needed, PM me by all means.

[10/10]

It is nearly always the valve seal which decays, and you can get at this from the back.
I am pretty sure it is the same seal as the FWB 100- 102 103 it will some times let by untill the valve seats

[NeilnrLincoln]

Sorted now, thankyou. All seals replaced & it turned out to be the cocking link, the 90 degree bend at the end of the link had got very slightly bent so it just wasn't quite travelling far enough to set the trigger every time.

[PhatMan]

Neil,

The link is adjustable for 'length' on the '602 - is it also so on the 600 ?

Have fun & a good weekend

Best regards

Russ