HW45 Poor performance. Is there a service guide?

[Jweaver]

Since I am sending my Combro chrono off for a service today, I decided to test my HW45, after all, if I 'missed' and broke the chrono, it wouldn't be an issue as they replace all of the broken bits for a flat fee (£7.50).

I was disappointed that it only shot 467fps (verified over 3 shots), with an 8 grain pellet, which by my calculation is 3.8ft/lbs.

I have a Polish Chrono on order, so will be able to verify the result, but I am pretty sure its right.

What can I do to restore the power? Is there a guide showing how to strip/service the gun?

Jon

[joffy]

http://www.airgunbbs.com/showthread....-with-pictures

[Jweaver]

http://www.airgunbbs.com/showthread....-with-pictures

Perfect.. I did a lot of searching and couldn't find anything.. Missed the vital words "strip down".. Cheers.

Before I go too far, is there any "maintenance" I could/should do (i.e a spot of oil)?

[ejackyou]

What calibre is yours, if its a .22cal that's very good performance for a 45
Some recommend dry firing the gun twice Only, when new, to set the Teflon seals
I shot mine into some padding to dampen it a little.

[Josie & John]

Mainspring main be broken, especially if the cocking stroke sounds graunchy or less robust than it used to be.

Or it may be something simple such a worn or damaged breech washer. Worth checking both before you get the tool kit out.

Finally a really daft question: Some pistols have 2 power settings. Are you positive you are fully cocking the pistol?

John

[Jweaver]

Mainspring main be broken, especially if the cocking stroke sounds graunchy or less robust than it used to be.

Or it may be something simple such a worn or damaged breech washer. Worth checking both before you get the tool kit out.

Finally a really daft question: Some pistols have 2 power settings. Are you positive you are fully cocking the pistol?

John

Defo on full power.. Cocking feels normal.. But in truth, I bought this 2nd hand from a guy at my club, so I didn't know any different.. I don't know how much use its had.. But personally, I have only shot 100s pellets or so...

I will do some inspection before I get the tools out (And will wait till I get my new Chrono just to be sure).

Jon

[Jweaver]

What calibre is yours, if its a .22cal that's very good performance for a 45
Some recommend dry firing the gun twice Only, when new, to set the Teflon seals
I shot mine into some padding to dampen it a little.

Its a .177, so a bit low... Funnily enough, it was dry fired last week by my friends by accident.. But I hadn't Chrono'd it before, so I don't know if this did any good, or harm.