HW70 help

HW70 help

Joined: April 19th, 2001, 6:33 pm

February 7th, 2018, 10:14 pm #1

Picked up an HW 70 pistol and its shooting @310fps with 7.4 grain pellets. Looks like this thing needs new seals and maybe a mainspring. Any tips on disassembling this pistol, I can't find any instructions online anywhere. It looks like I will need to make some sort of tool to unscrew the breech plug at a minimum.
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Joined: March 18th, 2011, 6:24 am

February 8th, 2018, 12:54 am #2

if you get a leak replace the breech seal and rechrono

here is a great write up and give you numbers to shoot for

https://www.pyramydair.com/blog/2013/04 ... ol-part-4/

here are the part numbers

https://www.dropbox.com/s/10bn62dpd8592 ... h_HW70.pdf

the breech seal is the same used in most of the rifles if compare the part numbers at T.W. Chambers

the end cap has a grub screw on the bottom

short pistol springs don't take a much of a beating so that is more then likely ok

rebuild info hard to find like you say, I keep looking
Last edited by marflow on February 8th, 2018, 12:56 am, edited 1 time in total.
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Joined: April 19th, 2001, 6:33 pm

February 8th, 2018, 3:22 am #3

Thanks for the reply, I did notice the breech seal looks like it' has some flaking, just ordered some new seals so going to try that first.
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Joined: March 18th, 2011, 6:24 am

February 8th, 2018, 5:46 am #4

flip the seal around and get a fresh side, just for a test
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Joined: December 26th, 2003, 1:33 am

February 12th, 2018, 3:17 pm #5

Correct..though it may need shimmed with a wee bit of dental floss. They take the same seal as an HW rifle.
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