Crossman 760 pump master help

[jhorta1987]

Hi everyone. I am trying to put back together a old Crossman 760 pump Master pre-1975. I replaced all the O-rings but having a hard time reassembling everything. The schematics I have are very small and hard to read so I thought I would see if anyone with more experience with these could lend me a hand. I am going to post some pictures can anyone tell me if I have the parts correct? And would anyone be able to tell me what the small piece is. it came out of the tube but I can’t see it on the schematic. All the videos on YouTube on putting these together they look different from mine so I thought I would try here before throwing in the towel. thank you in advance. I was trying to surprise my father by getting to work. Now I would just like to get it back together LOL.



Is this correct order of parts?

what does this go to? It fell out of the tube with the brass.

 

[Chachoze]

Sounds like you should send a private message to Leonard, his handle here and other forums is Unionrdr and has a good amount of info on the 760's and he has a few treads going in the Springer Tuning and Repair section here about 760 rebuilds.

Perhaps he will see this thread and respond.

Here is a list of his theads here. https://www.airgunnation.com/members/unionrdr/forums/

His Youtube videos can be found here:https://www.youtube.com/user/unionrdr/videos

 

[MMCM13]

The brass piece is reversed.

 

[jhorta1987]

Thanks guys. I’ll check him out and turn the brass piece around. 

 

[Odoyle]

 



https://youtu.be/Ex0h5wIl2oM



OOPS looks like YOURS is different! 

https://youtu.be/dhY857ehUoY

 

[MMCM13]

That little piece is 1930-016 the sleeve that the gasket for transfer of air to barrel slips over.

 

[patbob]

There should also be a square O-ring that slips onto the transfer port sleeve that I'm not seeing. Without it, a lot of the air will be lost. As I recall, the flat part of the sleeve gets installed facing the valve.

 

[unionrdr]

I've never seen the breech port gasket use that small sleeve? Never needed one with a good gasket/seal. I can see where it would be advantageous to holding the seal's shape with use. And the gas valve is backward. I have a lot of videos on Youtube about restoring different variants of the 760 Powermaster's & Pumpmaster's. They will answer many of your questions. Look at my channel and click on videos. You'll get the whole list to go through.