Identify my powermaster 760

[jmrwbilly]

 Looking for some info. I picked up this old Crosman powermaster 760 from a flee market for $7. Won't pressure at all, took it apart, appears the piston cup was torn. I'm wondering if anyone can identify the variant of the rifle. Serial number 05825197

 

[Brian10956]

According to your serial # it was made in May 1982

 

[jmrwbilly]

That' why I'm here.. according to https://www.crosman.com/discover/crosman/crosman-product-dates, the 1982 model had plastic bolt.. mine is brass

Also, in looking a replacement parts, this appears to have “old style ” valve, and piston cup 

this model also predates the mechanism with trigger to prevent firing with bolt open..

 

[jmrwbilly]

I

 

[Brian10956]

It’s possible a previous owner put in parts from another gun that was used for spare parts 

 

[jmrwbilly]

Turns out it is a third variant. Judging by the breakdowns found here: https://drive.google.com/file/d/0B2hkfoL4OoEfSC1VMVFWeUpTa1U/view

Matches the pre 1975 models
Taking closer look at the gun compared to the crosman site, forend is definitely wood. 

 

[Guest]

Yeah, variant 3, since it has the same valve as my variant 1 built 6/70;

 

[Mtruitt1971]

I am in the process of rebuilding a 760

Not sure of age but it has plastic stock, plastic forearm, plastic bolt with brass lever 

The valve assembly is brass and pointed.

It built up no pressure, everything was nasty gritty . I'm thinking a new piston cup, replacement valve, lost of grease and sanding, painting and smoothing. 

 

[Guest]

Got a pic of it? Sounds like a Pumpmaster?

 

[HueyIP]

I got a 760 out of Dad’s shop. I’ve looked all over it but can’t find any serial number for identification. I haven’t opened it up yet but it looks like plastic receiver, plastic bolt, rear site looks to be attached by two spot welds, plastic stock and fore end. There’s no front sight on it. It won’t pump up and needs bolt replacement. Is there any way to narrow down the date of manufacture so I can get replacement parts?

 

[Guest]

Look closely at the receiver. The plastic receiver Pumpmaster's definitely have the serial number either on the side or bottom of the receiver housing.

 

[HueyIP]

Thanks! I’ll look again when I get home Thursday. If I still can’t find it I’ll try and post a couple pics. 

 

[HueyIP]

Apparently I was looking in the wrong place. Just looked on the right side of pump tube and finally found serial number. Per the Crosman site was made August of 84 making it 7th gen. Now I can get some parts to get it running again. 

 

[Scrufhunter]

I think this maybe the gun in this video, or this guy maybe the one responsible for it.

https://m.youtube.com/watch?v=d9Jn218kFTA

 

[BIZNAWICH]

jrmwbilly:

Hi, I just joined mostly because I saw your 760 while checking through search engines. I have not seen any others exactly like mine so I wondered if we could talk about my 2nd rebuild that I'm about to start in 20 plus years. I have a kit coming from ebay..

Thanks, Bruce J (Biznawich)

 

[BIZNAWICH]

jmrwbilly:my serial # is 05841507



Biznawich

 

[BIZNAWICH]

jrmwbilly:

My question would likely concern mods to increase power if not accuracy.

Thanks once again,

Biznawich

 

[Guest]

Looking at that serial number, starting with zero like a couple of my specials, I'm not sure of it's 5/78 or 5/84? A variant 3 would be 70's and still metal receiver. Here's a pic of my 760 variant 4, dated 1/77 with metal receiver and brass bolt;

 

 

[BIZNAWICH]

Hello unionrdr, thanks for the reply.

My unit is a variant 3 verified. Plastic stock (good quality plastic I'm guessing...if such a thing exists lol, probably Lexan , it was used a lot back then) and wooden pump arm. I've found a nicked cup on the piston and the felt is likely in need of replacing as well.

I did the 4 o-ring replacement/maintenance as I had done some 20 years back but no pressure build-up this time around. I've never taken the breech end apart since I've owned it though it looks as if it had been dismantled at one time judging from the scratches...I'm the 2nd owner. I don't think anything at that end could be the trouble anyway.

Do you know of anyone anywhere from whom I can purchase such a beast as the piston assembly #130-59 for this 760? I have had only great service from this gun and now it's my grandsons turn if I can get it running.

Any help would be greatly appreciated sir.



Thank you,

Bruce W Jennings (BIZNAWICH)

 

[Guest]

Well, first off, you have to reseal and rebuild the valve and all that too. You can't fix these 760's half way. [email protected] has NOS parts. You can also check out my videos on the 760 variant one restomod on Youtube. Look for unionrdr's channel.