Author Topic: 760-D Pumpmaster (Read 10527 times))

unionrdr · « **Reply #20 on:** January 14, 2018, 10:46:29 AM »

Okay, well, since my brother PM'd me on Facebook about how the gun was coming, I pushed it to the head of the restoration line. Had to go to Harbor Freight Tools and get a set of long pin punches. It seems the pivot pin on the front of the pump tube/forestock is a tubular pin inside of a tube? That seems to be why you need a pin punch to remove it? I also noticed, upon scanning the parts diagram, that the elevation adjuster for the rear sight is missing? Interesting too that the little pump piston connecting rod assembly is blued as well?! So here then, is part one of my 760-D Pumpmaster resto on Airgun Shooter!

unionrdr · « **Reply #21 on:** January 16, 2018, 01:51:36 PM »

Well, being a really slow day today (I guess everyone had to go back to work & school?), even the 5-6 Facebook groups I'm admin or moderator of came to a hault for a couple hours. So, getting bored, I decided to work on the rifle a bit more. Got a few small parts soaking in B/C blue/rust remover. Let the green fairy do her thing in an old Tooters glass I saved from earlier times. Looks like it'll take at least a couple hours, though? Rust is embedded pretty serious.

I thought I'd at least get something done while I wait for the brass brushes,blue paper towels and long pin punches to get here.

unionrdr · « **Reply #22 on:** January 21, 2018, 02:15:17 PM »

Here's part 2 of my 760-D Pumpmaster resto for your consideration.

unionrdr · « **Reply #23 on:** January 29, 2018, 04:59:21 PM »

I started working on the next episode of this restoration today. Should be up by the end of the week?

unionrdr · « **Reply #24 on:** January 31, 2018, 08:35:15 AM »

Okay. Got part 3 done earlier than expected, so here it is...

unionrdr · « **Reply #25 on:** February 06, 2018, 10:24:03 AM »

These must've been delivered very late yesterday, since my son found'em on the porch when he came home from work early this morning? Set of roll pin punches for knocking out the roll pins used as pump pivot points on my 760's;

Found'em at homer cheapo for $13.09. Now I can start finishing it up finally.

unionrdr · « **Reply #26 on:** February 12, 2018, 06:49:10 PM »

Got some work done on the 760-D, trying to wind it up. Here's part 4 of the restoration videos;

unionrdr · « **Reply #27 on:** February 14, 2018, 10:45:22 AM »

The pump tube bluing job is curing very nicely indeed! All that polishing paid off!...

happymecanic · « **Reply #28 on:** February 14, 2018, 07:14:50 PM »

Very nice job Leonard, you really brought it back to life! There was quite a bit of pitting, but it doesn't show at all. If I can offer an advice, keep it well oiled, cold bluing is not as rust resistant as hot bluing, that would be sad to see surface rust after all that work! And cool vid BTW!

bantam5s · « **Reply #29 on:** February 15, 2018, 01:25:09 AM »

Quote from: unionrdr on February 12, 2018, 06:49:10 PM

Got some work done on the 760-D, trying to wind it up. Here's part 4 of the restoration videos;

Great job on the bluing, way better than this plastic gun deserves.

Now I don't want to sound rude or anything, but this was my favorite video so far, watching you try to remove those " screws " was so hilarious.
Just so you know those aren't screws, they're moulded into the sonic welded on butt plate.

unionrdr · « **Reply #30 on:** February 15, 2018, 03:34:16 PM »

Thanks Happymechanic! And yes, I keep them oiled and cleaned. I think we're a lil more like ZZTop...Manic Mechanic! Have mercy, miss Percy...I done put da coon tune on this B****! THAT's RIGHT!

It was kinda funny later as I was editing and saw that moment of realization. Seems to me we had this conversation elsewhere today??? And wait till mac1 gets the manual cocking seal upgrade kits completed! I'm getting one when he does for this one. So I'm moving on to repairs and a couple other rifles I need to get to work on again I did videos for.

unionrdr · « **Reply #31 on:** April 06, 2018, 10:41:10 AM »

Okay, well, mac1 said he was refunding everyone's money who pre-paid for the 760-D manual cocking rebuild kits. He's still having trouble wit the 90 durometer seal supplier. So I searched Amazon again, finding a seal/rebuild kit for $13.99. Got here yesterday. They also gave me a printout of the 760-B, etc exploded diagram .PDF I already found. Doesn't say "D" on it, but virtually the same.

So the rebuild video will be coming soon. Trying to finish the rebuild/video for the 760v1 at the moment.

unionrdr · « **Reply #32 on:** April 15, 2018, 06:23:46 PM »

I started working on the 760-D Pumpmaster restoration final episode today. Want to get it done for next weekend. This is gonna be good!...

unionrdr · « **Reply #33 on:** May 03, 2018, 11:52:47 AM »

And here is the 760-D restoration, part 5. Even on a bright day outside, it's hard to get dark objects to show up lighter, as they actually are. Or bright ones on dark surfaces. Digital has it's limitations. Anyway, here's the video;

And some better pics of the stocks under the desk lamp. Real dark with thunder boomers outside! I didn't think until early this morning that I should've sanded them with 800 grit after the gloss black acrylic had dried to lighten the tone of the high spots. Then apply the Tru-Oil top coat. The stocks would've been a hair lighter over-all. Note to self...

unionrdr · « **Reply #34 on:** May 07, 2018, 07:35:54 PM »

Well, all is not well. Hit an unexpected snag. The white plastic check valve in the rebuild kit is too short, so I put the longer stock one back in and reassembled the rifle the 2nd or 3rd time. Still pumping all the air out the barrel. Thinking the new white plastic exhaust valve stem not closing or? Thinking of putting the old one back in? Polished it up and all. Got the trigger assembly right and lubed. Not sure what to tweak this time?

unionrdr · « **Reply #35 on:** May 08, 2018, 08:24:40 PM »

Okay, I figured out and fixed all the bugs. Including those the Crosman diagrams don't show or explain. I've taken care of all that, especially with regard to the, " rebuild kits". Here then, is the final episode of the 760-D Pumpmaster restoration.

unionrdr · « **Reply #36 on:** May 09, 2018, 08:57:21 PM »

And some pics from today with me and the 760-D after cleaning & lubing it;

unionrdr · « **Reply #37 on:** May 15, 2018, 04:12:27 PM »

well, dang. My chrono quit on me when I went to test this 760-D. Loss of com between the 'droid phone and the Caldwell unit. So I called Battenfield Technologies, Inc today. They make Caldwell products. I explained my problem, he suggested what to try, no go again. So, they're sending me (free!) the USB wire that plugs between the phone and the fire wire port to the left of the headphone jack port the wire provided uses. and... the white LED lights they changed to after mine with the IR lights was built (9/29/16). Their phone # is; (573) 445-9200. Also, they posted on Amazon's page for the unit that those built 2015-2016 that caused a lot of ERROR2 & ERROR3's had to be sent back and replaced. They want to try the test wire they use and the white LED's and see if that works. All free! So I told him I'd test them singly and together to see what happens. Nice of them to at least try to help nearly 2 years after the fact!?

unionrdr · « **Reply #38 on:** July 08, 2018, 09:57:28 PM »

The final chapter in this all-gone-haywire adventure is ready for you on Airgun Fan!

unionrdr · « **Reply #39 on:** July 28, 2018, 02:09:28 PM »

Well, two days ago I was looking at the 760-D yet again, and just couldn't stand how the stock, " overwash" was looking too dark and rather blotchy for my liking. (refer to earlier posts here to see the before pics) So, I got out a piece of 800-grit emery paper and carefully sanded down the butt stock. Just enough to sand off the high spots that the black overwash had darkened too much to merely wipe off with a damp cloth. This exposed the medium-brown plastic once more, making the black filled grain stand out more clearly. And lightening the tone overall. I then re-clear coated it with Tru-Oil and hung it up to dry thoroughly. Now it looks more like what I was trying to replace with my " overwash" method. This is the darkened grain detail Crosman started leaving out of the production process at some point. Darn shame, as you can see at last. Lots of molded-in grain detail there!

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760-D Pumpmaster

Author Topic: 760-D Pumpmaster (Read 10527 times))