Gamo Reassembly
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Gamo Reassembly
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Topic: Gamo Reassembly (Read 1652 times))
Ribcracker
Shooter
Posts: 7
yes
Real Name: Bud
Gamo Reassembly
«
on:
May 23, 2018, 10:40:16 PM »
I've been shooting airguns all my life but just now tried doing my first rebuild on my old Shadow 1000. I bought a "kit" from airrifleheadquarters which luckily came with two seals since I buggered the fist one trying to install it.
Well, getting the gun apart was easy enough but now I can't get it back together. Doh! Obviously I didn't pay close enough attention to the order of parts removal.
Pray tell, what is the proper order of re-assembly for these components: cocking link, piston, trigger group, and mainspring?
Thanks for any and all advice.
Peace,
Bud
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USA, Michigan, Oxford
sawtoothscream
GTA Senior Contributor
Posts: 2395
Re: Gamo Reassembly
«
Reply #1 on:
May 23, 2018, 11:24:07 PM »
Piston, spring with the top hat going into the piston then you can install the endcap back on and put the pins back in it. Can put the cocking arm back on at this point and put the trigger back together.
Put gamo tuning into YouTube, there is a video of a guy tearing his apart and putting it back together. Really easy.
Also, make a spring sleeve. Can YouTube that as well and use plastic bottle.
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New York
hw97k .177 w/ vortek pg2 sho hawke airmax 3-12x40
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Sharp Shooter
Posts: 625
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Real Name: Dee
Re: Gamo Reassembly
«
Reply #2 on:
May 23, 2018, 11:40:46 PM »
Or check on the GTA library , you can find lots of information there too. Have fun and stay safe !
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A 51
BSA meteor mk4 .22
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Honorary GTA Moderator
GTA Senior Contributor
Posts: 9703
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Real Name: Thomas
Re: Gamo Reassembly
«
Reply #3 on:
May 24, 2018, 01:28:12 AM »
Well, you figured out how to get it apart - that's almost half the battle. I hope you've gone through the cleaning and debur process prior to beginning reassembly. You may even wish to lubricate as you go. I'm not going into any of that, just actual assembly.
Put the piston and new seal (with just a bit of lube on the seal lip) into the compression tube. Check for difficulty of pushing it into the tube. It should take two to three pounds of pressure. If it takes much more you'll need to size the seal for best results. If it takes less you need a larger seal. If you have a tophat put it into the spring then insert tophat and spring into the piston. Be sure the slot on the piston aligns with the cocking slot. Insert the spring guide into the end of the spring and push things together. Insert the trigger package into place and put things back into the spring compressor. You may have to fiddle with the trigger package a bit, slipping it into place as you begin to apply pressure with the spring compressor. Note the sear on the trigger package is spring loaded. Be sure it goes outside the cross piece on the compression tube. The cross piece prevents the whole thing from going into the compression tube and jamming. If you put the sear under the cross piece you cannot get things to go together. Once you have the end cap secured in place you should be able to put the cocking arm into the piston and complete reassembly.
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Near the Southern Coast of Washington State
Real knowledge is knowing the extent of one's ignorance.
mata777
Plinker
Posts: 120
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Real Name: Joe
Re: Gamo Reassembly
«
Reply #4 on:
May 24, 2018, 02:49:03 AM »
Getting the trigger assembly into the slot and resting the sear on the outside edge of the slot can be tricky. The following is a crosman rebuild video but it's basically the same thing as a gamo (internally). I used a arh telsa seal in my shadow, had resize the seal several times as it was way too tight. Ended up with a 9 fpe gun using a merlin xl spring (very soft spring) fitted to the stock spring guide by sanding it down, cocks with very little effort and the firing cycle feels like a gas ramed rifle without the recoil. I don't think I resized the seal down enough which explains the lower power, but I'm leaving it as is. As previously mentioned, deburr the slot and holes if you don't want to damage the other seal. Also, the spring (if ordered un set) can be bit harder to install without a spring compressor.
«
Last Edit: May 24, 2018, 02:56:51 AM by mata777
»
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USA IL will county
Air Arms Pro Sport .177 - Vortek 12 FPE Kit
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sawtoothscream
GTA Senior Contributor
Posts: 2395
Re: Gamo Reassembly
«
Reply #5 on:
May 24, 2018, 04:12:42 AM »
Here's a good video
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New York
hw97k .177 w/ vortek pg2 sho hawke airmax 3-12x40
Mrod .25, utg swat4-16x44 war tss and mds
Pp700 .22. Nstar 2.5x30
Disco .22 leaper 3-9x50
2240 carbine
2260
B26-2 MM tuned leapers 3-9x40
Hatsan 125 sniper
Ribcracker
Shooter
Posts: 7
yes
Real Name: Bud
Re: Gamo Reassembly
«
Reply #6 on:
May 24, 2018, 11:06:18 PM »
Guys,
Thanks for the quick replies and good advice. I had another go at it tonight and think I may have ruined the gun. But maybe not.
When compressing the spring with my jerry-rigged car jack device, the spring guide stopped moving about half inch short of home so I added more pressure until the gun started digging into the 2X4 and now it looks like I have some serious barrel droop. I believe I bent it.
So I started over and this time I was able to seat the spring fully and insert the stop pin.
But...the gun won't cock. Apparently the cocking link isn't engaging the piston properly. Where is it supposed to engage?
I'll give it another go tomorrow night but right now I just feel like throwing it into the pond.
Thanks for your patience. I could use some of that right now.
Peace,
Bud
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USA, Michigan, Oxford
sawtoothscream
GTA Senior Contributor
Posts: 2395
Re: Gamo Reassembly
«
Reply #7 on:
May 24, 2018, 11:42:03 PM »
There's a slot running down the piston, it just goes into that slot. Looks like you just have to push the lever back down against the compression tune at this point.
Video above , watch it and it will answer all your questions
Logged
New York
hw97k .177 w/ vortek pg2 sho hawke airmax 3-12x40
Mrod .25, utg swat4-16x44 war tss and mds
Pp700 .22. Nstar 2.5x30
Disco .22 leaper 3-9x50
2240 carbine
2260
B26-2 MM tuned leapers 3-9x40
Hatsan 125 sniper
mata777
Plinker
Posts: 120
yes
Real Name: Joe
Re: Gamo Reassembly
«
Reply #8 on:
May 25, 2018, 02:51:42 PM »
Are you trying to get the cocking linkage to engage the piston without putting the action into the stock? My shadow wouldn't engage the piston either, unless it was in the stock.
Logged
USA IL will county
Air Arms Pro Sport .177 - Vortek 12 FPE Kit
HW-30s .20 - Vortek Kit
HW-50s .22 - JM Kit Self Tuned Custom Walnut Stock
Diana 34 .177 - Turbo Tuned By Gene C. JM Parts
HW 97K-T .20 - Rob Hawkins Tuned
UK Webley Stingray .177 - JM Kit
Diana 240 T05 .177 - Self Tuned JM Parts
HW-95 .22 - Stock (For Now)
Ruger Black Hawk .177 - Stock (Project Gun)
Crosman Titan .22 - Stock Gas Ram CDT Trigger
Benjamin 392 .22 - Stock
Gamo Shadow 1000 .177 - JM Internals
Xisico XS-28 .25 - Vortek Kit
Roadworthy
Honorary GTA Moderator
GTA Senior Contributor
Posts: 9703
yes
Real Name: Thomas
Re: Gamo Reassembly
«
Reply #9 on:
May 25, 2018, 03:04:08 PM »
You cannot cock the gun if the stock is not installed. The "knee" of the articulated cocking linkage must press against the stock to force the piston to cock.
Logged
Near the Southern Coast of Washington State
Real knowledge is knowing the extent of one's ignorance.
Ribcracker
Shooter
Posts: 7
yes
Real Name: Bud
Re: Gamo Reassembly
«
Reply #10 on:
May 25, 2018, 03:43:46 PM »
Boom, I got it! Thanks to you guys! The explanations and videos were invaluable. And this makes me realize I might not be as mechanically inclined as I thought. But I imagine the next time will be much easier.
Turns out, as you've noted, the reason the gun wouldn't cock is because the action needs to be mounted in the stock in order for the link to do its job. And the barrel is NOT bent! Ya see, I also replaced the breech seal and it sits about a sixteenth too proud. That's why the barrel appears to be drooping. Tonight I'll dig out the seal and try to remove about a sixteenth of stock from its base. Sandpaper?
I can already tell the gun has much more power than it did. The reason I did this rebuild was because it took so little effort to cock. I figured the spring must have taken a set and Boy, was I right! The new spring was about six inches longer than the old one with the same number of coils (33). And now the cocking effort is commensurate with the new-found power.
The second seal fit much better than the first and I was able to get it in without damaging it. Phew! By the way, the original seal was quite beat up. So this should improve the shot-to-shot fps deviation and I look forward to doing the break-in. I learned from my new Nitro Venom that break-in is imperative. The Venom's accuracy was dismal at first but after a few hundred rounds it cleaned its act right up. It can now reliably hit a ten inch plate on the other side of the pond from my bench (picnic table) which is 120 yards according to my Bushnell range finder. Of course, I have to aim about three feet high. Hopefully, the Shadow 1K will acquit itself as nicely. We'll just have to see.
Anyway, thanks again! Couldn't have done it without you.
Peace,
Bud
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USA, Michigan, Oxford
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Gamo Reassembly