Thanks for using this forum If you think the built in forum search function sucks, Use Googles site search below
|
|
Google +1 button removed to improve site load speed:') |
Hard cocking and POI shift FIX!!!
Forum rules
MarauderAirRifle.com is not owned, Affiliated, or controlled by Crosman.
The Scope and goal of this section of the form is provide useful information 24/7 because I realize that most of us play with the toys on weekends when big companies and telephone support is not always available.
Normally if problems occur during this window you are SOL until the next business day (and your fun is over)
So if you are having problems check or search here to see if it is a known issue and what steps can be taken to resolve the issue.
If you ask questions on this forum, I can not guarantee Crosman support will see the post or reply to it, and you may need to give them a call at 800-724-7486 if you still need help or replacement parts.
MarauderAirRifle.com is not owned, Affiliated, or controlled by Crosman.
The Scope and goal of this section of the form is provide useful information 24/7 because I realize that most of us play with the toys on weekends when big companies and telephone support is not always available.
Normally if problems occur during this window you are SOL until the next business day (and your fun is over)
So if you are having problems check or search here to see if it is a known issue and what steps can be taken to resolve the issue.
If you ask questions on this forum, I can not guarantee Crosman support will see the post or reply to it, and you may need to give them a call at 800-724-7486 if you still need help or replacement parts.
37 posts
• Page 3 of 4 • 1, 2, 3, 4
Re: Hard cocking and POI shift FIX!!!
by RayK » Tue Feb 17, 2015 3:12 pm
Alan is right, the three bolts sheared at the neck. There must have been fatigue from back and forth motion from fill/discharge.
I'm not sure if the bolts are countersunk into the valve enough to give the heads support, but that would be better if they were.
I believe it is just enough to give the heads a flat surface to snug up against.
The valves should be snug for sure. Even a little loosness will allow them to cock to the side when pressure is applied to the air tube.
Who knows what this individual actually did, but it is the only failure I've ever read/heard about - and he claims he shot over 25,000 pellets with fills of 4200 psi. And if he were shooting 100+ fpe, he probably was only getting 8 ish shots per fill.
If he had replaced those three bolts every 10,000 pellets, they should not have sheared. Right Doc?
Ray
I'm not sure if the bolts are countersunk into the valve enough to give the heads support, but that would be better if they were.
I believe it is just enough to give the heads a flat surface to snug up against.
The valves should be snug for sure. Even a little loosness will allow them to cock to the side when pressure is applied to the air tube.
Who knows what this individual actually did, but it is the only failure I've ever read/heard about - and he claims he shot over 25,000 pellets with fills of 4200 psi. And if he were shooting 100+ fpe, he probably was only getting 8 ish shots per fill.
If he had replaced those three bolts every 10,000 pellets, they should not have sheared. Right Doc?
Ray
25 W-rod | 8 shots @ 70 FPE -2% | 3100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
- RayK
- Posts: 5381
- Joined: Sat Jun 05, 2010 3:19 pm
Re: Hard cocking and POI shift FIX!!!
by Doc » Tue Feb 17, 2015 5:10 pm
I dont know about replacing them or just going to larger bolts. Last time I looked at the valve it had sufficient counterbore to allow the head to engage but the airtube may have a slight mechanical advantage over the valve on the bolt head. I wouldnt risk my life just trying it out. I would have to pressure test with hydraulic fluid to failure point then determine where the weak link is.
- Doc
- Posts: 541
- Joined: Fri May 23, 2014 11:47 am
- Location: Central Texas
Re: Hard cocking and POI shift FIX!!!
by Doc » Tue Feb 17, 2015 5:14 pm
25,000 pellets seams a bit of a stretch to me.
- Doc
- Posts: 541
- Joined: Fri May 23, 2014 11:47 am
- Location: Central Texas
Re: Hard cocking and POI shift FIX!!!
by RayK » Tue Feb 17, 2015 7:10 pm
That's about 71 tins of 350 Kings. Yes, that is a lot. Well it is the Internet and no one is checking anyone's facts.
Ray
Ray
25 W-rod | 8 shots @ 70 FPE -2% | 3100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
- RayK
- Posts: 5381
- Joined: Sat Jun 05, 2010 3:19 pm
Re: Hard cocking and POI shift FIX!!!
by caniborrowsomeammo » Tue Feb 17, 2015 7:56 pm
Someone on either the Yellow or GTA did a extereme pressure test on a Disco valve/tube. I can't find it though. IIRC, the tube gave way to the bolt heads. Bolts didn't shear.
- caniborrowsomeammo
- Posts: 398
- Joined: Sat Jun 11, 2011 4:30 pm
- Location: Santa Rosa
Re: Hard cocking and POI shift FIX!!!
by Doc » Tue Feb 17, 2015 8:22 pm
That was my point they shouldnt sheer unless only the threads are holding them. The tube or valve body should give way first.
- Doc
- Posts: 541
- Joined: Fri May 23, 2014 11:47 am
- Location: Central Texas
Re: Hard cocking and POI shift FIX!!!
by Doc » Tue Feb 17, 2015 8:25 pm
RayK wrote:That's about 71 tins of 350 Kings. Yes, that is a lot. Well it is the Internet and no one is checking anyone's facts.
Ray
Thats a lot of shooting. I should buy a tube with fill plug and valve. I worked for a hydraulics shop and I could pressure it to at least 6000 psi.
- Doc
- Posts: 541
- Joined: Fri May 23, 2014 11:47 am
- Location: Central Texas
Re: Hard cocking and POI shift FIX!!!
by oldpro » Wed Feb 18, 2015 4:10 pm
I have a customer with a Nitrogen tank who on accident filled gun to max pressure in said tank I forgot what the pressure was but! what happened was the air tubed swelled around the valve and blew the valve oring out and degassed the gun. Maybe Crosman has this fail safe built in but HELL if im going to try it LOL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For WAR products, please visit my vendor shop on the Marauder Forum http://www.marauderairrifle.com/shops/w ... ir-rifles/
For WAR products, please visit my vendor shop on the Marauder Forum http://www.marauderairrifle.com/shops/w ... ir-rifles/
- oldpro
- Posts: 770
- Joined: Fri Sep 13, 2013 8:33 pm
Re: Hard cocking and POI shift FIX!!!
by RayK » Wed Feb 18, 2015 9:02 pm
I wish he had video of that.
Did you get any pictures of the air tube or other parts?
Ray
Did you get any pictures of the air tube or other parts?
Ray
25 W-rod | 8 shots @ 70 FPE -2% | 3100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
25 M-rod | 40 shots @ 35 FPE -4% | 3100 fill
22 M-rod | 51 shots @ 25 FPE -4% | 3100 fill
17 M-rod | 60 shots @ 19 FPE -4% | 2500 fill
25 P_rod | 16 shots @ 28 FPE -4% | 2100 fill
- RayK
- Posts: 5381
- Joined: Sat Jun 05, 2010 3:19 pm
Re: Hard cocking and POI shift FIX!!!
by Doc » Wed Feb 18, 2015 9:22 pm
A video would have been great. I bet he needed to change his underwear when the orings let go.
- Doc
- Posts: 541
- Joined: Fri May 23, 2014 11:47 am
- Location: Central Texas
37 posts
• Page 3 of 4 • 1, 2, 3, 4
Return to Marauder Problems and Solutions
Who is online
Users browsing this forum: No registered users and 2 guests
