Something happened to my 48? **Update**

[1BadDart]

Butch
The trigger assembly is clean and lubed, also I loosened the front screw and it was no help. Today while in the shop I drove the cocking stem back in the old piston and if I have time after church tomorrow I think I'll put the old piston back in just to see what it does. I know the stem won't stay long but at least it'll tell me if it's the new piston assembly or in my trigger assembly. I also need to measure the ends of both stems to check the diameters.

 

[1BadDart]

I think I figured it out, googled the P/N 305360 (the one Umarex sent) and it comes up for a 48 with a TO5 trigger. My rifle is a TO6 and should use P/N 307773. I've always been lucky this way.

 

[Butch]

You know that was what I was wondering when looking at that pic. You would think the latch rod would be the same from the t05 to the t06 but appears it is not interchangeable. I have never worked on a t05 gun. 

 

[1BadDart]

I called Umarex Monday AM and got my piston deal fixed, no questions asked. It arrived today so to the shop I went to change the pistons out. I did polish the skirt on the piston and the end of the stem before installing it.

It appears that Diana has realized there is a problem with the design of the piston. As you can see in the photo there is another row of crimps closer to the seal end of the head on the new piston. Also the crimps in the original location are .020" or so deeper. The red marks are where the head slug ends.

BTW the TO5 piston has the extra crimps too.

 

[Butch]

I take that you got it back shooting again? 

 

[1BadDart]

Yep, the scope is back on and ready to re zero, I did run 25-30 pellets with open sights just to make sure all is well.

 

[Butch]

Happy to hear you got it fixed. Think you’ll like that Vortek kit too. 

 

[mcoulter]

Congrats! And that's cool to see they've modified their crimping.

I had to send my original piston back to Umarex. It should have arrived there today. Hopefully I'll know more about mine tomorrow or sometime next week

 

[mcoulter]

Umarex treated me right. I received my replacement piston this week. Yes, it took while, but much of that delay was on me. Work has been too busy... Hopefully I will have it back together this weekend

 

[1BadDart]

Good deal, glad they took care of it.

 

[Butch]

Glad both of you got treated right. Good to know the company takes care of their customers. My experience was good as well. 

 

[wrhinehart]

What did we ever do without the internet to assist us fixing things?

 

[mcoulter]

Exactly!!!

(I guess we bought more books and manuals.)

 

[mcoulter]

My replacement piston had the same extra crimping. But they were more shallow than what I see on your new piston. I hope to chrony my rifle this weekend

 

[1BadDart]

Mine averaged 803 fps with H&N FTT 14.66 gr at 50° with the Vortek spring and factory seal.