If I recall correctly, you need to remove the barrel pivot screw and barrel in order to remove the draw barfrom the piston..........this is required because it is a solid rod.Had it been articulated, this would not be necessary....It's been a while,tho. I could be incorrect......I have to remove the barrel in order to use my spring compressor,but the 95 can be assembled with the ram discharged, then aired up after assembly......
A fair amount of force will be needed to pre-load the Vortex, but I do not recall it being excessive...May be a couple hundred pounds, but that is easy stuff for a C-clampMake sure you are pushing against that flat step of the plug just behind the air tube cylinder...You may want to make a test press by removing the plug/safety assy and inserting a socket or something to allow you to push against only the rear block of the ram........ If that moves, then your troubles will lie with the rear plug/safety stuff......Maybe, if the ram moves and the holes line up, insert a pin, then put the rear plug in. Insert the rearmost pin,then remove the front pin in order to install the trigger group.. I think that'll work (BUT... I could be wrong...)Been too long.........I typically assemble with NO pressure in the Vortex........I air it up after assembly is complete....much easier....
When compressing a coil spring into a rifle the force STARTS at "0". If you need 2" of spring preload on a 40lb/inch spring the clamp force increases linearly from "0" to 80 lbs where you can try to slide in a retaining pin.Air and gas springs have a significantly different force profile. You may only need 1/8" to 1/4" of preload distance but the force STARTS at 150lbs-180lbs. The compressor REALLY LOADS UP before there is ANY movement of the Vortex. It FEELS like something is WRONG. There COULD be something out of place but I think it may just be you are not familiar with working on gas/air spring rifles.After working on a few of them you will be a lot more comfortable with the different behavior.Best Wishes :-)
for Ronno6-- Which NP ram do you (or perhaps MikeyB could chime in as well) recommend to retrofit in the 95? Can we assume we can get about the same power levels using the NP ram? And are the NP rams cheaper to purchase? I think the Vortex ram for the 95 is around $50 or so.
Someone here (GTA) replaced a leaky Vortex with a NEW one but could not get it to fit. I think they had to trim something like a half mm (0.020" ?) off the end of the new Vortex to get all the holes to line up properly with the holes in the comp-tube. That seems possible based on some of the "loose" tolerances I've measured on other Hatsan parts.I'll see if I can find the post and provide a link.BEFORE trimming ANYTHING I would take the calipers to several parts to identify if one of the dimensions REALLY NEEDS trimming.I know it is discouraged but I made a small hardwood mallet that I use to coax in stubborn cross-pins. Most of the time I DON'T need to use it, but sometimes a few GENTLE taps helps things move forward.
Quote from: mikeyb on November 18, 2024, 12:28:46 AMSomeone here (GTA) replaced a leaky Vortex with a NEW one but could not get it to fit. I think they had to trim something like a half mm (0.020" ?) off the end of the new Vortex to get all the holes to line up properly with the holes in the comp-tube. That seems possible based on some of the "loose" tolerances I've measured on other Hatsan parts.I'll see if I can find the post and provide a link.BEFORE trimming ANYTHING I would take the calipers to several parts to identify if one of the dimensions REALLY NEEDS trimming.I know it is discouraged but I made a small hardwood mallet that I use to coax in stubborn cross-pins. Most of the time I DON'T need to use it, but sometimes a few GENTLE taps helps things move forward.My calipers have a dead battery. The new gas ram came with a new end cap. I compared the new end cap with the original and they are the same size. No problems there that I see.I then measured the new and old gas rams. The new gas ram measures just at 6 and 5/8 inches from the brass ring to the end of the assembly. I did not measure the gas piston rod. The old gas ram measures between 6 9/16 and 6 5/8 inches from brass ring to end of the assembly. The body of the new gas ram to the end of the assembly is longer than the original. I believe this is the problem. I could contact Hatsan to send me another, but risk being in the same situation. Or I can grind off the difference. My head is leaning toward Hatsan owning this one. Michael, thanks for presenting the fact that someone else had this issue.
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