Maintenance Evol receiver disassembly instructions?

[Airgunsruinedmylife]

Does anyone have any detailed instructions on how to remove the probe, hammer, regulator gauge and valve? I have the schematics, but they are not doing much for me. It is for an Evol Mini.

 

[Airgun-hobbyist]

Does anyone have any detailed instructions on how to remove the probe, hammer, regulator gauge and valve? I have the schematics, but they are not doing much for me. It is for an Evol Mini.

It's a rather involved event for a not so common leak area. Are you sure there's a leak in the valve area?

 

[Airgun-hobbyist]

The common leak areas on the Evol are the regulator and air cylinder o-rings. It's a easy fix for those. The valve and related o-rings require the pins of the trigger assembly be removed and associated screws on the hammer weight and cocking arm pivot be removed to access the valve.

In the Maintenance Section there's a write-up on my modified assembly procedure to help you with the air cylinder and regulator o-rings.

Maintenance - Modified assembly procedure for the regulator and air cylinder on original Evol models...

Overview of the long post: On the original generation Evol's, to prevent the threads cutting the o-rings upon re-assembly, first install/push the regulator deep down into the air cylinder so the o-ring is just past the threads. Then screw on the air cylinder onto the receiver, ensuring the...

community.hardairmagazine.com

 

[Airgunsruinedmylife]

The common leak areas on the Evol are the regulator and air cylinder o-rings. It's a easy fix for those. The valve and related o-rings require the pins of the trigger assembly be removed and associated screws on the hammer weight and cocking arm pivot be removed to access the valve.

In the Maintenance Section there's a write-up on my modified assembly procedure to help you with the air cylinder and regulator o-rings.

Maintenance - Modified assembly procedure for the regulator and air cylinder on original Evol models...

Overview of the long post: On the original generation Evol's, to prevent the threads cutting the o-rings upon re-assembly, first install/push the regulator deep down into the air cylinder so the o-ring is just past the threads. Then screw on the air cylinder onto the receiver, ensuring the...

community.hardairmagazine.com

It's a rather involved event for a not so common leak area. Are you sure there's a leak in the valve area?

I just want to know for future reference. I feel like it will more than likely leak in that area down the road. Does the drive pin bolt get pushed out from the trigger area as well?

 

[Bladebum]

That would be very hard to put into words in detail, much easier to do video or pics.

With that said, I can almost guarantee you your valve will not leak. Its just a tapered delrin bell seal on a piece of rod and it comes out the air side, not the chamber side. If you are worried about the orings around the valve body leaking, just stop worrying they won't. I took my entire valve assembly apart for a separate issue and checked those o rings while it was out and they were flawless. They don't hold pressure they just stop leakage in the milliseconds air is transferring to the barrel.

To change any of the seals on gun, just degass by loosening the burst disk, let bleed completely then disassemble. You do need to take the barrel off with the proprietary evol wrench first, but nothing in the action needs disassembly.

Fwiw, when you go to reseal one day I highly recommend you replace the two main large air tube seals(122 size) with CAST poly seals instead of the viton. The viton material is good for sealing properties but it doesn't handle the forces of assembly/disassembly very well and can cause alot of headaches.

 

[pan60]