After I had some issues with my Demon, I thought I would create a guide with the aim to show people how to fix common problems.
Make sure you clean off all old lube first with a microfibre cloth so you do not scratch any part of the drive train.
The Drive Train
The Drive Train is the entire bolt system. It is what controls the air flow used to propel the paintball.
The Bolt Guide
You need to lube the following o-rings:
(drive o-ring - or bolt seal o-ring) - If you have a leak in the grip frame, check this for nicks/damage and replace.
(bolt tip o-ring) - If you have a leak down the barrel, check this o-ring for nicks/damage and replace. Also, if you have a slow bolt cycle or chopping paint, change it too.
You do not
need to lube the following o-rings:
(bumper seal o-ring)
(back cap oring) - If you remove the back cap, there is a 021 o-ring in here. Only replace if you get a leak out of the back cap / back of guide.
Pop the 014
o-ring off the tip with your finger as it makes it easier to slip the bolt through the bolt can. There aren't any o-rings in this section that need changing other than the 014
o-ring as it is the main o-ring to get worn. If it you notice worn detents, replace this o-ring. You need to ensure the tip and 014
o-ring is free of lube.
As for lubing, apply a good amount of lube to the flat areas of the bolt, as these will be the areas of movement and will need a good coating applied. Don't go overboard - just enough to show the colour of the lube.
The Bolt Can
Inside of Bolt Can
If you look inside the bottom of the bolt can, you will see a 019
o-ring positioned around half way up the inside of the bolt can. This is the bolt sail o-ring and if there is a problem with it, it will cause First Shot Drop Off (FSDO
) or fail to cycle the bolt properly. You will need to lube this o-ring by placing some lube on your finger, and pushing your finger up inside the bolt can and apply it to 019
If you look inside the top end of the bolt can, you will see a few more o-rings. Some are Ni (Buna) o-rings and some are Polyurethane. The 017
o-ring marked A)
is a Buna o-ring and is the Bolt Drive o-ring. It is the main force o-ring and will takes around 20-35 cases to see wear on it.
Next up are the two 017 Polyurethane
o-rings marked B)
. The one next to the Bolt Drive o-ring is called the Fill Shut Off o-ring and is used to shut off the fill after the bolt has cycled.
The other 017
o-ring on the inside of the tip of the bolt can is the Bolt Guide o-ring and if you have a leak down the barrel, check this.
All three o-rings need to be lubed.
Outside of Bolt Can
There are four 021
o-rings here; three are bunched together and one near the front of the bolt can. If you have a leak down the barrel, check the front 021
o-ring for damage. If the mid 021
o-ring is damaged, it cause bolt stick as leaking air can get trapped on the inside of the can by creating a pocket of air.
Just lightly lube all 4 o-rings with any left over lube on your fingers.
When you re-assemble the drive train, make sure there is no lube on the 014
o-ring that you took off the bolt and put it back on.
Thanks to ShootnPoo for the video guide: