Tag Archives: cylinder

How to Degas / Depressurize a Hatsan Gladius Cylinder

The Hatsan Gladius is a really cool bullpup precharged pneumatic (PCP) air rifle.  One really neat feature is that you can simply unscrew the air cylinder and install another.  A second cylinder is way easier to carry around than an air tank of you are hunting or doing pest control.  Also, you can have different cylinders regulated at different pressures that are tuned for combinations of pellets and distances.  Now the base rifle is not regulated and really all a spare cylinder does is give you a backup air source.  I’ll cover installing a Huma regulator in another post but this one will focus on how to degas, or empty, the air cylinder of the Hatsan so maintenance can be done.  For example, if you want to drain moisture, etc.

First, I need to give you a safety message.  A Hatsan Gladius cylinder may contain up to 3,000 PSI of air pressure in it.  This kind of pressure is dangerous.  Do not mess around when you are working with high pressure air (HPA) or you may get injured or killed.  Respect it and be cautious.  If you haven’t read the manual for your Gladius, do so.  If you lost your manual, click here for an online copy at Hatsan.

Okay, depressurizing the cylinder is very, very simple.  Hatsan includes the tool you need in the small white tool box that came in the original case with your rifle.  It consists of a heavy brass cap with a set screw in it and the appropriate sized Allen key.  The first step is to back the set screw out so when you thread it onto the cylinder it does not touch the conical shaped nipple on the end of the cylinder.  The third photo shows what the set screw will look like when you back it out.  You want to be able to screw the brass cap on all the way without that set screw touching.

  

Next, thread the brass tool all the way onto the cylinder by hand.  Do not turn the set screw until the cap is fully seated.  Note the little vent hole shown in the next photo.  This is where the air will vent.

Now, turn the vent hole away from you and do NOT look straight at it to protect your eyes.  Very slowly turn the set screw clock wise.  As it threads into the body of the cap, it will depress the conical nipple and high pressure air will start to vent.  It’s going to act like a jet and you will feel the cylinder move. I don’t advocate cranking it wide open so you don’t blow dust every where and you can maintain control of the cylinder.  It will empty very fast. In the next photo, you can see the set screw turned in.  The only reason the vent hole is showing is for the photo.  Normally I have it turned away from me.

Last step – the cylinder should be empty when you no longer hear air exiting.  Double check the gauge.  To remove the end of the cylinder should be very easy because Hatsan uses some form of silicone grease on the threads and doesn’t tighten it much.  If it is taking a ton of force, double check the gauge as there may be air in the cylinder.

That’s all there is to it.  I hope this helps you out.


If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


Hatsan Gladius LONG Air Rifle - 22 Caliber

$649.99
End Date: Friday Dec-21-2018 8:52:41 PST
Buy It Now for only: $649.99
Buy It Now | Add to watch list

New Hatsan Gladius Long .22 Caliber PCP Air Rifle HG-GladLONG22

$679.99
End Date: Saturday Jan-5-2019 10:02:12 PST
Buy It Now for only: $679.99
Buy It Now | Add to watch list

New Hatsan Gladius Long .177 Caliber PCP Air Rifle HG-GLADLONG177

$679.99
End Date: Saturday Dec-29-2018 11:03:20 PST
Buy It Now for only: $679.99
Buy It Now | Add to watch list

New Hatsan HG-GladLONG22 Gladius Long PCP Air Rifle .22 Caliber

$650.00
End Date: Friday Jan-4-2019 16:06:40 PST
Buy It Now for only: $650.00
Buy It Now | Add to watch list

Hatsan HG-Glad177 Gladius PCP 177/22 Cal Pellet Air Gun Rifle

$564.79
End Date: Wednesday Dec-12-2018 13:03:40 PST
Buy It Now for only: $564.79
Buy It Now | Add to watch list

HG-GladLONG 22 Hatsan Gladius LONG Air Rifle - 22 Caliber HG-GladLONG 22

$673.99
End Date: Tuesday Dec-18-2018 8:30:09 PST
Buy It Now for only: $673.99
Buy It Now | Add to watch list

Hatsan Gladius Air Rifle - 22 Caliber

$799.98
End Date: Friday Dec-21-2018 8:52:37 PST
Buy It Now for only: $799.98
Buy It Now | Add to watch list

Hatsan Gladius PCP Air Rifle .25 Caliber HG-Glad25

$777.26
End Date: Thursday Jan-10-2019 21:18:06 PST
Buy It Now for only: $777.26
Buy It Now | Add to watch list

Hatsan Gladius PCP Air Rifle .22 Caliber HG-Glad22

$744.46
End Date: Thursday Jan-10-2019 21:18:05 PST
Buy It Now for only: $744.46
Buy It Now | Add to watch list

Hatsan Gladius Bullpup Long PCP Air Rifle

$1,000.00
End Date: Wednesday Jan-9-2019 18:15:07 PST
Buy It Now for only: $1,000.00
Buy It Now | Add to watch list

Hatsan Gladius Bullpup Stock Design - 0.22 cal

$799.99
End Date: Sunday Dec-16-2018 20:30:22 PST
Buy It Now for only: $799.99
Buy It Now | Add to watch list

Hatsan Gladius Bullpup Stock Design - 0.22 cal

$799.99
End Date: Sunday Dec-16-2018 20:30:20 PST
Buy It Now for only: $799.99
Buy It Now | Add to watch list

Hatsan Gladius Long PCP Air Rifle .22 Caliber HG-GladLONG22

$697.80
End Date: Thursday Jan-10-2019 21:18:06 PST
Buy It Now for only: $697.80
Buy It Now | Add to watch list

Hatsan Gladius Bullpup Long .25 cal PCP Air Rifle (Refurb)

$800.00
End Date: Wednesday Jan-9-2019 19:30:42 PST
Buy It Now for only: $800.00
Buy It Now | Add to watch list

HG-Glad 22 Hatsan Gladius Air Rifle - 22 Caliber

$740.49
End Date: Tuesday Dec-18-2018 8:30:33 PST
Buy It Now for only: $740.49
Buy It Now | Add to watch list

Hatsan Gladius Bullpup .22 cal PCP Air Rifle (Refurb)

$760.00
End Date: Wednesday Jan-9-2019 19:35:19 PST
Buy It Now for only: $760.00
Buy It Now | Add to watch list

Hatsan Gladius Bullpup .177 cal PCP Air Rifle (Refurb)

$760.00
End Date: Wednesday Jan-9-2019 19:25:29 PST
Buy It Now for only: $760.00
Buy It Now | Add to watch list

Hatsan stainless quick coupler Airgun Charging / Filling Adaptor Probe

$20.03
End Date: Wednesday Dec-19-2018 11:23:04 PST
Buy It Now for only: $20.03
Buy It Now | Add to watch list

Hatsan Gladius Fill Cylinder

$139.00
End Date: Tuesday Jan-1-2019 23:07:06 PST
Buy It Now for only: $139.00
Buy It Now | Add to watch list

Hatsan Gladius Long PCP Air Rifle .22 Caliber 23" 10 Rounds Synthetic Stock

$1,078.31
End Date: Sunday Dec-30-2018 6:42:26 PST
Buy It Now for only: $1,078.31
Buy It Now | Add to watch list

Hill MK4 PCP HPA Hand Pump O-ring Reseal Piston Kit

$9.60
End Date: Sunday Dec-23-2018 7:42:55 PST
Buy It Now for only: $9.60
Buy It Now | Add to watch list

Brand New Air Venturi MK4 by Hill Hand Pump + Up to 4500 PSI

$173.99
End Date: Friday Dec-28-2018 14:32:29 PST
Buy It Now for only: $173.99
Buy It Now | Add to watch list

Hill MK4 air rifle PCP hand charging pump(4128-005)

$220.00
End Date: Tuesday Dec-25-2018 12:00:49 PST
Buy It Now for only: $220.00
Buy It Now | Add to watch list

Hill MK4 PCP HPA Hand Pump O-Ring Service Kit

$14.70
End Date: Sunday Dec-23-2018 7:40:50 PST
Buy It Now for only: $14.70
Buy It Now | Add to watch list

Hill Hill MK4 Hand Pump Complete Seal Kit

$46.08
End Date: Friday Dec-14-2018 13:10:42 PST
Buy It Now for only: $46.08
Buy It Now | Add to watch list

Hill MK4 PCP HPA Hand Pump O-Ring Rebuild Reseal Service Kit with Micron Filter

$49.99
End Date: Saturday Dec-22-2018 8:49:57 PST
Buy It Now for only: $49.99
Buy It Now | Add to watch list

Hill Hill MK4 Hand Pump Micron Filter Replacement

$21.95
End Date: Friday Dec-14-2018 13:10:26 PST
Buy It Now for only: $21.95
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump Up to 4500 PSI Air ( Great Seller )

$185.00
End Date: Thursday Jan-3-2019 9:54:30 PST
Buy It Now for only: $185.00
Buy It Now | Add to watch list

"Hill Hill Pump MK4, Up to 4000 PSI"

$259.99
End Date: Saturday Dec-22-2018 6:43:56 PST
Buy It Now for only: $259.99
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI

$240.00
End Date: Tuesday Jan-8-2019 18:02:14 PST
Buy It Now for only: $240.00
Buy It Now | Add to watch list

Hill MK4 PCP HPA Hand Pump O-Ring Rebuild Reseal Service Kit with Micron Filter

$45.00
End Date: Monday Dec-31-2018 18:01:08 PST
Buy It Now for only: $45.00
Buy It Now | Add to watch list

Air Venturi AV/Hill MK4 Hand Pump 4500 psi

$199.00
End Date: Tuesday Dec-18-2018 17:32:30 PST
Buy It Now for only: $199.00
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI

$204.99
End Date: Friday Jan-4-2019 15:36:03 PST
Buy It Now for only: $204.99
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI

$249.99
End Date: Tuesday Jan-8-2019 17:31:35 PST
Buy It Now for only: $249.99
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI

$179.88
End Date: Saturday Dec-15-2018 9:50:41 PST
Buy It Now for only: $179.88
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI

$249.99
End Date: Sunday Dec-16-2018 7:40:05 PST
Buy It Now for only: $249.99
Buy It Now | Add to watch list

Air Venturi MK4 by Hill Hand Pump, Up to 4500 PSI -NEW

$215.00
End Date: Thursday Jan-3-2019 17:57:09 PST
Buy It Now for only: $215.00
Buy It Now | Add to watch list