Just takes a tear down of the gun, a high pressure hand pump and a Hatsan fill probe. If memory serves from another post on this, the rams in the pistols should be filled to 100 bar. It also works on their air rifles.You'll also need one of these to connect that fill probe to the air line:https://www.pyramydair.com/product/air-venturi-male-quick-disconnect-1-8-bspp-female-threads-steel-rated?a=3550
This weekend when I get time I will post pics and show you step by step how it is done. You can get the fill probe and pump from amazon for about 70 bucks. Very simple to do!!
Yosoo high pressure hand pump $57 (amazon) Air venturi quick disconnect 1/8 bspp $14 (amazon)Hatsan fill probe 19.99(hatsan web site)You can spend as much as you want on a hand pump.I just got the cheapest one I could find.As far as the air pressure goes Hatsan says optimal air pressure is 100 bar.As near as I can tell mine only had about 70 bar. After I put in 100 bar the cocking effort was somewhat stouter and velocity incressed to just under 700 f.p.s. shooting a JSB 7.33 grains and 735 f.p.s. with 6.9 grains. I would not even think about going over 100 bar myself as it will make it harder to cock with a harsher shot cycle.
Yes both are correct. The quick disconnect screws to the fill probe.
The first thing you must do is remove the three stock screws you have one on each side and one in the bottom rear. Then remove the stock. locate the fill port and install the fill probe. The fill probe connects to the hand pump connector. Then pump to 10 mpa/100 bar. Remove fill probe and put stock back on. its that simple. There is a degassing screw that releases the pressure on the ram if you ever need to remove the ram its a lot faster that messing with a spring compressor. Make sure you follow the directions on your hand pump instructions. hope this helps!!
Quote from: Airnut on August 11, 2018, 06:05:19 PMThe first thing you must do is remove the three stock screws you have one on each side and one in the bottom rear. Then remove the stock. locate the fill port and install the fill probe. The fill probe connects to the hand pump connector. Then pump to 10 mpa/100 bar. Remove fill probe and put stock back on. its that simple. There is a degassing screw that releases the pressure on the ram if you ever need to remove the ram its a lot faster that messing with a spring compressor. Make sure you follow the directions on your hand pump instructions. hope this helps!!You, good sir, are awesome!-W
Quote from: splitbeing on April 16, 2020, 10:23:14 PMAny hand pump will do. I use one of the inexpensive ones from China bought on eBay that are discussed here on GTA. You will also need the Hatsan fill probe and the foster adapter to connect it to the pump. I had one for a flashpup already. I learned the pistons could be adjusted here on GTA. I’ll see if I can find the thread.Thanks! Can anyone recommend specific pumps, fill probes, and foster adapters and the best place to buy them from online?-C
Any hand pump will do. I use one of the inexpensive ones from China bought on eBay that are discussed here on GTA. You will also need the Hatsan fill probe and the foster adapter to connect it to the pump. I had one for a flashpup already. I learned the pistons could be adjusted here on GTA. I’ll see if I can find the thread.
Ya looks about right. Just make sure the probe will fit a mod 25.I would not go over 100 bar on the ram. I filled mine to 120 and had trouble with the piston grinding on the compression tube when cocking. I rectified it by installing piston buttons. Keep in mind that the ram is only rated at 100 bar.
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