Crosman 1720T - Manual (Page 3)

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B. Pressurizing (Filling) the Airgun with a High Pressure Tank
The 1720T may be filled from a high pressure tank (bottle). Scuba style tanks designed for 3000 psi pressures
and above are best suited for the task as they can fill the 1720T many times to 2500-3000 psi. For scuba
tanks use the Crosman FAH003 Scuba Yoke Adapter for K style valves or the FAH004 DIN style Adapter for
DIN style valves.
• Be sure to wear eye protection.
• Make sure the airgun is unloaded and not cocked.
• (See section 4 for instructions on unloading and un-cocking.)
• Read all instructions with your tank so you are familiar with its operation.
• Put the airgun “ON SAFE” (see section 2A).
• Point the airgun in a SAFE DIRECTION.
• Remove the cap that covers the fill nipple on the airgun.
• Connect the quick-disconnect fitting on the adaptor’s hose to the fill nipple (fig. 3).
• Slowly open the valve on your tank and start filling the gun SLOWLY. Filling too quickly will cause heat
buildup that can affect accuracy of the fill pressure.
• Watch the gauges on the airgun and your tank (if equipped) until the desired pressure is reached (2500 -
3000 psi) DO NOT fill the airgun to more than 3000 psi. See “Overfill” information in section 3C.
• Turn the valve on your tank off when the desired fill pressure is reached.
• Follow instructions with your tank and hose to BLEED the fill hose COMPLETELY to avoid hose whip from
pressure in the fill hose
• Disconnect the tank’s fill hose from the fill nipple on the airgun.
• Replace the cap over the fill nipple. Always keep the fill nipple capped to eliminate the possibility of dirt
entering the check valve.
TIP: If your airgun is being filled from completely empty (zero pressure) the tension of the hammer pressing
against the valve may keep the valve open which causes air to leak down the barrel. This is most likely to hap-
pen with a gun where the hammer spring is adjusted to a high rate. In the event this occurs try cocking the
bolt and leaving it in the rear (fully open) position to eliminate the force on the valve allowing it to close. Always
make certain the airgun is not loaded and there is not a pellet in the chamber.
TIP: Pressurizing the airgun causes heat which in turn will register a higher pressure. Always fill slowly and
allow the reservoir to cool to obtain the most accurate fill pressure. Topping off the reservoir after it is allowed
to cool is recommended.
C. Overfill:
• Over filling beyond the “as tuned” best fill pressure does not improve performance. It lessens performance
and may cause the valve to lock. For instance a gun tuned for best performance at 2,500 psi may partially
valve lock at 3000 psi. If you discover that the airgun has been over filled, try to dry fire the airgun (cock
and shoot with no pellet loaded) in a SAFE DIRECTION until the pressure on your airgun drops to the
pressure where your gun was tuned to perform best.
• If the airgun will not discharge air with each shot, the valve may be completely pressure locked and
require use of the degassing tool PCPDT4 available at www.crosman.com , or contact Crosman Cus-
tomer Service at 1-800-724-7486.
D. Depressurizing the Airgun
• Keep the pistol pointed in a SAFE DIRECTION.
• Remove all the air from your pistol by repeatedly cocking and dry-firing with the pistol pointed in a SAFE
DIRECTION) until the pressure gauge on your airgun shows no pressure on the gauge and air cannot be
heard when the gun is dry fired.
• Put the airgun “ON SAFE”.
• If the pressure in the gun cannot be relieved using the dry firing process it may indicate a valve lock condi-
tion and require use of the degassing tool PCPDT4 available at www.crosman.com , or contact Crosman
Customer Service at 1-800-724-7486.
4. Cocking, Loading, Unloading and Uncocking the Airgun
WARNING:
Use .177 caliber pellets only in your airgun. Never reuse ammunition. Use of any other
ammunition can cause injury to you or damage to the airgun.
A. Cocking and Loading Pellets
• Put the airgun “ON SAFE” (see section 2A) and point in a SAFE DIRECTION.
• Be sure your airgun is properly pressurized (see section 3).
• Open the bolt by pushing the bolt handle up and pulling it all the way back. With the bolt in the rearward
position, place one pellet, nose first, into the loading tray. This is a single shot pellet airgun. Load no more
than one pellet at a time.
• Lightly push the pellet into the barrel by closing the bolt and pushing the bolt handle down to lock. DO
NOT jam the bolt forward. This will damage your airgun.
• Be sure the bolt is closed and locked before firing. If it is not closed and fully locked, the pellet may not be
discharged.