Hammer Spring adjustment for Crosman 150/157

[JKT]

I have seen three variations of the Hammer Assembly for the Crosman 150: a single power cocking assemble, a high and low power cocking assembly and I saw a gun for sale on Ebay that had an adjustable cocking assembly. I am not sure how that worked, all I saw was that the part that you pull back to cock the gun had an arrow on it showing you could increase the power by rotating it in one direction. I assume it uses a threaded shaft to increase or decrease the spring tension

I have a high/low power cocking mechanism on my Crosman 150. If you pull it back to the first click, the shear holds the hammer at less than full cock position, then releases it with less spring tension, which therefore opens the exhaust valve less. The high power position pulls the hammer further back and increases the spring tension, so that when the gun is fired, the exhaust valve is opened further and provides more CO2 to send the pellet down the barrel. 

Unlike the newer Crosman 2240, which allows one to modify spring tension by use of a spring tensioning device, the Crosman 150/157 have a one piece combination hammer, hammer spring, and cocking assembly, that as far as I can tell cannot be readily disassembled to allow a stronger hammer spring to be added.

i found a way to increase the spring tension by adding a washer or two between the existing spring and the part of the assembly that cocks the gun.

i have uploaded a video on my YouTube Channel: Eagle View HD. The video is titled Hammer Spring Adjustment on a Crosman 150.

 

[marflow]

so once upon a time a bought a Crosman 400 and when I got it I found the cocking mechanism had that little shaft spring missing and found and bought a another one and threw the other one in the parts bin

so after a while I decided to fix it, I couldn't get it part so I bought a spring that looked like it would work and started that spring and just wound it on the rod and it worked fine

so my point is if you where to change that spring with something stiffer you might get a stronger hammer thump and more power, is it risky maybe

 

[AirNGasman]

Crosman 150s with the hammer-spring-tension (power) adjustment feature have a little hole in the ass-end of the cocking knob. If your's does and you need help figuring it out, feel free to call me at 254-253-1239, noon till midnight CST any day (I'm retired).

 

[JKT]

My Crosman 150 does not have the little hole in the cocking knob. It has two cocking positions. You can pull it part way out and it will cock at low power or you can pull it all the way out and it will cock at full power. 

I went out shooting mine the other day and I got over 100 shots from a single 12 gram CO2 cartridge at full power. It was perfect for plinking around 10 - 15 yards. 

I saw a Crosman 157, Type 1 on Ebay that had an arrow engraved on the cocking knob, that showed you turned the knob to adjust the power. It did not have the small hole in it either. 

I am satisfied with the power my Crosman 150 is putting out at present. How many shots do you get from a single CO2 cartridge? Despite the low power output of my 150, it is still very loud when I shoot it.