jmorris
Member
- Joined
- Sep 30, 2005
- Messages
- 24,105
The first gun given to me was a Benjamin .22 cal air rifle when I was 11 but it has been dead for years due to worn out parts. After ordering an RWS 34 to play with I came across a rebuild kit from Pyramyd air that cost about $28 including the special tool to take them apart (I was quoted $100 to rebuild it years ago).
Start by removing the stock screw and stock. Then remove the two roll pins that hold the muzzle cap inplace and bring the piston/rod back far enough to line up the pump handle pin with the lower muzzle cap hole and remove that pin. Now you can replace the piston head.
Next remove the trigger/safety (don't loose the detent ball for the safety) and rear retaining cap. The spring and hammer are under a little pressure but not too much, in any case remove these parts.
They send a tool that is square on one end that allows you to remove the retainer for the valve body.
Opposite the square end of the tool, it is threaded to remove the valve guide. This took some "tapping" to get this out of mine.
The kit comes with all of the seals you need to replace and a new check valve spring but I did reuse the original lead washer instead of the PTFE split washer they provided.
Be VERY careful reassembling the valve body retainer. If you mess up the threads, both are brass and fine thread, you are going to be SOL. I put the tool in a vise and rotated the tube around while keeping everything in alignment. This too will take a little pressure (I also used air tool oil).
Then reassemble the rest like it came apart. I also cleaned everything once I had it all apart.
Before it wouldn't hold enough air to move a pellet and I have no idea what they are supposed to be but with a 14.3g pellet
3 pumps avg 407 fps
5 pumps avg 507 fps
10 pumps avg 647 fps
5 pumps and let it sit for half an hour went 505.6 with a second 5 pump shot right after going 505.0, so I guess old faithful is back in business.
Start by removing the stock screw and stock. Then remove the two roll pins that hold the muzzle cap inplace and bring the piston/rod back far enough to line up the pump handle pin with the lower muzzle cap hole and remove that pin. Now you can replace the piston head.
Next remove the trigger/safety (don't loose the detent ball for the safety) and rear retaining cap. The spring and hammer are under a little pressure but not too much, in any case remove these parts.
They send a tool that is square on one end that allows you to remove the retainer for the valve body.
Opposite the square end of the tool, it is threaded to remove the valve guide. This took some "tapping" to get this out of mine.
The kit comes with all of the seals you need to replace and a new check valve spring but I did reuse the original lead washer instead of the PTFE split washer they provided.
Be VERY careful reassembling the valve body retainer. If you mess up the threads, both are brass and fine thread, you are going to be SOL. I put the tool in a vise and rotated the tube around while keeping everything in alignment. This too will take a little pressure (I also used air tool oil).
Then reassemble the rest like it came apart. I also cleaned everything once I had it all apart.
Before it wouldn't hold enough air to move a pellet and I have no idea what they are supposed to be but with a 14.3g pellet
3 pumps avg 407 fps
5 pumps avg 507 fps
10 pumps avg 647 fps
5 pumps and let it sit for half an hour went 505.6 with a second 5 pump shot right after going 505.0, so I guess old faithful is back in business.
Last edited:
