Pump Reviving a Crosman 147 pump air rifle

[geosar]

I have the above rifle which I was given new in the 1950's. It has the safety through the stock, .177 cal and has not been shot since the late 1950's I have purchased the required reseal parts and installed everything as per instructions by our colleagues on youtube. I have a new pump cup and felt insert as well as new O rings and check valve parts.

It appears to be pumping but I cannot get it to shoot when I pull the trigger. The trigger does not seem to be cocking the check valve arrangement properly. As you might suspect this is my first time attempting this projects. I moved the trigger spring to make the trigger more stiff attempting to get it to lock into the valve mechanism. No luck.

With this probably inadequate description are there any suggestions to get the trigger to set properly to let the valve hold pressure and then shoot?

Thank you

George

Arizona

 

[PapaT]

Just trying to make sure I understand current conditions. The gun has at least 1 pellet in it, suspected that it builds up air pressure, but trigger pull is not releasing air to fire pellet out of barrel. Does this sound accurate?

 

[geosar]

Just trying to make sure I understand current conditions. The gun has at least 1 pellet in it, suspected that it builds up air pressure, but trigger pull is not releasing air to fire pellet out of barrel. Does this sound accurate?

I believe that is my situation. Honestly, I did not have a pellet in when I attempted to fire the air rifle. I thought you could dry fire the rifle. Other use your assessment is as accurate as I think .

Thank you

 

[PapaT]

I believe that is my situation. Honestly, I did not have a pellet in when I attempted to fire the air rifle. I thought you could dry fire the rifle. Other use your assessment is as accurate as I think .

Thank you

Yes, a pump gun can be dry fired (my favorite way to trigger pull test).

I'm going to work through questions with you, and I'm sorry if they feel insulting as that is not my intention. I start with simple things and basic questions and go from there. Plus, added bonus of being able to help others in the future if same issue for them.

1) Are you cocking the gun before pumping?
2) When you pull the trigger, are you hearing anything within the action/gun?
3) Did you test fire the gun at all before the rebuild? If so, did it work then? (I understand you had and used the gun in the 50s, I am asking about just before install or order of replacement parts.)

 

[geosar]

Yes, a pump gun can be dry fired (my favorite way to trigger pull test).

I'm going to work through questions with you, and I'm sorry if they feel insulting as that is not my intention. I start with simple things and basic questions and go from there. Plus, added bonus of being able to help others in the future if same issue for them.

1) Are you cocking the gun before pumping?
2) When you pull the trigger, are you hearing anything within the action/gun?
3) Did you test fire the gun at all before the rebuild? If so, did it work then? (I understand you had and used the gun in the 50s, I am asking about just before install or order of replacement parts.)

1) I am beyond being insulted especially by anyone who knows more than me which is about everyone here.
2) There is not separate cocking mechanism. When the check valve mechanism is pumped the trigger keeps a release part in place, then when the trigger is pulled the check valve spring pushes a piece backwards to direct the air up through a couple of passages to eventually direct the pressurized air via the bolt to the pellet. Then the sear spring pushes the piece forward from the rear and it apparently is retained by one of the edges on the trigger. At least that is my rudimentary understanding from one of the few crosman 140/147 youtube videos.
3) I hear nothing when I pull the trigger which makes be think that I may have failed in my seal replacement effort.
4) This rifle has been in my collection since 1955 or so. When I pulled it from the dust bin it would not pressurize up on being pumped. It was a very reliable and accurate shooter in the 1950's but I have shamefully ignored it for too many years. I am in the process of purchasing brass instead of aluminum valve pieces. I have cleaned all of the firing pieces, ultrasonically , and installed all of the new o rings etc. with I feel adequate lubrication. The pump rod cup and fiber piece was installed professionally by JG Airguns who have been terrific.
Thank you, Papa T

George

 

[PapaT]

Sorry, I see now that it is a self-cocker lik3 my model 130. I should have thought about that at onset. I am not specifically familiar with this model, just a deep love of pumpers, so your ask got my interest. I haven't watched it yet, but you mentioned watching YT videos on it, so I would like tonassume you have watched the rebuild video by Nibs of Walnut and Steel?

I'm going to watch Nibs video/do some research, but teardown and careful rebuild again while checking parts is not a bad idea. Any photos you can take of assemblies would also be helpful.