Benjamin Repair 342, worth it

[Texstever]

Have a 342 picked some years ago and decided to look into repairing. Not holding air so likely would do a seal repair/replace. Question is the pump arm currently doesn’t stay closed. In other words it doesn’t rest inline with the stock. Will this resolve itself when the seals are replaced of is there another issue causing this?

 

[Duckfish]

Try an alcohol flush first, google it.

 

[Texstever]

Try an alcohol flush first, google it.

Is that for air rifle or me? Thanks

 

[Duckfish]

Is that for air rifle or me? Thanks

Yeah!!

 

[.20calguy]

Have a 342 picked some years ago and decided to look into repairing. Not holding air so likely would do a seal repair/replace. Question is the pump arm currently doesn’t stay closed. In other words it doesn’t rest inline with the stock. Will this resolve itself when the seals are replaced of is there another issue causing this?

Its a good idea to degrease and flush the valve first. I've used alcohol and cleaner degreaser. People squirt oil in them which holds dirt and debris defeating the valve seal, especially if left uncharged.

Determin what is leaking. There are three leak points.
The plunger (hiss while closing the pump arm). The check valve, (hiss from the pump area with the arm open)
The release valve, or valve washers (hiss from the breach)
A lot of guns only need the plunger replaced, and a flush can bring the valves back to life. Once it's working leave it with a charge when put away to keep the valves sealed.

 

[Sicumj]

There is a spring in the pump linkage that holds the lever shut. But there is another way and you should do this anyway for max efficiency.

Adjust pump cup so that it touches the bottom of the valve inlet with pump almost closed. Handle will cam over when closed and hold pump lever up in place. Don't over do the the lengthening of the stroke. You just want to kiss the valve inlet hole with lever almost closed, with just enough length to allow it to cam over and hold.

After the alcohol flush I like to use a mixture of Automatic Transmission Fluid 1/3rd and synthetic hydraulic 30 wt oil 2/3rds, This seems to lengthen the life of the seals in the gun.

 

[Sawney Bean]

Have a 342 picked some years ago and decided to look into repairing. Not holding air so likely would do a seal repair/replace. Question is the pump arm currently doesn’t stay closed. In other words it doesn’t rest inline with the stock. Will this resolve itself when the seals are replaced of is there another issue causing this?

I'd definitely fix it. They're nice shooting guns. With the iron sights they make for a good camping/truck gun.