How many pumps...

[triggerfest]

...before the pump mechanism of a 13xx will fall apart ?  With basic maintenance of the moving pump parts, like a simple lube ?

Or am I overthinking this ?

[Back_Roads]

 I would speculate with proper maintenance a million

[StockClassDD68]

I oil my 1322s before each use on the linkage points. The pump cup or o-ring for a ftp I oil about every 200 pellets or so. Depends also on the type of shooting I'm doing, target shooting and low pumps, I let it go a bit more, pesting or hunting with 12-15 pumps I oil a bit more.

And dirt is the enemy with the open pump slot, that will score a tube very quickly.

[triggerfest]

I would speculate with proper maintenance a million

Suppose the max 10 pumps per shot, that means 100.000 shots or an equivalent of 200 tins of 500 pellets in case of a 1377.

Ok, that is quite impressive for an entry level airgun 

[anti-squirrel]

Lots.

My 1377 was used to eradicate a flock of HOSPs by my sister's husband a few years ago.  He used 2+ brown-boxes of pellets; by his count "more than a thousand" and he said he used 5 to 10 pumps depending on distance.  And he did zero maintenance.  I ran it over the chrono a few weeks ago and power was still spot on where it was when I bought it.

My Medalist rear-cocker (a nicer 1322) was purchased sometime in the 80s and was a primary pesting tool for the previous owner for a couple decades in his barn; I've put about 30 tins of RWS wadcutters through it and maybe another 15 tins of whatever in .22 (it also loves Polymags) and it usually get 8 pumps per shot.  It gets a drop of oil every few months.

And don't even ask how many BBs (former life) and pellets my current 760/Mk4-177 hybrid has seen.  Kajillions?  Fluptillions?  It's an old 760 that had a worn and rusty rifled barrel and now wears a MK4-177 barrel.  Accurate as heck and featherweight play gun... but it will knock the bejesus out of some pine cones and definitely deserves a scope.

[maraudinglizard]

I have a 40 year old rear cocker 1377 that still has the original pump arm mechanism. The internals and breech has been upgraded and the rest is original. As for pumps, probably over 200,000 give or take in its lifetime. I bought the gun brand new in K-mart in 1983.

[Bentong]

Best for your pump arm is to replace the drift roll pin with a solid pin. The drift roll pin is not called drift pin if it does not drift out and give the pump arm to wiggle loose. I have 2 1377 one 10 yrs old and 4 yrs old and no problem as of yet..both have FTP for ease of pumping and power.

[Mzq284]

How many? All of them.

Are you overthinking it? YES, why are you wasting time on this when you should be shooting? Come to think of it, I should be shooting instead of replying.