At least 2 times but NEVER more that 10 times, or you may damage the seals. Also you can find the owners manual on the crosman home page, see the related link.
The Crosman Owners Manual states to NEVER pump the pistol more than 10 time and at least 2 times to fire a BB out of the barrel.
The Benjamin or Sheridan pump rifle should never be pumped more than 8 times. See the link below for the owners manual (Crosman owns Benjamin and Sheridan air rifles)
PSI: It depends on how many times you pump the forearm. But Crosman says to never pump it more than 10 times. The 760 is rated at 625 FPS with a BB and 600 FPS with a pellet.
Crosman sells parts for the 1377. contact Crosman customer service. see the link below.
Crosman offers a service to locate repair shops that repair older Crosman air rifles. See the link below
Crosman did not make BB guns until 1947, so there is no 1924 model BB pistol. Crosman did make their first BB rifle called the 1923 model. It had a plunger under the barrel to pump up the gun. Benjamin had been using this design on their pistols starting in 1935 but crosman never used it on a pistol only on the first model. Now back to the Crosman rifles, the second Crosman rifle was the 1924 model and it used a pump handle under the barrel to pump up the gun. Yes I have a photo of a Crosman 1924 model but "Answers" has no way of displaying photos, so sorry your out of luck. FYI: Crosman is spelled with one "s" not two. CROSMAN
Crosman offers a free service to locate shops that repair older Crosman air rifles. See the link below.
The Crosman Bullseye Target model 105 is a pump pistol made between 1947-52
I suggest you direct this question directly to Crosman Customer service. See the link below.
First of all never use regular oil like 3 in 1 or any other product. Only use Crosman pellgun oil, RWS oil or Gamo oil. The other oils have petroleum products in them an will ruin the o-rings over time. Oil the moving joints. anywhere you have metal rubbing against metal.
No they are Smoothboar.
A person can make the pump easier to operate on a Crosman 760 air rifle by applying oil to the seals. This will provide lubrication and improve the overall action of the weapon.