Handle used to shoot staple gun no longer working, like something broke

Well I am gonna need a little bit information. I am assuming this is a air stapler? But if your gun fits the staples in the chamber the size shouldn't be an issue and fits the gun. What it sounds is that you are requiring oil. Most gun issues staples or nail is usually solved with proper lubrication. Few drops in the nipple and a oil wipe down on the nailer head. Compressors push wet air through the gun and will cause issues. So always start with oil and work back.

It's quite possibly under the cap it's the head valve. Does it shoot at all ?
If so hold the trigger after the shot listen for where air is leaking.

Sounds like you have a damaged or bent staple stuck at the business end' of the machine.

The staples load on the underside of the stapler.
Step 1 Push down and retract the stapler pushup mechanism.
Step 2 Position the stapler so that the moving hammer handle is down
and the staple exit is up
Step 3 Load the staples into the chamber on the bottom with the points up.
Step 4 Push the pushup mechanism into the locked position until it latches, you will feel the spring resistance as the staples are pushed into place.

Inside the cap, there's a plastic circular insert. It's a common mistake to reassemble the gun with this cap spacer upside down, resulting in the top of the cylinder not sealing in the air that returns the piston. Simply undo the cap, turn the spacer over and screw it back on again. Done.

It took me and my boss wrestling with this mongo stapler for 15 minutes to figure it out! :0)

To open the front end, pull up on the handle while simultaneously pushing down on the small black lever on the front. This takes some firmness and be warned, if it's jammed with staples it's going to take some serious force to get it open - watch your fingers!!! I strongly suggest the minute you get a jam, open up the front and clear it. Don't continue to staple in hopes it will work or clear itself or you will have a build up of jammed staples making it almost impossible to open and clear. Also note that when you open up the front end the staples tend to shoot out so be careful.

To open the back end to load staples, push forward and up.

Hope this is of help :0)

Make sure the staples you are using are compatable with your gun they should be type 53 or JT21 staples and they are not longer tham the gun is capable of taking I think the maximum capacity for this gun is 5/16 or 8mm.
Turn the gun upside down and pull back the carriage, the staples are laid in the empty chamber in the gun itself not on the carriage points facing in the direction they fire ie points facing you .
Push back the carriage this should slide over the strip of staples until the carriage clicks shut.
You should now be ready to fire, try and keep pressure down on the gun as the recoil can make the gun bounce and you will leave the staples proud.
Hope this helps.

Hi,
I can e-mail you schematics. I have all Fasco & Rainco parts for this tool and more in stock!

There may be a staple or a piece of a staple jambed in the driver. Sometime taking a screw driver and carefully pushing the drive back will clear the problem.

Know the types of staple guns available. They can be manual, electric, battery operated or run by compressed air with an air compressor. Some staple guns have guide wires because they’re used by electricians that can’t pierce wires. Others have long noses to work well in corners and tight spaces. There’s also a reverse built ergonomic staple gun called a "forward action" because the handle and the staple’s exit point are on the same end of the staple gun. Some staple guns can shoot brads instead of staples. Know how each type of staple gun works. This one is so simple because it works just like a stapler. You press and hold the silver latch on the back of the stapler to open the body. Take the tray out and fill it with staples. Then it’s ready to use. Just put the staple ejecting end on your piece to be stapled and squeeze it. There is also the forward action manual gun which is used by pushing the handle down, too. The handle is just located near the staple ejection site. Use an electric staple gun for effortless stapling. There’s no need to squeeze or apply any pressure on these guns. They come with a very short cord so you will always need to have an extension cord with your staple gun. You can also go with a rechargeable battery operated cordless staple gun. They are great but they do run out of steam so for long use one with a cord is better. They’re also pretty easy on the wallet these days, so there’s no reason to go without this in your home tool kit as it’s something that does a lot of jobs. Know the versatility of the staple gun. Whether you have a manual or an electric model, these are some of the most versatile tools out there. You can use them to recover furniture, to build a birdhouse, to staple lattice to a patio, to build lightweight projects like a small knick knack shelf and to do wiring work.