CROSMAN 140

A fair – good example of this pump-up rifle in .22 but it would not pump-up. This model is an early one with a simple ‘turn and pull back’ rotating breech sleeve as on the 1377 pistol
An exploded diagram is available from the Crosman site.

Strip:
Remove safety catch by turning it to the neutral position (just over half way) and push out. The safety catch plunger pops into the vacant hole but will not fall out.
Undo stock bolt on underside of stock and remove action from stock. Do not lose the washer for the stock bolt.
Remove the breech cover by removing the small bolt and sliding the breech cover off the barrel.
Look into the breech and note a screw bolt that secures the barrel to the cylinder. It can be a little awkward to undo this without removing the barrel end plug and loading probe but it can be done. I found it easiest to first release the barrel end bolt as: Undo and remove the bolt at the rearmost end of the barrel. Take care to support the barrel. Now push back the loading probe as far as it will go and use a small screwdriver to undo the screw visible inside the breech. It will not come all the way out because of the loading probe but it will undo enough to release the barrel. Simply pull barrel backwards to free from the muzzle support. When you remove the barrel, do not lose the transfer port seal that connects the cylinder to the barrel: a small ‘top hat and seal’. Put it somewhere safe.
If you need to remove the bolt/probe to fit a new O ring you must now remove a plastic insert that the barrel securing bolt passed through. To do this, I found it easiest to replace the bolt through the insert (from the top) then use a drift to gently tap the bolt up and away, taking the insert with it. The barrel end cap then comes free and the bolt can be slid out.
Remove the roll pin that secures the barrel / cylinder end cap at the muzzle. Remove end cap and pull the pump assembly free together with the pump handle. Take care not to lose the steel pin that connects the pump handle to the pump as it is quite loose.
You are now left with the main cylinder assembly containing the valve work complete with trigger assembly
Remove trigger assembly by removing the two screw bolts. Nothing will ‘ping’ away as the trigger is a self contained unit.
Using a suitable drift, tap out the pin at the breech end of the cylinder (the trigger assembly fitted over it), noting that the bottom end that the trigger fitted over is serrated. Tap it out from the top.
The hammer assembly can now be removed... in order, end plug, spring, spacer and a pin hammer through a sleeve. Note the spacer has a tapered end that faces the end plug.
The main valve assembly is held by the long bolt that secured the stock. There are no flats on this to help removal but it unscrews. I clamped it in a rubber faced vice and turned the cylinder to do this.
You can now push the valve assembly out of the cylinder, towards the muzzle. The main valve body comes out first followed by the blow-off exhaust valve assembly.
The main valve seals to the cylinder by an O ring. Replace if necessary. Ours was flat and hard so was replaced. The main valve is actually two halves: unscrew the parts. They seal by another O ring that is compressed between them. Replace if needed. Inside is the main valve spring and the valve head. I did not need to replace the valve head. Reassemble.
Turn now to the blow-off valve; brass about 1cm long that fits inside a metal sleeve. There is another O ring on this valve; replace if necessary. Now look inside this blow-off valve and note that there is an internal O ring (or quad seal) that seals the probe on the main valve assembly that slides within the blow-off valve. It is a bit fiddly to replace it but it may be necessary.
Once this is done that’s it ... all done and ready to rebuild.

Rebuild:
Assembly valve unit and slide into cylinder: steel sleeve with blow-off valve towards breech. Push into place; it cannot go too far. Make sure the transfer port to the blow off valve sleeve is uppermost.
Replace the stock securing bolt. It holds the main valve in place.
Replace the hammer assembly and tap the serrated pin into position.
Replace pump and pump handle assembly and the end cap.
Replace the transfer port seal and place barrel in position. Tighten barrel screw inside the breech. If you removed the bolt assembly, replace it now. Replace barrel securing bolt at the end of the action. Replace sliding breech cover onto bolt.
Replace trigger assembly.
Replace action in stock and replace safety catch.

Job done.
Cheers, Phil