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Without a serial number, can give only generalizations.
This model was made between 1971-1980
Starting in 1973, the year of manufacture can be determined by subtracting the first two digits of the serial number from 100
Example: SN 2512345 would have been made in 1975 [100 -25 = 75] and SN 94365295 would have been made in 2006 [ 100 - 94 = 06 (2006) ]
Prior to 1973 Marlin used a one or two character letter code at the beginning of the serial number.
The battery is no longer good. You will need to buy a new battery. Don't over charge your batteries. They all vary. Expensive cordless tools will come with a charger that shuts off automatic to prevent over charging. I own cheap Skill drills that has served me well. These batteries lasted over 11years. It makes no sense. They should not have lasted more than 5 yrs., even 2yrs. I make sure I never over charged them, but they should not last that long. Freaky. Your battery is dead forever, sorry. I have others just like yours waiting to be recycled.
If i have this striaght two chargers and the green and yellow lights are on and the batterys will not charge and there 14.4v batterys correct . Then the batterys must be no good unless bolth chargers are bad and have the same problem witch is exterimly unlikely. most likely the batterys and are NG.They don't do well if left in cold condutions or hot for that matter but cold is worse . 14.4 V is is an unasul size and if its not a lithuim ion battery its going to be obisilete and unavaible soon if not already . Ihad the same problem with my RYOBI 7.2 volt can't get the batterys for under a 100 dollars thats one and a speical order i paid 39 dollars for the gun and 2 batterys . They make the money off resale on batterys . And you can do far better then RYOBI for a screw gun now a days
If the nailer is an older gun, could be a product sold thru Grainger. If however the gun is new, could be from china and parts are most likely not found. Ebay is a good source for information on identifying the tool to a mfg.
No problem however. I would just make the gasket out of automotive gasket material. Most newer guns have a head gasket made of oring material and do a very good job of sealing. If you have a thick paper looking gasket, use sever layers of gasket material (not cork or rubber). Cut two or three pieces of gasket material larger than needed and staple them together to make thick gasket. Remove the head and oil the surface of the body of the gun. Cut hole in the gasket material to allow for cylinder to fit thru if needed and make an imprint on paper (you can also use the old gasket if complete) just punch out the bolt holes and small vent hole and alignment bars within gun for now, dont trim the outside of the gasket. After holes are punched (I use a leather punch), install the head and test the gun. If all ok, just trim off the access gasket with shape knife without taking the head off (I use an exacto knife). Good luck
The gun seems to be worth around 700-800$ in decent shape, so I'd say depends on the price for refinishing. Try to see if you can get an estimate.
If you're not planning on selling it, and keeping it in the family. I would recommend getting it in good condition and put in a nice case so it can stay good.
Can't be specific without model number, however, air leaking around nose area (where driver strikes nail) is indication of orings not sealing around cylinder spacer and body of gun and/or leaking at cylinder spacer and cylinder. Most likely grit has entered the gun and has begun to scratch metal and orings. Time for a reseal kit available thruDewalt service center (or if you are a tinker-er, remove head and pull cylinder, remove fine scratches on body of gun with fine sandpaper and lube with plenty of silicone lube paste ). Final note, air could be leaking between cylinder seal at top of cylinder and headvalve. Air leaking here would also come out of gun thru nose, but the driver would be pushed down cylinder with nails removed. If no scratches are found and orings appear to be in good shape, then suspect this seal. Dewalt used vinyl orings (gold colored) that do not last allowing leaks. The orings that come in their repair kits are also vinyl (not good). If possible replace bad orings with buna-n or viton from bearing house. Good luck
On a projection television you will have to replace all three(red,blue,green) projection guns in a matched set, the reason is if you replace just the green gun, your picture will be over saturated with green light making your picture look green,because the new gun will be alot brighter than the red and blue guns. With that said, repair will cost approx.$400+, I've heard up to$600. Good luck !