My max cn 450r roofing nailer wont feed the nails up.driver is driving nail when nail is in position.cant seem to keep the coil nail feeding yet everything seems to be working.what shoud i do.than clay smith
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Re: max roofing nailer
Max nailers are very good quality and parts are not expensive. Parts and parts list at www.toolpartsdirect.com. Check the following to repair not feeding problem.
Check paw in the door should have a light spring action. Feed paw should have a medium spring action. You may have to pull the feed piston back and hold to check feed paw spring action. Feed piston should have heavy spring action. If springs seem ok then remove feed piston and replace two orings. If the feed piston spring is broken replace with correct part. Make sure that the ports that direct air to feed piston are not blocked with bits of rubber or dirt. Sometimes parts of the bumper will break off and spread thru-out the gun. Good Luck and enjoy. (parts not expensive)
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Try ez test to check for proper operation. Remove nails and air supply, point nose of gun up then down again. The driver should not move from the top of cylinder position. If driver is moving up then down replace the driver oring. If driver oring seems ok then connect air supply and bump fire the nailer without nails against soft wood and door open so that you can see the driver and feeder moving. Bump fire the gun and make sure that the driver is moving all the way back up to top of cylinder and the feeder is moving rapidly back and forward. If movement seems ok then hold the nose down on soft wood and depress and hold the trigger. This will fire the gun but driver will stay at the bottom position and not return until you release the trigger or lift the gun. When holding the gun with the driver down position, no air should leak out the top or bottom of the gun. If air leaks out bottom, replace lower bumper, if air leaks out the top replace the upper bumper. Good luck
I have noticed that some if not all brands are now using metal wire instead of copper to make coils. Metal wire is stiffer and does not bent down out of the path of the driver. If you are using coils welded together with metal wire (some wire looks copper collored, however when tested with magnet is found to be metal), and after firing a few nails, open side door and check if the leading wire is not bending down. Leading wire will not allow the nail the fully move into the path of the driver. Stiff wire will also cause the next nail in line to pull down slightly. When nail is pulled down slightly, it will be out of the path of the driver. The driver will hit the edge of the nail and cause it to flip. The nails can also flip if the feeder is not pushing the nails fully forward due to low pressure or weak spring or springs (some nailers have a spring pushing feed piston others use air). Finally, the feed piston or the body of the nailer where the feed piston is housed could be worn. With feed piston in forward position (normal) and the feeder claw removed, apply outword pressure to feeder with thumb checking for loose fit. The feeder shaft should not be loose nor move from side to side with thumb pressure. If shaft is loose then most likey lower body of gun worn with no repair. Good luck with you nailer.
Nailers that use strips of nails (one nail directly behind the other) will sometimes drive two nails at once and is caused by damage to the driver. The nails are so close together that the driver will hit the first and part of the second nail head. Coil nailers, as your an451, use nails seperated by welded wire making it very difficult the the driver to hit the second nail. Usually when a coil nailer shoots two nails, it is acutally the trigger valve that acutates twice (two very rapid fires). Two very rapid fires is caused by faulty trigger valve. I have seen a roofing coil nailer fire one nail and a second nail drops out of the gun. Caused by weak / malfunction of nail feeder or wire used to weld nails together is too thick.
coil roofing nailer will skip nails if the piston oring is worn, the
feed spring is weak or lower bumper is cracked. Easy to check. Remove
nails and air supply. With side door open point nose of gun up then down
again. If the piston moves up and down in the cylinder, replace the
piston oring. If piston does not move and is in the up position, check
the feed spring for tension. With air supply removed and door open,
slide feeder back and press on feeder from door side to check tension.
It should spring back to position against rails.If is feels loose,
replace spring and retainer pin if the pin is worn. If piston oring is
good, and the feeder has good spring tension, suspect lower bumper and
the plastic part below the bumper called the "sheet". Remove head and
pull the cylinder to examine lower bumper. Parts are available at
www.toolpartsdirect.com. Good luck with your repair
It's quite possible that the areas through which the nails move in the tool need to be cleaned and or lubricated with light oil such as WD40. Rust or dirt from nails can build up on surfaces in the unit. Check your manual for details.
The feeder will dislodge if the feed paw spring is weak or missing. Replace with new spring to keep the feeder paw in place. Visual test with good feed spring. Remove nails and open side door. Fire gun rapidly against hard rubber or coiled air hose. The feeder should move back and fourth in time with the piston/driver. If the feeder seems to move in slow motion compared to the driver, check feeder piston orings and feeder piston spring. If both feeder piston orings and spring are in good condition, then check air passage to feeder piston chamber for obstruction. Sometimes debris will lodge in white oring where body mates to nose of gun. Good luck
if u are right nails for gun,then make sure when u put coil in and feed in front of firing pin the nails are straight with pin and connecting wires are not bent causing nails to fall out of alingnment.
Your nailer shares design features with Milwaukee and Ridgid. All three brands experience the same issue. Lets go thru a series of simple tests to determine the problem. First and most simple test, manually load the nails and fire the gun untillmiss-fire. Upon mis-fire disconnect air, open latch and check if the driver is all the way up into the cylinder or is partially down blocking next nail. If driver is down blocking next nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this time holding the gun down and keeping the trigger depressed. In this position, the driver will remain down and feeder will remain retracted. With feeder retracted and screwdriver in hand carefully check the spring tension on the feeder (should be rather firm tension on spring and the feeder must retract with good force). If no tension or weak, replace feed spring. When you finally release the trigger, the driver will retract and the feeder should return with good force. If feeder does not return with force, replace orings and spring behind feed piston. If all tests are ok, remove head, check lower bumper in gun for cracks or missing pieces. Replace as necessary. Lube all orings with silicone lube available at Lowes in the plumbing department. (Danco brand) Good luck on your repair and email your questions.