Bumper on my ryobi straight shaft has worn and will not feed out cutting line can I get a new bumper

if worn need to replace it

Be sure the spring is not bound up with grass or mud. It has to recoil to push the head down so the line doesn't continue to shoot out.

Bumper heads are known to jam up. The line gets bound up inside the head, or the line becomes loose when there is not much line left. pull on the line to see if there is a lot of slack in it. Also look at the line with the cover off to see if the line is bound on itself.

Piston does not return to top is caused by bent driver, worn lower bumper missing check valve or worn piston oring. Remove the head and pull out the cylinder and driver. Check the driver for bent shaft and that the piston/oring fits snugly into cylinder; make adjustment as needed. The lower bumper should not be cracked or missing pieces. Below the bumper is a seal that should fit snugly around the driver blade. Most all nailers have a check valve around the outer lower part of the cylinder. Could be oring or look like rubber band. This checkvalve will fit snugly over a series of holes cut into cylinder and causes the piston to return to top (not all nailers have this checkvalve). Lube all parts with silicone paste lube or nailer oil. Good luck

Hitachi 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

Hitachi 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

Make sure that orings are in good shape, lower bumper not cracked, (no leaks and the driver/piston stays at the top position, if piston drops a little or all the way down with no nails in gun, replace piston oring). Also check spring tension for feeder and two check paws in the door (feeder tension should be firm ). Adjust the timing screw up or down one or two turns and test (timing screw at the top of safety foot, head of screw pushes on the firing valve ). Test for lower bumper cracked. Remove nails and leave side door open. Hold the nose of the gun against coiled air hose or thick rubber and press and hold the trigger. The piston will stay down against the bumper until you release the trigger. No air should leak out the driver path. If air leaks past driver suspect bad bumper. Test action of feeder piston. Remove side cover to feed piston and clean debris. With air disconnected, move the feed piston back and forward. There should be a little resistance, if it moves very easy, suspect orings worn. As soon as you connect the air line. the feed piston should move forward with force, note the position of the feeder. Now with air disconnected, place nails on the feeder. The first nail should be well within the path of the driver. If not fully under driver path suspect worn feeder / feeder retainer pin, or debris inside feed piston chamber preventing piston from full forward travel (debris from inside of the gun will enter the feed piston chamber usually broken bits of lower bumper). Replace parts as needed. Good luck with your repair.

The long bolt coming down at the end shaft like place reel over bolt then turn back and forth slowly while pushing upward and it should lock in and take knob or bolt at end and tighten to the right.

it may be simply but have u fed it on the right way

Go to www.managemyhome.com and download a free copy of the onwers manual.
Good luck!