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You do not say which size cutting deck you have. I will be writing about the 48", 3 blade cutting deck
The belt on this deck is self tensioned. The tension is provided by a spring attached to a moveable pulley on the deck. When the belt is in place you can manually force this pulley forward/backward and it will release the tension.
If the belt is off track, place the belt back around all the pulleys in the correct path, lastly force this spring loaded pulley forward/backward (depending on your deck, the direction is not important, the tension is) to get the belt around the pulley. If the belt is placed correctly, when you release the spring loaded pulley it will properly tension the belt.
Typically, these belts should not be jumping off. If yours is coming off frequently the belt may be worn. When they wear they get quite a bit longer, then the tension pulley cannot apply the correct tension. Rarely does the tension spring have to be replaced.
The other problem that causes belt jumping is worn spindles and stationary pulleys. The spindles are the most likely to need replacement. You can buy excellent replacements for JD spindles on Amazon for very reasonable prices. The following spindles are super replacement spindles for the 48" deck. They may very well be the same for smaller and larger decks; I have not researched that. Just search Amazon for Silver Streak # 285851.
Silver Streak # 285851 Spindle Assembly for JOHN DEERE GY21098, JOHN DEERE GY20962,
Product description:
Spindle Assembly / John Deere GY21098 Pack Size:1 JOHN DEERE GY21098, JOHN DEERE GY20962, JOHN DEERE GY20867, JOHN DEERE GY20454 OREGON 82-359, ROTARY 12910, ROTARY 11964 JOHN DEERE D100, D110, D130, D140,D150,D160, LA100, LA105, LA110, LA115, LA120, LA125, LA130,LA135, LA140, LA145, LA155, LA165, X110, X120, X140 Includes grease Zerk, pulley lock nut, blade lock nut, and washer , Height: 7 ", OD: 5 "
You can also find replacements for the flat pulleys on Amazon. If you cannot find what you need there, go to http://www.greenpartstore.com//
The rn46 nailer has two retaining rings for the feeder. The snap ring on the very back of the feeder assembly is removed with snap ring pliers or two small pointed tools of your choice. The rear cap will come off with spring pressure so be ready to catch the pieces. You need to remove the nail canister to see the rear snap ring. The feeder pin holding the feeder onto the feeder shaft is just a rubber ring that can be removed by prying behind with flat blade screwdriver. Caution when you remove the feed-pin and move the feeder or you will lose the feed-sping under the feeder , Good luck
Usually miss feed happens when the driver does not return to top position not allowing the nails to feed into position. Easy to check, point nose of nailer up then down again to see if the driver is loose in the cylinder. If loose, the driver will be in the down position when the side door is opened. If driver is down, replace driver oring. If driver oring is good, look for spring tension on feeder and check feeder spring on the door side. If piston oring good and feeders have good spring tension, suspect lower bumper cracked(remove head and piston to check bumper).
On gun with depressor (safty foot) not actuating trigger, look for worn trigger (trigger inner lever could be worn) or loose or worn firing pin in the trigger valve above the trigger(valve # tva6). Replace as needed. To check for proper gun action, remove the nails, remove the 3mm roll pin holding trigger and dry fire the gun by depressing the tigger pin. 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
Most wipers are replaced with the entire blade and holder assembly, and many no longer facilitate blade itself replacement. It is worth it, as the arm and spring wear, over time.
The entire blade and holder easily separate from the arm and the new one clicks right in.
Skipping could be caused by various issues including, worn piston oring, cracked lower bumper, weak or missing feed spring, weak or broken spring behind feed piston, or weak/ missing check spring on door. Easy tests. Open door and remove nails, point gun up then down again to check for loose piston. If piston moves up and down, replace oring and examine lower bumper for missing pieces. Piston should stay at the top of cylinder. Make sure that there is spring tension on feeder and on check feeder on the door. Dry fire the gun rapidly against rubber pad or coiled rubber hose. With door open notice that feeder is moving back and fourth just as rapidly as the driver/piston is moving. If it appears to move slower than piston moves or in slow motion, replace feedpiston spring and oring. If feeder moves just as rapid as driver, remove air hose and push feeder back by hand. It should take a great deal of pressure to move feeder all the way back. If spring feels very strong replace oring to feed piston and make sure that the air pathway to feed piston is clear. Good luck
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