How to sharpen blades on a Yard Machine 6.5 chipper
I bought this chipper shredder used and it won't chip branches. I assume the blades are dull and need sharpening. I have no manual so not sure where to start without disassembling the entire unit.
First, disconnect the spark plug wire. Next, remove the feed chute. Now you can rotate the chipper flywheel by hand, (clockwise) and access the blade holders. The blades are held on with Allen screws and the can be hard to get off. A heat gun or propane torch may help. Once you get the blade off I recommend you take them to a pro these blades need to be balanced to each other. When you reassemble the blades to the flywheel be sure to use Locktight or others thread locking compound.First, disconnect the spark plug wire. Next, remove the feed chute. Now you can rotate the chipper flywheel by hand, (clockwise) and access the blade holders. The blades are held on with Allen screws and the can be hard to get off. A heat gun or propane torch may help. Once you get the blade off I recommend you take them to a pro these blades need to be balanced to each other. When you reassemble the blades to the flywheel be sure to use Locktight or others thread locking compound.
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Go to www.ordertree.com. The flailblade is p/n 719-0329, The shredder blade is p/n 942-0571, The chipper blade is p/n 981-0490. Replace them you have to take casing off the unit to get to them.
The blade(s) should have usually two bolts on them depending how many
blades you have. Mine only has one blade held on with two bolts and
that is only on the side that cuts the larger branches up to two inches
in diameter and should be sharpened on a grinding wheel because it has
a specific angle to it. The other side that chips smaller branches and
twigs it a type of flailer, meaning pieces of metal just swinging
around to mash up the sticks and do not need sharpening.
The blade(s) should have usually two bolts on them depending how many blades you have. Mine only has one blade held on with two bolts and that is only on the side that cuts the larger branches up to two inches in diameter and should be sharpened on a grinding wheel because it has a specific angle to it. The other side that chips smaller branches and twigs it a type of flailer, meaning pieces of metal just swinging around to mash up the sticks and do not need sharpening.
Maintenance (excluding the power plant) Your primary maintenance concern with chippers and shredders is their knives. You can re-sharpen chipper knives, whereas you can reverse shredder flail-type knives when dull but you can not re-sharpen them.
You must sharpen chipper knives with special sharpening equipment because they are made of high-carbon steel. Maintaining sharp knives can lengthen their life and the life of the machine by keeping power requirements low. An over-dulled or chipped chipper knife will need extensive sharpening, which will remove a large portion of the blade. This obviously will shorten its life. As soon as a blade is slightly dull, you should sharpen it to minimize the amount of blade-material that you remove. All knives need sharpening at the same time to keep them in balance-even if only one is worn or chipped. Also, you must use matched sets to keep the knife the same distance from the anvil for proper chipping and feeding. After removing the knives, clean the area where they are fastened with a wire brush to make sure they will align correctly. Be sure to torque the knife bolts to their proper specifications. You will need to examine the anvil and be sure it maintains a good, square edge. Occasionally, you may need to remove and sharpen it.
Great input tina783. I have just one thing to add. Try to shred the branches within a reasonable amount of time. I found out that with my shredder, if I put older, dried up branches in, it tends to take a lot more time, as well as tosses chips back out at you. With newly cut branches, this wasn't nearly as much as an issue.
First, disconnect the spark plug wire. Next, remove the feed chute. Now you can rotate the chipper flywheel by hand, (clockwise) and access the blade holders. The blades are held on with Allen screws and the can be hard to get off. A heat gun or propane torch may help. Once you get the blade off I recommend you take them to a pro these blades need to be balanced to each other. When you reassemble the blades to the flywheel be sure to use Locktight or others thread locking compound.
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