Sounds like the drive gear is not engaging the blades.
Photo is of a generic set up for most trimmers.
If the 2 blades are not tightly sandwiched around the drive gear labelled "1" then the blades will not move.
Check to see that the screws are tight on the underhousing plate. You may have to take the plate off to troubleshoot further
SOURCE: Black and Decker 16 in Hedge Trimmer
I use a dremel with a sharpening stone, if u don't have one you can also use a power drill with a small sanding disk (1 inch) and course sand paper (30 or 40 grit). or you can use a bastard file. its too tight to use any kind of angle guide so just take your time and do it by eye. it shouldn't take much to get them sharp enough to do the job, over-sharpening is unnecessary and dangerous, and will make the blades dull faster. sharpen all the free blades, top and bottom, then start the trimmers to advance the blades to free up the sides you couldn't get. i use a light penetrating oil to clean the blades first, then lithium grease spray to lubricate.
SOURCE: reassembling blades on hedge trimmer
the blades are stuck , i spray my trimmer with wd40 before every use to keep them juicy you should too. also sometimes if you hit a large stick it will put a divot in the blade cause ing it to stick. as for putting it together, find some one who can do it without directions. but when you use them next make sure you soak em good with wd40 or something if you dont i guarantee they will always stick. wd40 willl not hurt any shrubbery, as ive been doing it for years.
SOURCE: Ryobi 18V Hedge Trimmer Blade Question
Just buy a file and push 3 or 4 down strokes down the same slope of the cutter toward the sharp edge. Never file on the flat top of the cutter, only on the slope. Support the frame using a saw horse or pick-up bed. The support makes the file cut the metal better. You can do the same thing with chain saws. You just need the file that fits the cutter. You just hold a consistant angle and count out the same number of strokes. Also, clean out junk between the moving parts, tighten any loose screws, and drop a few drops of 3 in 1 oil between the moving parts. Having things sharpened at a shop is inconvenient and expensive.
SOURCE: My B & D electric hedge trimmer blades are frozen
spray liberally with wd40, let side and hour spray rag with wd40 and clean blades and look for any bent teeth in blade that maybe binding them as u clean use pliers and screwdriver to move if any found, it is likely that wither sap dried or rust formed and is creating too much friction for blades to move wd40 will help free up blades
SOURCE: One year old Ryobi s430 4 stroke trimmer will not start.
Check the fuel lines for cracks/breaks. If they are o.k., then:
Youwill
need to disassemble the carburetor and spray with carb.cleaner.Make
sure the small screen is free of debris. (Should be able to seedaylight
through it.)
Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals can become blocked. Reassemble and start.
If the carb. parts are more than 4 years old, you may have to replace them.
If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement
Just let me know.
Jim
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