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I had a similar problem, with a headg trimmer, it was working fine, just stoped. It did not get stuck, or caught up in anything, on dismantiling, as you say, motor running, no drive.
It was get a new one, or bust, so I put a small tack of weld on gear/drive and reduced fuse rating to 8 amps, (from 13 A) incase I got it jamed, its fine now.
I never could figure how the drive got from a gear to the oscillating leaver, must have been a clutch somwhere inside, anyway, weld sorted that out....
The frequent use of powered hedge trimmers poses the risk of the blades becomingjammed (and it is highly likely that this will happen to your model at least ...
? 3:15
https://www.youtube.com/watch?v=aMddbl9B0iE
Jul 23, 2011 - Uploaded by Joby F. Randrup
Ever had a hedge trimmer break because you hit a fence or something ... HEDGE TRIMMER REPAIR "how to sharpen hedge trimmer blades" ...
proper method is to use what is referred to as a "lapping table" professional sharpening shops have these , look in your yellow pages for scissor sharpening , but if your a skilled hand and have some time then a simple fine file will work as well , keep same angles on cutting edges ,approx. 30 degree angle
Without direct exposure to this model, check the parts catalog, there is more than likely some type of coupler between the engine and blade assembly. Usually they are added for exactly this situation. Worse case senerio, the gearbox for the blades is "toast".
look carefully along the teeth of the cutter blades and see if one tooth has not jumped over the opposite tooth thereby locking the blades together
a bent up edge will do the same effect
you can remove the cutter bar and then the cutter bar cams then run the motor
if it still hums , junk it
The likely issue is the gear pin has been sheared. The part is no longer available from Craftsman. (P/N from sears: 616255-001)
I had a similar issue with a similar electric trimmer. I removed the old pin and used a split pin and ground it down to the proper size. It's now worked for about 2 years just fine. This requires complete dis-assembly.
Hey i found this for you i might help. Click on the link at the bottom!!
How to Sharpen a Black and Decker Hedge Hog
Maintaining the sharpness of electric timmers can made landscape trimming easier with beautiful results.
Electric hedge trimmers make trimming hedges and bushes easier
and quicker than using manual hand-powered trimmers. Electric trimmers,
the most popular type in the U.S., cost less and require less
maintenance than gasoline-powered models. Electric trimmers are used
most often by homeowners with the Black and Decker Hedge Hog series
being very popular. While they are not premium products, electric
trimmers like the Black and Decker Hedge Hog trimmer can keep trimming
reliably for years with proper maintenance, including sharpening the
blade's teeth. Difficulty:
Moderately Easy
InstructionsThings You'll Need
Work table
Two medium size clamps
Dremel tool or similar hand-held multi-purpose tool
Grinding wheel attachment for hand-held tool.
Dremel 971 (or similar) aluminum oxide
grinding sharpening stone with a tip small enough to cover the flat
facet of a Hedge Hog blade tooth
1
Unplug the electric trimmer before trying to sharpen the teeth.
2
Clamp the electric trimmer to the work table using two clamps if
necessary so the Hedge Hog is firmly held down with the blade teeth
accessible over the edge of the work table.
3
Insert and secure grinding tip in hand-held multi-purpose tool.
4
Maneuver the grinding tip so it is perpendicular to the facet of the Hedge Hog tooth.
5
Sharpen teeth in one direction, being careful to try and maintain the
same cutting edge angle on the sharpened tooth of no less than 35
degrees.
6
Make same number of grinding passes/grind the same length of time a few seconds on each tooth.
Tips & Warnings
This task should take about 15 minutes.
Keep a light touch; too much force can break the grinding surface.
For best results, insert the sharpening bit slightly less than all the way into the tool.
You may have a piece of metal between the moving blade and the stationary one. Also the motor may have been at the top of the stroke when it stopped. You may be able to "force" the blade to move a little. This may free it enough to work.
I had this problem with mine. I ended up disassembling the two halves of the trimmer, then reseating the cam. The cam was jammed when I caught the blades on a chain link fence. Good luck and patience.
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