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Craftsman MODEL 316.791890 2-CYCLE GAS TRIMMER Clutch fail


simplegreen99's Avatar
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Join Date: Aug 2008
Posts: 5

07-07-15, 10:59 AM   #1  
Craftsman MODEL 316.791890 2-CYCLE GAS TRIMMER Clutch fail

Afternoon all, hopefully i can get some insight. I've replaced the clutch (part no 791-182369) on my trimmer twice now after my initial failure (so its failed 3 times). Im using a cutting head that allows me to thread two individual .130 trimmer line. I really doubt its an off balance issue thats causing the clutch to fail at one of the springs on the clutch. I think its a matter of me not installing it correctly. I put everything where it needs to go based on the repair schematics. Including washers etc. Then i slide the Clutch drum over 791-153592 but some how the clutch always works its way out from under the drum and as the trimmer speeds up to start to cut the clutch makes its way between the flywheel and the drum thats when one of the springs will usually fail (centrifugal force?) and everything comes to a halt. So a few questions. 1) is it possible im missing a detail that needs to be done during install? Example i just slide the drum assembly on i dont tap it into place its always harder to get back off once the failure so maybe it is supposed to be tapped into place so the clutch cant make its way out from under it? 2) Is it possible that something else in the system could be causing clutch failures? Im including a link to a picture of the failure. Not sure of the rules of the forum but hopefully it will help. The clutch stuck under the drum against the flywheel http://1drv.ms/1LIrClN The clutch after i pull it off http://1drv.ms/1LIrym3 Thanks in advance!

 
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geogrubb's Avatar
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07-07-15, 12:41 PM   #2  
On a lot of trimmers there is a screw that holds the clutch drum on, usually people have a problem getting them off instead of staying on because they don't know its there. Look in the end of the crankshaft to see if there is a threaded hole there, on most it is a slotted screw or torxT20, maybe the head on yours has broken off. Have a good one. Geo

 
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07-07-15, 06:55 PM   #3  
I'll give that a look. Doesnt show one on the manual but i'll check

 
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07-07-15, 07:05 PM   #4  
Nope, no screw, it sort of locks itself in place over the shaft of the engine

Craftsman String Trimmer Clutch 791-153592 Order now for same day shipping. 365 day return policy. RepairClinic.com

Parts 15,16,17 and 18

(large photo) http://c.searspartsdirect.com/lis_pn...5004-00001.png

[ATTACH=CONFIG]52916[/ATTACH]

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07-07-15, 07:44 PM   #5  
Per the model number the unit is made by MTD maybe you can find some info at their site. Have a good one. Geo

 
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