Replacement of Cutting Line! How to do? anneodello

This is the parts list but many of the parts are obsolete. you may have to source rubber or PVC hose of the correct diameter.

https://www.searspartsdirect.com/model/3ci10snelr-003386/lehr-st025dc-gas-line-trimmer-parts?page=3

You could try Jack

https://www.jackssmallengines.com/

..

There are lots of web sites on the internet which are offering information relating to cycle weed eater . All these are specially made for folks that are interested in finding quality information concerning cycle weed eater . For more information please see this website:http://www.4cycleweedeater.com/

will assume electric
fixable

would say bearing at the cutter head dry or worn out
when you turn the head to edger the load on that bearing is different

if noise is up in the motor same thing .. bearings

change the fuel lines over on the carby
you are trying to feed fuel through the primer line when the engine is running and that is why it is cutting out

Here is the info from the manual, the replacement line is put in near the center of the spool on the top of it, you simply feed it in. I have included a link to the manual so you can see the pictures. Look at page 10 for these instructions.
http://www.weedeater.com/ddoc/WEEO/WEEO2009_USen/WEEO2009_USen_TE475-952711797_545186833.pdf
LINE REPLACEMENT Pre--wound spools offer the most convenient method for replacing line and ensuring optimum performance. S Replacement spools are color--coded to ensure use of the correct spool with your unit. Be sure to use the same color spool as the existing spool. NOTE: Always clear dirt and debris from cutting head components when performing any type of maintenance. S Hold spool and unscrew cap by turning in the direction shown on top of the cap. S Remove line guide ring and spool. NOTE:When removing and/or installing spool, ensure dust cup remains installed over shaft. Use a pre--wound spool or refill spool with line. If using a pre--wound spool, remove tape strip from line and spool. REFILLING THE SPOOL WITH LINE WARNING: Use only 0.080" (2 mm) diameter round line. Other sizes and shapes of line will not advance properly and will result in improper cutting head function or can cause serious injury. Do not use other materials such as wire, string, rope, etc. Wire can break off during cutting and become a dangerous missile that can cause serious injury. 1. Cut a length of 25 feet of 0.080" (2 mm) diameter round WEED EATER brand line. Feed line in direction shown on spool. Spool 2. Insert one end of line into center cavity of empty spool. Ensure line will feed into spool in the direction shown on the spool (counterclockwise). 3. Continue feeding line into spool, leaving 4 -- 6 inches (10 -- 15 cm) unwound from center of spoo

Here is the info from the manual, the replacement line is put in near the center of the spool on the top of it, you simply feed it in. I have included a link to the manual so you can see the pictures. Look at page 10 for these instructions.
http://www.weedeater.com/ddoc/WEEO/WEEO2009_USen/WEEO2009_USen_TE475-952711797_545186833.pdf
LINE REPLACEMENT Pre--wound spools offer the most convenient method for replacing line and ensuring optimum performance. S Replacement spools are color--coded to ensure use of the correct spool with your unit. Be sure to use the same color spool as the existing spool. NOTE: Always clear dirt and debris from cutting head components when performing any type of maintenance. S Hold spool and unscrew cap by turning in the direction shown on top of the cap. S Remove line guide ring and spool. NOTE:When removing and/or installing spool, ensure dust cup remains installed over shaft. Use a pre--wound spool or refill spool with line. If using a pre--wound spool, remove tape strip from line and spool. REFILLING THE SPOOL WITH LINE WARNING: Use only 0.080" (2 mm) diameter round line. Other sizes and shapes of line will not advance properly and will result in improper cutting head function or can cause serious injury. Do not use other materials such as wire, string, rope, etc. Wire can break off during cutting and become a dangerous missile that can cause serious injury. 1. Cut a length of 25 feet of 0.080" (2 mm) diameter round WEED EATER brand line. Feed line in direction shown on spool. Spool 2. Insert one end of line into center cavity of empty spool. Ensure line will feed into spool in the direction shown on the spool (counterclockwise). 3. Continue feeding line into spool, leaving 4 -- 6 inches (10 -- 15 cm) unwound from center of spool

You can download one online at... http://www.poulanpro.com/poulanpro/indexAction.do?id=default Scroll down the right side to 'Download Manuals'...then enter your model #.. you can then download the owners manual or parts manual. Dwain

troy built is pure trash ill never waste money on any of thier trash agin i have a weed eater 5 months old it wont even crank pure china trash

the standard line length is around 3-4". you can leave it as long as you want, provided it does not bog the engine down, or bog down when cutting plants.

however plastic line breakage is typical of older line. it gets very brittle. Also typical of hitting rocks, gravel, cement, asphault, ground, etc.

I have one of this trimmers. It is simple to replace the line. 
-First line up the arrows on the bottom of the spindle. 
-Then feed the line back in one of the holes in the side of the spindle (this is the same hole that the cutting string comes out of). 
-You will see the line come out of the bottom of the spindle. 
-Take that line a place it in the hole on the bottom of the spindle. 
-Leave about 9 feet of string hanging out of the weed eater (do the same with the other side). 
-Then turn the inside wheel (I can't remember if it is clock wise or counter clock-wise but it will only turn one way) most of the string is rolled into the spindle. 
-Cut the string of about 5 inches out of the weed eater. You're ready to cut!