Question about Craftsman Convertible 25cc. Gas Line Trimmer

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Replacing pull cord --After clutch drum

I removed the clutch drum and now under it is a piece with a spring in a circle that is held into place by a circular part. How do i remove this part?

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This is the clutch. It is threaded onto the crankshaft (r/hand threads)..get a smaller size flat head chisel and a mediium size hammer and give a few good whacks on the raised solid part near the middle of the clutch...not near the springs nor on the outer edges. This should loosen it and it will unscrew right off the crank..If it's stubborn, spray penetrating oil (Liquid Wrench or PB Blaster) on it and let it soak overnight. Hope this helps you.

Posted on Jul 20, 2010


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Posted on Jan 02, 2017


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Replace pull cord

Replacing a pull cord is not easy. After you remove the shaft, then the drum cover, you are left with the drum and clutch. There is a screw in the center of the drum which has to come off. Then there is a the clutch which if not removed correctly will come apart on you. Only after both parts are remove can you get to the pull cord.

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Rope will not recoil complety

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1 Answer

How to reload pull cord spring assembly?

not it not easy but can be done

found this on a web site should tell you what you need to know


I removed the screws from the bottom of the unit to separate mechanism that held the blades from the engine. This revealed a clutch on the end of the drive shaft. I removed the springs so I could remove the two halves of the centrifical clutch. I did this so I could then remove the mount these two halves were around. This mount had an arrow and the word 'off' on it. I placed a block of wood against this mount and hit the wood (protecting the mount) as to spin off the mount in the direction of the arrow. A few sharp licks with the hammer and the mount started to come off. I removed it by hand then. Next I removed screws and spark plug so I could get the green housing off where the cord was mounted. Inside this housing is a white spool the cord was on. Becareful with the next step. To replace the cord I removed the spool the cord is wound on but be careful, under the spool is a metal housing under which is the spring that rewinds the cord when you pull start the unit. The end of the white spool that is out of your sight meshes with the end rewind spring. If you pull too far up on the spring or the metal housing that keeps the spring in place you will have spring everywhere and possibly toward your face becareful. So Loosen the two screws and turn the tabs out of the way that hold down the white cord spool. Slowly work the white cord spool off. Replace the cord on the spool making sure you wind it in the proper direction. Then replace the spool and mesh it with the spring. Turn the spool to wind the spring and retention the pull cord rewinding spring. re assemble unit. Good luck! This is not a step by step but I believe it will get you what you need.

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3 Answers

How do you remove the clutch drum assembly for model #316.791890

Your clutch drum is held on with a Torx head screw which is screwed into the end of the crankshaft. To lock the engine up so crank won't turn, remove the spark plug, rotate the engine so the piston is down and put some clean pull rope or otherwise soft material in cylinder. ...make sure it is something that won't hang up in the ports on the sides. Then when you rotate the crank, it will compress the rope or soft material, locking up the engine to facilitate removal of the Torx screw, The screw will come loose but will probably not come all the way out...that's just the way they made it.

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Outboard drums (drums on the outside of the clutch) are held on by a nut or e-clip.

Inboard drums are held on by the clutch which is threaded onto the crankshaft. And there is the challange.
***NOTE all chain saw clutches have LEFT hand threads, so, rightey loosey, lefty tightey. (just backwards from everything else)

this will most certainly shear the flywheel key or damage the flywheel !!!!! (after 35 years, you can ask me how I know that, LOL)

1) Use a piston stop to hold piston from moving: THIS IS A MUST !!!
Ok, so you do not have one, let's make one.
a) remove the spark plug
b) insert a piece of recoil rope into the cylinder hole, leaving a tail to remove it by. (rope, large shoe string, anything that is soft, that is aprox 1/4 to 5/16 in diameter to place into the spark plug hole to help the piston to stop it's travel by filling up the empty space. Just make sure you can remove it later)
c) secure the saw (extra set of hands may be needed) and with a suitable wrench on the clutch center, rotate the clutch to the right until piston comes to a stop. With a hammer, tap the wrench to aid in rotation. This can be very difficult, and may take several taps.
d) after removed, inspect and grease the drum bearing before re-assemlby.
e) upon re-assembly of clutch, tighten by hand only, NO hammer required. The force of the chain will tighten the clutch.
f) remove the rope, and re-install the spark plug.

I’m happy to assist further over the phone at

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1 Answer

Need a diagram of the clutch bearing in order to take it apart from vehicle.The 1996 Isuzu Troper repair book we have does show an inside view and we cannot get this piece off.

I cant send a diagram but I can explain how. To remove the unit from the clutch arm. The unit is held in with a spring clip pull the bearing out and you will see where the spring clip is holding they are pull one end of the spring down and over the flange which is holding it and the other end up the unit will slide off. To remove the bearing from the unit clamp the outside of the bearing in a vice and with a socket and hammer tap out the cast iron center. The clutch arm is also held in with a spring clip over a ball in the bell housing a quick firm pull will take it off if needed.

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2 Answers

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