I inherited this trimmer and do not know how to add new string. There isn't any kind of a manual that we can find. The trimmer is a RYOBI 137R. Thank you.

Are you sure about the model number? I see several 30CC engine string trimmers by Ryobi. Two are the Ryobi RY30040B (SS30) and a RY30544 (SS30).

For both of these models, mix a high quality 2-cycle engine oil at 2.6 oz. per gallon of gasoline to pour into the gas tank. This ratio is used in several other Ryobi string trimmer models. Many Ryobi product manuals are available here: https://www.ryobitools.com/power-tools/support/manuals . Most Ryobi gas powered and 40V battery-powered tools will have a model number that starts with RY. The 18 V battery powered models often start with a P.

I hope this helps. If you add a comment with the actual model number, I may be able to provide more information.

Cindy Wells

https://www.youtube.com/watch?v=5Y5em-UtokQ

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You can get the manual on the link below.
http://lawnandgarden.manualsonline.com/mdownloads/019509bc-9a3f-4690-9f8c-b91a9a1a5235.pdf

You can look in the manufacturer web page , under manuals or just go to home depot web site and look for your model , scroll down and you will see product info and manual .

You likely are spot on with the diagnosis of bearings. But, I would hesitate to say that they are replaceable. Contact a local electric motor shop (alternator, starter, etc) to see if they would be able to change the bearings, and perhaps the bushings as well.

If it is a duel line trimmer then:

Cut two separate pieces of string, about 7 ft. each.

Stick the end of the line in the hole on the inside of spool.

Wind clockwise onto spool, putting the line that is closest to the ground on first.

Once you have winded this piece on, lock the last 4 inches of line through the slits on spool.

Repeat process for second piece of line, locking the last 4 inches in slot opposite the other locked in piece.

Put the spool on the trimmer, feeding the end of lines through either hole on trimmer.

Before you push the spool all the way on, pull the strings out of the locked position.

If it is a single line trimmer: Then just wind a single piece of string clockwise onto spool. This may need to be longer than 7ft.

Jim

Your instruction supplied with your trimmer gives you the information you need. It will recommend which size string to use. Both reels should use the same string.

50:1

To install string in the Ryobi you do not have to disassemble anything: Line up the two arrows on the inner and outer reel, remove any excess string, cut two pieces of string about 10 feet, feed line in the side holes, secure line in hole where it comes out the bottom (it only takes about 1/4in. to do so), pull strings tight, then turn the inner reel counter clockwise to wind it. If it sticks a little just pull line a little.
To remove the inner spool in order to remove line that has broken inside, to clean the mechanism, or to perform other maintenance, grasp the outer reel and unscrew the bump knob counter-clockwise. Mine is often very tight and requires pliers to get enough leverage. While you are in there, clean the inner reel and the inside of the outer reel to improve feed performance. The shaft rarely needs cleaning. Do not lubricate. After re-installing the reel, add string (0.080") as described above.