Troy-Bilt Straight Shaft String Trimmer, 25cc 2-Cycle Engine, 16in. Cutting Width, Model# TB25SB

You would contact the manufacturer for replacement parts on the string trimmer.

The string trimmer would not have electric start.

Part 1 - Removing the Inner Reel
1. Hold the cutting head in place. Turn the bump knob counterclockwise to unscrew it from
the cutting head.
NOTE: The outer spool will remain attached to the unit.
2. Inspect the bolt inside the bump knob to make sure it moves freely. Replace the bump
knob if it is damaged.
3. Remove the inner reel from the outer spool.
4. Remove the spring from the inner reel.
5. Use a clean cloth to clean the inner reel, spring, arbor and inner surface of the outer spool.
6. Check the indexing teeth and holding slots for wear. If necessary, remove burrs or replace
the inner reel and outer spool.
Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.
Part 2 - Winding New Trimming Line onto the Inner Reel
• If using single line, refer to Winding Single Line.
• If using split line, refer to Winding Split Line.
• If using a pre wound inner reel, proceed to Part 3 - Installing the Inner Reel.
Winding Single Line
1. Cut one 12-foot (3.7 m) length of new single trimming line. Fold the line in half to create a loop in
the middle.
2. Insert the loop into the slot in the split wall. Wind the line tightly in the direction shown on
the bottom of the inner reel until about 6 inches (150 mm) of line remains. Keep the top half of the
line above the split wall and the bottom half of the line below the split wall.
3. Insert the two 6-inch ends into the two .095 holding slots.
NOTE: Failure to wind the line in the direction indicated will cause the cutting head to operate incorrectly.
Proceed to Part 3 - Installing the Inner Reel.
Winding Split Line
1. Cut one 6-foot (1.8 m) length of new split line trimming line. Split each end about 6 inches (150 mm).
2. Using one split end, insert one line into the top hole and the other line into the bottom hole in the
inner reel.
3. Wind the line tightly in the direction shown on the bottom of the inner reel. The split wall will
automatically divide the line. Wind the line until it is completely divided and about 6 inches (150 mm) of line remains.
NOTE: Failure to wind the line in the direction indicated will cause the cutting head to operate incorrectly.
4. Insert the two 6-inch ends into the two .095 holding slots.
Proceed to Part 3 - Installing the Inner Reel.
Part 3 - Installing the Inner Reel
1. Pass the two line ends through the eyelets in the outer spool.
2. Place the spring inside the inner reel.
3. Insert the inner reel into the outer spool. Push the inner reel and outer spool together.
4. While holding the inner reel and outer spool together, firmly pull the two line ends to release them
from the holding slots.
5. While holding the inner reel and outer spool together, screw the bump knob on clockwise.
Tighten the bump knob securely.

This trimmer weighs about 11 pounds.

The trimmer is compatible with the Troy-Bilt trimmer plus attachments.

This item has a dual-line bump-feed head.

This trimmer requires a 40:1 fuel to oil mixture.

The string trimmer is not jump start capable.

The Troy-Bilt jump start is not compatible with the trimmer.

The manufacturer does not recommend use of after market trimmer heads on this trimmer.