Troy-Bilt TB425 XP Operator's Manual page 16

Removing Old Trimming Line and Obstructions (Bump Head)
1. When the trimming line runs out, the last piece should
automatically eject from the cutting head. If it does not, pull the
remaining line out of the cutting head.
2. If the line will not come out or the cutting head is otherwise
obstructed:
a. Insert a flat-head screwdriver into the notch on the tab (Fig. 25).
b. Gently tilt the screwdriver up and hold it in place (Fig. 25).
c. While holding the screwdriver in place, gently twist the
screwdriver to unlock the tab from the tab slot (Fig. 26).
d. Remove the spool cover (Fig. 26). DO NOT remove the spring
from the cutting head base (Fig. 26).
e. Push the bump knob through the spool cover. (Fig. 26). If the
eyelets come off, reinsert the eyelets on the spool cover (Fig. 23).
NOTE: DO NOT separate the bump knob from the inner reel (Fig. 26).
f. Remove any old trimming line and/or obstructions.
g. Use a clean cloth to clean the inner reel, cutting head base
and spool cover (Fig. 26).
h. Insert the bump knob and inner reel into the spool cover (Fig. 26).
i. Align the tabs on the spool cover with the tab slots on the
cutting head base (Fig. 26). Push the spool cover onto the
cutting head base until the tabs securely snap into place.
MAINTAINING THE BLADE
WARNING:
Do not sharpen the blade. Sharpening the
blade can cause the blade tip to break off while in use.
This can result in severe personal injury.
The blade has a second cutting edge. If the blade becomes dull,
remove the blade, turn it upside down and reinstall the blade. If both
sides are dull, replace the blade. Refer to Replacing the Blade.
Bump Knob
5 in. (12.5 cm)
Tab
Notch
Spool Cover
Bump Knob
Spring
Cutting
Head Base
16
5 in. (12.5 cm)
Fig. 24
Flat-head
Screwdriver
Fig. 25
Tab
Inner Reel
Tab Slot
Fig. 26