Honda UMK425T Owner's Manual page 55

3.Nylon-line cutting head replacement
• To avoid severe personal injury, make sure that the engine switch is
in the OFF position to prevent accidental starting.
• Use a genuine Honda replacement cutting head or its equivalent.
CAUTION:
Wear heavy gloves to protect your hands when replacing the cutting
head.
1.Stop the engine with the engine switch to the OFF position.
2.Turn the nylon-line head until you feel the tool drops into the hole in
the internal locking ring. Verify the nylon-line head does not turn.
3.Turn the nylon-line cutting head clockwise to remove it from the gear
case. Replace it with new one.
NYLON-LINE
CUTTING HEAD
52
4 mm HEXAGON WRENCH
GEAR CASE
LOCKING TOOL HOLE