Honda HHT31S Owner's Manual page 47

Saw Blade
The UNBA types are shipped with a manual nylon cutting-line head installed on the trimmer. If the saw
blade is needed, move the ignition switch to the STOP (O) position and disconnect the spark plug cap
from the spark plug. Wear protective gloves when working around the cutting-line head and saw blade.
Cutting-Line Head Removal
1. Align the gear case hole with the groove in
cover plate/spacer A. Insert a 4 mm hex
wrench or equivalent into the gear case hole
to prevent the left-hand threaded output shaft
from turning.
2. Hold the wrench and rotate the cutting-line
head in the direction of the arrow to remove
the cutting-line head.
Debris Shield Removal/Installation
Remove the cutting-line debris shield and install the brush/wood blade debris shield.
Tighten the bolt/washers:
TORQUE: 2.5 ft-lb (3.4 N·m, 0.34 kg-m)
5 x 28 mm
BOLT/WASHER (4)
SPACER (2)
[3/32" (2.30 mm) thick]
CUTTING-LINE
DEBRIS SHIELD
(with cutoff knife)
CUTTING-LINE HEAD
SPACER B
COVER PLATE/
SPACER A
BOLT/WASHER (4)
SPACER (2)
[3/32" (2.3 mm) thick]
BRUSH/WOOD BLADE
DEBRIS SHIELD
ASSEMBLY
OUTPUT SHAFT
(left-hand thread)
5 x 28 mm
45