Honda HRB217HXA Owner's Manual page 34

Blade Installation
1.
2.
3.
Clean dirt and grass from around the blade mounting area.
Install the blades using the two blade bolts and special washers as
shown. Be sure to install the special washers with the concave side
toward the blades and the convex side toward the bolts.
The blade bolts and washers are specially designed for this
application. When replacing bolts and washers, use only genuine
Honda replacement parts.
Tighten the blade bolts with a torque wrench. Use a wooden block
to prevent the blades from turning when tightening the bolts.
Blade bolt torque: 36
-
43 ft-lb; 5.0
-
6.0 kg-m (49
-
59 N.m)
If you do not have a torque hrench, have an authorized Honda
servicing dealer tighten the blade bolts before you use the mower.
If the blade bolts are overtightened, they could break. If the blade
bolts are not tightened enough, they could loosen or come out. In
either case, it would be possible for the blades to fly off while you
are operating the mower.
WOODEN BLOCK
32