Mtd OEM-190-133 owners guide
Operator’s Guide
OEM-190-133 (22”)
22-inch Mulching Kit
Model year 2003 or above
WARNING: Disconnect the spark plug wire and
move it away from the spark plug to prevent the
unit from accidentally starting. Protect hands by
using heavy gloves or a rag when grasping the cutting blade.
Installing the Mulching Blade
1. Remove the existing blade and blade adapter from your
mower by removing the center bolt and cupped washer
which hold the blade and adapter to the engine crankshaft. Remove the blade and adapter from the crankshaft.
2. Slide the new blade adapter, Figure 1, onto the crankshaft.
Star Blade
3
Adapter
Mulching
1
Blade
Blade Bell
4
Support
Figure 1: Installing the mulching blade.
Center Bolt
5
3. Place the blade with the side marked “bottom” (or with
the part number) facing away from the adapter. Be certain the star pattern on the blade adapter is properly
matched with the star pattern on the blade.
4. Align the blade bell support over the blade with the tabs
in the holes of the blade and insert the center bolt.
Tighten the center bolt securely to between 450 and 600
inch pounds.
Installing the Mulching Baffle
1. Lift up and hold the side-discharge chute deflector, Figure 2.
2. Insert the bottom lip of the mulching baffle inside the
chute opening, Figure 2.
3. Snap the baffle hooks over the hinge pin of the chute
deflector, Figure 2. The hooks will snap into place on the
hinge pin, locking the mulching baffle firmly onto the
mower.
4. Release the chute deflector.
NOTE: For proper assembly, install bottom lip inside chute
opening before placing hooks over the hinge pin.
NOTE: When you want to side discharge grass clippings
instead of mulching, simply lift the chute deflector and
remove the mulching baffle. It is not necessary to remove the
mulching blade in order to side discharge clippings.
Chute
Deflector
2
Mulching
Baffle
Hooks
n
i
P
e
g
n
i
H
2
Chute
Opening
1
Lip of Mulching Baffle (install inside chute opening)
Figure 2: Installing the mulching baffle.
Using your Mulching Kit
Be sure that the lawn is clear of stones, sticks, wire, or other
objects which could damage the lawn mower or engine. Such
objects can be accidentally thrown by the mower in any direction and cause serious personal injury to the operator and
others.
WARNING: If you strike a foreign object, stop the
engine. Remove the wire from the spark plug,
thoroughly inspect the mower for damage, and
repair the damage before restarting and operating
the mower. Extensive vibration of the mower during operation
is an indication of damage. The unit should be promptly
inspected and repaired.
• For effective mulching, do not cut wet grass because it
tends to stick to the underside of the deck, preventing
proper mulching. For extremely heavy cutting (thick
grass), reduce the width of cut. The ground speed
should be adjusted to the condition of the lawn.
• For a healthy lawn, never cut more than one-third off the
total length of the grass at any one cutting. Lawn should
be cut in the fall as long as there is growth.
• For the most effective mulching and to provide the best
cut, operate the mower at full throttle.
• Be certain to clean the underside of the deck after each
use to avoid a build-up of grass which could prevent
proper mulching.
REF. NO. PART NO. DESCRIPTION
1 742-0742A 22-inch Mulching Blade
2 631-04045 Mulching Baffle
3 748-0376C Star Blade Adapter
4 736-0524B Blade Bell Support
5 710-1044 Center Bolt
Specifications subject to change without notice or obligation.
PRINTED IN U.S.A.
MTD LLC P.O. BOX 361131 CLEVELAND, OHIO 44136-0019
FORM NO. 769-01173
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