Toro 77225 Operator's Manual

Form No. 3357-630 Rev. A

Mulch Kit for 54-inch Tractor Decks

Models 77225 & 190-841-190

Operator’s Manual

NOTE: Model 841 Mulch Kit is designed for use on tractors equipped with 54-inch cutting deck only.This will NOT
mount, nor operate safely or properly on any other tractor regardless of the tractor’s compatibility with similar
accessories.

WARNING: Restrict the use of this accessory and the tractor to persons who read, understand and

follow the warnings and instructions in this manual, the tractor manual and on the machine.

Customer Support

1. Visit mtdproducts.com for many useful suggestions; click on Customer Support button to access database.

2. If you prefer to reach the Customer Service Line, please call 1(800) 800-7310.

Locating Model Number

Before you install this kit, please locate the model plate on the mulch plug and note the model and serial numbers.
This information will be necessary to use the manufacturer’s web site and/or seek help from Customer Support
Department or White Outdoor dealer.

Before Assembly

WARNING: Cutting blades are sharp. Always protect hands by wearing heavy leather work gloves or

use heavy rags to handle blades.

• Before beginning installation, place the tractor on a firm and level surface.

• Place the PTO in the disengaged (OFF) position, stop the tractor engine and set the parking brake.

• Make sure the kit contains a mulch plug (part # 731-04651) and three mulching blades (part # 742-0678).

Installing Mulching Blades

• Remove the cutting deck from beneath the tractor
following instructions on DECK REMOVAL in the
MAINTENANCE section of your tractor’s
Operator’s Manual.

• Gently flip the deck over to expose its underside.

• Place a block of wood between the center deck
housing baffle and the cutting blade to act as a
stabilizer. See Figure 1.

• Use a 15/16" wrench to remove the hex flange nut
that secures the blade to the spindle assembly.
Save the hardware.

Hex Flange Nut

Place wood
block this way

NOTE: The hex flange nut has a right-handed thread

pattern. Do not attempt to force the nut in the wrong
direction. Doing so may damage the nut and create a
safety hazard.

PRINTED IN U.S.A.

Spindle Assembly

Figure 1

FORM NO.

770-10591A.fm
(3/2004)

• Install one of the three new blades included in the mulch kit on the spindle assembly. Be sure to install the blade
with the side of the blade marked ‘‘Bottom’’ (or with a part number stamped in it) facing the ground when the
mower is in the operating position.

• Secure with the hex flange nut removed earlier .

• Use a torque wrench to tighten the blade spindle hex flange nut to between 70 to 90 foot-pounds.

• Repeat with the other two blades. Then flip the d eck back to its ope rating position.

• Remount the cutting deck following instructions in the owner/op erator’s manual of the tracto r.

Installing Mulch Plug

• Locate two rectangular holes on the cutting
deck surface.

• Pivot the discharge chute up to access the deck
opening. See Figure 2.

• Insert the mulch plug in the deck opening,
aligning the top edge of the plug with the deck.
Make sure the notches on the plug are in the
slots on the deck opening. See Figure 2.

• Lightly tab on the plug with your hand so that the
notches fit properly under the chu te tabs and the
plug is secure.

Mulching

The mulch plug allows the tractor to recirculate
grass clippings into the lawn where they act as a
natural fertilizer.

Observe following points for best results in
mulching:

• Never attempt to mulch if the lawn is damp. Wet grass tends to stick to the underside of the deck preventing
proper mulching.

• Do not attempt to mulch more t han 1/3 the t otal height of th e grass or app roximately 1-1/2 inch es. Maintain a
slow ground speed to allow the grass clippings more time to be mulched effectively.

• Always position the throttle control lever of the tractor in the FAST (rabbit) positio n while mulching.

Insert mulch
plug this way

Raise discharge

chute this way

Deck opening

Figure 2

WARNING: Do not under any circumstances attempt to mow through grass which exceeds 10 inches in

height. Debris may build up on the mowing deck and come into contact with belts and other m oving parts or
the engine’s exhaust system presenting a potential fire hazard .

MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019