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9. Mower blade removal
MGUPN190: The torque values for the nut that holds in the blade.
Refer to your approved ZTR Jack instructions to raise the front of MEAN GREEN mower. Use a 3/4”
(19,05mm) wrench or socket to remove the 1/2” (12,7mm) hex head bolt holding the blade to the motor
shaft from underneath. It may be necessary to use a 1-1/4” (31,75mm) channel lock pliers to keep the blade
adapter from turning while removing blade bolt.
NOTE:
The blade adapter will come off when the blade bolt is removed. Touch-up sharpening can be done
with a file. Check the blades for balance following grinding. A commercial balancing tool is available through
most hardware supply stores, or balancing can be done by placing the blade on an inverted line punch or
1/2” (12,7mm) bolt. Blade should not lean or tilt. Spin the blade slowly, blade should not wobble. If blade is
out of balance, true it up before reinstalling. Lay the blade on a flat surface and check for distortion. Replace
any distorted blade.
10. Mower blade installation (refer Fig. X1 and Fig. X2)
Do not re-use spindle bolts which have stripped, worn or undercut threads. Make sure that the blade adapter
is seated properly on the blade motor shaft before tightening the blade cap screw. Use a 3/4” (19,05mm)
socket with a torque wrench to re-attach the blade to the motor shaft from underneath. It will be necessary
to use a 1-1/4” (31,75mm) channel lock pliers to keep the blade adapter from turning. Torque cap screws
on motor shafts to 41N.m (30 foot-pounds) for motors when reinstalling blades.
IMPORTANT:
The blade sail (curved part) must be pointing upward toward the inside of the deck to ensure
proper cutting.
Rear discharge mulching decks may require a special “LH” blade on the right side of the
deck. Be sure to replace blades in proper location.
IMPORTANT:
When mounting blades, rotate them after installation to ensure blade tips do not touch each
other or sides of the mower.
WARNING:
Failure to correctly torque the bolt may result in the loss of the blade which can cause
serious injury.
WARNING:
Mower blades are sharp and can cut. Wear gloves and use extra caution when servicing
them.
