Meen Green MGP-20 Owner's Manual - page 22
Mower blade maintenance
Check the mower blades daily, they are the key to power
efficiency and well groomed turf. Keep them sharp, a dull blade
will tear rather than cut the grass, leaving a brown ragged top on
the grass within a few hours. A dull blade also requires more
power. Replace any blade which is bent, cracked or broken.
WARNING: Never attempt to straighten a bent blade by heating, or
weld a cracked or broken blade as the blade may break and cause serious
injury. Replace worn or damaged blades.
DANGER: Never work with blades while key is in
the ignition switch. Turn key to OFF position,
remove key from switch and disconnect battery cables by pulling out on
LARGE RED
battery quick disconnect handle!
Block up mower when you must work under it. Wear gloves
when handling blades. Always check for blade damage if mower strikes
a rock, branch or other foreign objects during mowing!
WARNING: Always wear adequate eye protection when grinding mower blades.
Mower blade removal
Use a 1/2” wrench or socket to remove the 3/8” cap screw
holding the blade to the motor shaft from underneath. It may be
necessary to use a 1-1/4” channel lock pliers to keep the blade adapter from
turning while removing blade cap screw.
NOTE: The blade adapter will come off when the blade cap
screw 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” 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.
Mower blade installation
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 1/2”
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”
channel lock pliers to keep the blade adapter from turning. Torque cap
screws on motor shafts to 50 foot-pounds (67.8 Nm) when reinstalling blades.
IMPORTANT: The blade sail (curved part) must be pointing
upward toward the inside of the deck to ensure proper cutting.
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.
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