Use and Care Manual
56-VOLT LITHIUM-ION CORDLESS LAWN MOWER — LM2020SP/LM2020
36
Problem Cause Solution 
The mower does not 
mulch properly.
 ◾
Wet grass clippings are sticking to the 
underside of the deck.
 ◾
The mower is set to cut too much grass 
at once.
 ◾
Wait until the grass dries before 
mowing.
 ◾
Raise the deck to a higher cutting 
height setting.
There is excessive 
vibration.
 ◾
The cutting blade is loose.
 ◾
The cutting blade is unbalanced. 
 ◾
The cutting blade is bent.
 ◾
The motor shaft is bent.
 ◾
Tighten the blade bolt.
 ◾
Balance the blade following the 
instructions.
 ◾
Replace the blade.
 ◾
Contact the service center.
The handle-locking 
clamps cannot be closed 
in position.
 ◾
The side rails are not fully extended.
 ◾
Fully extend the side rails, then lock 
the clamps.
Mower is difficult to 
pull back when the self 
propel is turned off.
 ◾
The wheels are temporarily locked.
 ◾
Simply push ahead slightly and then 
move the mower as desired.
The motor works but the 
blade doesn’t cut the 
grass.
 ◾
The blade is not tightened to the required 
torque.
 ◾
Re-tighten the blade. The 
recommended torque for the blade bolt 
is 36-43 ft-lb (49-59Nm).
Short running time of 
the mower with included 
battery.
 ◾
Grass conditions and cutting height 
setting will greatly affect the battery run 
time. The claimed run time is based on a 
light load condition.
 ◾
Raise the blade height and slow your 
pace to reduce the cutting load.










