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6 Docking Station and Power Supply Safety
■ Stop and inspect the robotic mower for damage if it hits a 
foreign object or exhibits unusual operating behavior, 
such as abnormal vibration. After disabling the robotic 
mower, inspect the cutting assembly (mowing blade, 
blade shaft and blade mount). If the unit continues to 
function abnormally, take it to an authorized STIHL iMow 
servicing dealer for service before restarting and allowing 
the robotic mower to operate.
■ To reduce the risk of severe personal injuries from 
unintentional starting:
■ A damaged or loose mowing blade may vibrate, crack, 
break or come off the robotic mower, which may result in 
serious or fatal injury.
– Make sure the mowing blade is undamaged and 
properly tightened before starting work.
– If the mowing blade loosens after being properly 
tightened, stop work immediately and have the 
robotic mower repaired by your authorized STIHL 
iMow servicing dealer.
– Never use a robotic mower with a loose or damaged 
mowing blade.
6.1 Introduction
This section contains the general safety warnings and 
instructions prescribed for the docking station and power 
supply. Additional important warnings and instructions are 
provided in subsequent sections of this manual.
READ AND FOLLOW ALL SAFETY INSTRUCTIONS.
WARNING
■ When using the docking station and power supply, basic 
safety precautions should always be followed to reduce 
the risk of fire, electric shock and personal injury and 
property damage, including the following:
1)READ AND FOLLOW ALL SAFETY INSTRUCTIONS.
2)Read and follow all instructions that are on the docking 
station and power supply or provided with the docking 
station or power supply.
3)Do not use an extension cord.
4)Reference the National Electrical Code, ANSI/NFPA 70, 
specifically for the installation of wiring and clearances 
from power and lighting conductors.
5)Installation work and electrical wiring must be done by 
qualified person(s) in accordance with all applicable 
codes and standards, including fire-rated construction.
6)Do not install or use within 10 feet of a swimming pool.
7)Do not use in a bathroom.
8)WARNING: Risk of Electric Shock. When used outdoors, 
install only to a covered Class A GFCI protected 
receptacle that is weatherproof with the power supply 
connected to the receptacle. If one is not provided, contact 
a qualified electrician for proper installation. Ensure that 
the power supply and cord do not interfere with completely 
closing the receptacle cover.
9)WARNING: Risk of Fire. Installation involves special 
wiring methods to run wiring through a building structure. 
Consult a qualified electrician.
10)WARNING: Not for use with receptacles that are 
weatherproof only when the receptacle is covered 
(attachment plug cap not inserted and receptacle cover 
closed).
SAVE THESE INSTRUCTIONS – This manual contains 
important safety and operating instructions for the STIHL 
ADO 401 Docking Station and the OWA-60U-27VUSM 
power supply.
– Never touch the mowing blade with your 
hands, feet or any other part of your body 
without first de-activating the machine. 
Press and hold the STOP button for 5 
seconds and confirm that the mowing 
blade has stopped.
6 Docking Station and Power Supply 
Safety