Great Plains 3S-4000F Operator Manual - Manual (Page 53)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 49
2014-06-10 Table of Contents Index 195-394M
Battery Replacement
The battery operated acre counter uses 3 AA batteries.
The batteries should last between 5 and 10 years. The
acre counter will last much longer than that. Eventually
you will have to replace the batteries. The acre counter
will display “LObA” when the batteries require
replacement. Remove the acre counter from the
implement and undo the 4 screws on the back of the
case. This will separate the housing from the rear plate.
Replace the batteries with 3 high quality AA alkaline
batteries.
Note: This unit is dust and splash resistant, under no
circumstance should this unit be submerged in any
conductive, corrosive or flammable liquid.