Kubota F2890E Operator's Manual page 35

14 OPERATING THE ENGINE
(1) Dead battery
(2) Jumper cables
(3) Frame
(4) Helper battery
Connect cables in numerical order.
Disconnect in reverse order after use.
A This machine has a 12 volt negative (-) ground starting
system.
A Use only same voltage for jump starting.
A Use of a higher voltage source on machine could
result in severe damage to machine electrical system.
Use only matching voltage source when "Jump
starting" a low or dead battery condition.