Periodically check the condition of the following electric motor components.
The electric motor is located inside of the rear hydraulic valve distributor support cover (AC Lithium) or inside of the ground hydraulics compartment in the center of the chassis (Bi-Energy).
POWER SUPPLY TERMINALS
Check tightness of the nuts on the power supply terminals and make sure the insulation is intact.
Keep air intakes clean and make sure the fan can rotate freely.
Check the condition of the bearings, in the event of noise contact JLG for replacement, the life of the bearings is reduced significantly in heavy duty operating conditions.
NOTE: This motor is "brushless" therefore no brushes need to be checked or replaced.
Source: MaintainX (Community Member)