JLG 660SJ Service Manual - Manual (Page 107)

SECTION 3 - CHASSIS & TURNTABLE
3121202 – JLG Lift – 3-57
Overload Protection
STOP THE ENGINE WHENEVER CHECKING OR INSPECTING THE
CIRCUIT BREAKER.
The circuit breaker protects the generator windings from
overload. If the circuit breaker opens, generator output
stops. If the circuit breaker continues to open, check for
faulty equipment connected to the platform receptacles.
Inspecting Brushes, Replacing Brushes, and
Cleaning Slip Rings
Refer to Figure 3-51., Inspecting Generator Brushes,
Replacing Brushes, and Cleaning Slip Rings.
INSPECTING BRUSH POSITION
Inspect brush alignment with slip rings. View alignment
through the air vents in the stator barrel. The brushes
must ride completely on the slip rings.
INSPECTING BRUSHES
Remove the end panel. Inspect the wires. Remove the
brush holder assembly. Pull the brushes from the holders.
Replace the brushes if damaged, or if the brush is at or
near minimum length.
CLEANING SLIP RINGS
Visually inspect the slip rings. Under normal use, the rings
turn dark brown.
If the slip rings are corroded or their surface is uneven,
remove the belt to turn the shaft by hand for cleaning.
Clean the rings with 220 grit emery paper. Remove as little
material as possible. If the rings are deeply pitted and do
not clean up, consult generator factory service.
Reinstall the belt, brush holder assembly, and end panel.
CIRCUIT
BREAKER