JLG 660SJ Service Manual - Manual (Page 97)

SECTION 3 - CHASSIS & TURNTABLE
3121298 – JLG Lift – 3-53
Overload Protection
STOP ENGINE WHENEVER CHECKING OR INSPECTING CIRCUIT BREAKER.
The circuit breaker protects generator windings from over-
load. Generator output stops if circuit breaker opens.
If circuit breaker continues to open, check for faulty equip-
ment connected to platform receptacles.
Figure 3-72. Generator Circuit Breaker Location
Inspecting Brushes, Replacing Brushes, and
Cleaning Slip Rings
Refer to Figure 3-73., Inspecting Generator Brushes, Replacing
Brushes, and Cleaning Slip Rings.
INSPECTING BRUSH POSITION
Inspect brush alignment with slip rings. View alignment
through air vents in stator barrel. Brushes must ride com-
pletely on slip rings.
INSPECTING BRUSHES
1. Remove end panel. Inspect wires.
2. Remove brush holder assembly. Pull brushes from hold-
ers.
3. Replace brushes if damaged, or if brush is at or near min-
imum length.
CLEANING SLIP RINGS
1. Visually inspect the slip rings. Under normal use, the
rings turn dark brown.
2. If slip rings are corroded or their surface is uneven,
remove belt to turn shaft by hand for cleaning.
3. Clean rings with 220 grit emery paper. Remove as little
material as possible. If rings are deeply pitted and do not
clean up, consult generator factory service.
4. Reinstall belt, brush holder assembly, and end panel.
Circuit
Breaker