JLG 450A_AJ Series II Service Manual - Manual (Page 144)

SECTION 3 - CHASSIS & TURNTABLE
3-94 – JLG Lift – 3121180
3.12 GENERATOR
Every 250 hours
Check drive belt for proper tension every 250 hours of
operation.
Every 500 hours
Service generator brushes and slip rings every 500 hours
of operation. Hostile environments may require more fre-
quent service.
Blow out inside of generator with compressed air every
500 hours of service. Clean monthly If operating in a hos-
tile environment.
Overload Protection
STOP ENGINE WHENEVER CHECKING OR INSPECTING CIRCUIT
BREAKER.
The circuit breaker protects generator windings from over-
load. If circuit breaker opens, generator output stops. If
circuit breaker continues to open, check for faulty equip-
ment connected to platform receptacles.
Brushes and Slip Rings
Refer to Figure 3-60., 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
Remove end panel. Inspect wires. Remove brush holder
assembly. Pull brushes from holders.
Replace brushes if damaged, or at or near minimum
length.
CLEANING SLIP RINGS
Visually inspect slip rings. Rings turn dark brown under
normal use. If slip rings are corroded or their surface is
uneven, remove belt to turn shaft by hand for cleaning.
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.
Reinstall belt, brush holder assembly, and end panel.
1/2 in.
(13 mm)
CIRCUIT
BREAKER