JLG 450A_AJ Series II Service Manual - Manual (Page 102)

SECTION 3 - CHASSIS & TURNTABLE
3-62 – JLG Lift – 3121290
3.9 GENERATOR
Every 250 hours
Check drive belt 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 frequent
service.
Blow out inside of generator with compressed air every 500
hours of service. Clean monthly If operating in a hostile envi-
ronment.
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 equipment con-
nected to platform receptacles.
Brushes and Slip Rings
Refer to Figure 3-43., Generator Brushes and 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 mate-
rial 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