Overload Protection; Inspecting Brushes, Replacing Brushes, And Cleaning Slip Rings - JLG 1200SJP Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE

Overload Protection

STOP THE ENGINE WHENEVER CHECKING OR INSPECTING THE CIRCUIT
BREAKER.
The circuit breaker protects the generator windings from over-
load. If the circuit breaker opens, generator output stops. If the
circuit breaker continues to open, check for faulty equipment
connected to the platform receptacles.
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Inspecting Brushes, Replacing Brushes, and
Cleaning Slip Rings
Refer to Figure 3-72., 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.
Circuit
CLEANING SLIP RINGS
Breaker
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.
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