JLG X23J - X700AJ Service Manual - Manual (Page 206)

SECTION 3 - CHASSIS & TURNTABLE
3121448 – JLG Lift – 3-179
BRUSH CONTINUITY CHECK
Check for continuity between the positive (+) brushes(1)
and negative (-) brushes (2).
There should be continuity between both the positive-
brushes.There should be continuity between both the
negativebrushes.There should be no continuity from
either positive brush to either negative brush.
If the correct continuity of the positive (+) brushes is not
obtained, replace the center bracket (page 10-9).
If the correct continuity of the negative (-) brushes is not
obtain, replace the negative (-) brushes.
ARMATURE MICA DEPTH
Visually inspect the commutator surface for dust, rust,or
other damage. If necessary, wipe it with a clean lint-free
cloth. If rusted or damaged, dress with a fine emery cloth.
When the mica is clogged, or its depth is smaller than the
service limit value, recut the grooves using a hacksaw
blade or a small file.
STANDARD:1.0 mm (0.04 in)
SERVICE LIMIT:0.2 mm (0.01 in)
ARMATURE CONTINUITY CHECK -
COMMUTATOR TO SHAFT
Check for continuity between the commutator and the
armature shaft
Replace the armature if continuity exists between any of
the commutator segments and the armature shaft.
ARMATURE CONTINUITY CHECK -
COMMUTATOR SEGMENTS
Check for continuity between segments. If an open circuit
(no continuity) exists between any two segments, replace
the armature.
(1)
(1)
(2)
(2)