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MAKE OPEN CIRCUIT TEST FOR FIELD WINDINGS
TESTING CARBON BRUSHES

Maintenance Manual For Hydraulic Excavator 230Lcr And 230Lcrd With Rock Drill 2
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TM 5-3805-280-24-2
Robert Bosch Starting Motor Repair
FIELD WINDING--INSTALLATION
Slightly warm windings and insert together with pole
shoes into field frame. Insert pole shoe screws.
60
Press suitable mandrel (see illustration) between pole
10
shoes.
13
Firmly tighten pole shoe screws and press out mandrel.
Check installed windings for shorted or open circuits.
A--85 mm (3.35 in.)
B--5 Chamfer
C--12--14 mm (0.47--0.55 in.)
D--75.80--75.85 mm (2.984--2.986 in.)
E--Wall Thickness 12--15 mm (0.47--0.59 in.)
RG,RG34710,2359 1915MAR971/1
CHECKING CARBON BRUSH PLATE FOR
GROUNDS
Set ohmmeter on its highest scale.
Place one test lead on commutator end frame. Place
other lead on brush holder.
If needle swings toward zero, the positive brush holder is
grounded and should be replaced.
RG,RG34710,2360 1915MAR971/1
16-95


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