Doosan DX60R Shop Manual page 407

Armatire Coil Continuity Test
Check for continuity between the commutator segments using a
multimeter (Figure 356). The multimeter should indicate
continuity.
If the multimeter does not indicate continuity, replace the
armature.
Armature Coil Insulation Test
Check for continuity between a commutator segment and the
shaft or armature using a multimeter (Figure 357). The
multimeter should not indicate continuity.
If the multimeter indicates continuity, replace the armature.
Measure Armature and Commutator Run-Outs
Measure the armature core run-out and the commutator run-out
using a dial indicator (Figure 358). Replace the armature if
either of the measurements is less than the limit.
See "Starter Motor Specifications" on page -220 for the service
limit.
Engine
Figure 356
Figure 357
Figure 358
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