Motor SEM
Page 67
MA-100-03
SC-100
INSPECT
Brushes
Measure the length of each motor brush.
•
If any one brush is less than or equal to the
service limit specified in section
Service Limits
,
then all four brushes should be replaced. Refer to
Replacing the Brushes
section for information
regarding replacing the motor brushes.
•
A burnt brush lead is an indication of excessive
motor current or another brush was stuck in the
brush holder, not in contact with the commutator.
Commutator
Measure the diameter of the commutator.
•
If the commutator is less than the minimum
diameter specified in section
Service Limits
, then
the motor must be replaced.
Measure the commutator undercut depth in 5-places
around the commutator.
•
If any one of the measurements is less than the
minimum undercut depth specified in
Service
Limits
at the end of this section, then the
commutator must be undercut. Refer to
Repair
Commutator
section for information regarding
undercutting the commutator.
Inspect the commutator for groves.
•
If the commutator is grooved then it must be
machined on a lathe. Do not machine the
commutator past the minimum diameter specified
in
Service Limits
section. Refer to
Repair
Commutator
section for information regarding
machining the commutator.
This section is one section of a complete service
manual. Before starting any procedure, read all
warnings and instructions that are located in the
Service Guidelines chapter.
WARNING
Inspect the commutator for burn marks.
•
Burn marks and/or raised commutator segments
90 or 180 degrees apart is evidence of a shorted
armature. A tool called a growler is required to
reliably test for a shorted armature.
Inspect the commutator for raised segments. Raised
segments could be a result of a stalled motor or shorted
armature. A tool called a growler is required to reliably
test for a shorted armature.
•
If the armature is not shorted then the raised
segments can be removed by machining the
commutator. Do not machine the commutator
past the minimum diameter specified in
Service
Limits
. Refer to
Repair Commutator
section for
information regarding machining the commutator.
Armature Windings
Visually inspect the armature windings for burnt
insulation. Burnt insulation is a direct result of motor
overheating and could lead to a shorted armature.
•
If the insulation is cracked or burnt, then it is
recommend that the armature or motor be
replaced.
Note: If the armature has been burnt then there
is a good possibility that the field windings
may also be burnt. Symptoms indicating a
shorted field include high motor current, lack
of power and possibly excessive speed.
Using a growler, test the armature for shorts.
•
If the armature is shorted, then it is recommend
that the armature or motor be replaced.
Using the continuity function of digital multi meter, check
the continuity around the entire commutator by placing
one test lead against one of the commutator segments
and the other test lead against all of the other segments
one at a time. There should be continuity around the
entire commutator.If any segment indicates an open
circuit, then the motor must be replaced.
Summary of Contents for SC-100-24
Page 6: ......
Page 12: ...Page 12 MA 100 03 Introduction SC 100 Notes...
Page 16: ...Service Maintenance Guidelines Page 16 SC 100 MA 100 03 PERIODIC MAINTENANCE CHECKLIST...
Page 18: ...Service Maintenance Guidelines Page 18 SC 100 MA 100 03 Notes...
Page 19: ...Table of Contents Special Tool List Special Tool List Tool List 18 Troubleshooting Guide 20...
Page 24: ...Lubrication Page 24 SC 100 MA 100 03 LUBRICATION AND FLUIDS CHART...
Page 26: ...Lubrication Page 26 SC 100 MA 100 03 Notes...
Page 40: ...Transaxle GT Page 40 SC 100 MA 100 03 Notes...
Page 46: ...Transaxle Page 46 modelnumber manualnumber...
Page 56: ...Steering Page 56 SC 100 MA 100 03 Notes...
Page 64: ...Brakes Page 64 SC 100 MA 100 03 Notes...
Page 80: ...Tires Wheels Page 80 SC 100 MA 100 03 Notes...
Page 102: ...Replacement Parts Page 102 SC 100 MA 100 03 Not available at time of printing BRAKE LINKAGE...
Page 122: ...Replacement Parts Page 122 SC 100 MA 100 03 Not available at time of printing STEERING LINKAGE...
Page 124: ...Replacement Parts Page 124 SC 100 MA 100 03 Not available at time of printing Notes...
Page 125: ......