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Motor SEM
Page 63
MB-248-18
B0-248; B0-254; BT-248; BT-280 (36v & 48v)
INSPECT
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.
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 at the end of this section. 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.
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.
Bearing
A faulty or worn bearing is typical a accompanied with
a report of noise from the motor that could be called a
growl or grinding noise and is best diagnosed while in
the vehicle using a mechanics stethoscope.
Since disassembly of the motor typical damages the
bearing, the bearing should be replaced whenever the
motor is disassembled.
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.
WARNING
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.
Summary of Contents for B0-248-36
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Page 94: ...Replacement Parts Page 94 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v AXLE ASSEMBLY FRONT...
Page 124: ...Replacement Parts Page 124 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v Fiberglass Cab...
Page 126: ...Replacement Parts Page 126 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v Dump Bed...
Page 134: ...Replacement Parts Page 134 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v MOTOR...
Page 138: ...Replacement Parts Page 138 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v...
Page 140: ...Replacement Parts Page 140 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v STEERING GEAR...
Page 142: ...Replacement Parts Page 142 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v STEERING LINKAGE...
Page 146: ...Replacement Parts Page 146 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v SUSPENSION REAR...
Page 148: ...Replacement Parts Page 148 MB 248 18 B0 248 B0 254 BT 248 BT 280 36v 48v WHEELS AND TIRES...