Maintenance, Service, and Repair
Motor Service
Page 3
3. 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.
4. 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.
5. 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.
6. 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
section. Refer to
Repair
Commutator
section for information regarding
machining the commutator.
7. 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.
8. Using a growler, test the armature for shorts.
• If the armature is shorted, then we recommend
that the armature or motor be replaced.
9. 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.
10. Using the continuity function of digital multi meter,
check the continuity from any one of the
commutator segments and the armature frame. If
it is not an open circuit, then the armature is
shorted and the motor must be replaced.
11. Measure the armature and field resistance (refer
to
Service Limits
table at end of this section). If
the armature of field resistance is not within
specification then the motor must be repaired or
replaced.
Typical burn mark on a shorted armature
Summary of Contents for R 380-36
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Page 64: ...Maintenance Service and Repair Steering Page 14 Exploded View of Steering Gear...
Page 90: ...TAYLOR DUNN...
Page 128: ...TAYLOR DUNN...
Page 143: ...Sevcon Troubleshooting Page 3 Electrical Troubleshooting Identifying Your Controller...
Page 162: ...TAYLOR DUNN...
Page 185: ...Wire Diagrams...
Page 190: ...Illustrated Parts Parts Page 4 Steering Linkage...
Page 192: ...Illustrated Parts Parts Page 6 Steering Gear 4 1 6 8 7 5 9 10 2 3 14 17 12 11 13 15 16...
Page 194: ...Illustrated Parts Parts Page 8 Front Suspension...
Page 196: ...Illustrated Parts Parts Page 10 Transmission primary reduction...
Page 198: ...Illustrated Parts Parts Page 12 Transmission secondary reduction Rear Axle...
Page 200: ...Illustrated Parts Parts Page 14 Rear Brakes Front Brakes optional Brake Body...
Page 202: ...Illustrated Parts Parts Page 16 Rear Suspension...
Page 204: ...Illustrated Parts Parts Page 18 Motor...
Page 206: ...Illustrated Parts Parts Page 20 Deadman Seat Brake...
Page 214: ...Illustrated Parts Parts Page 28 Wheels and Tires Ref wheel hub 1 2 5 assembly 4 3 6 7 8 9 10...
Page 218: ...Illustrated Parts Parts Page 32 Speed Control Panel R 3 80 36 1 2 4 5 6 6 7 8 3 9 10 11 12 13...
Page 220: ...Illustrated Parts Parts Page 34 Miscellaneous Electrical Miscellaneous Frame...
Page 222: ...Illustrated Parts Parts Page 36 Seat Cushions and Lights 1 2 3 4 5 6 7 8 9...
Page 230: ...Illustrated Parts Parts Page 44 Batteries 36 Volt 48 Volt...
Page 232: ...Illustrated Parts Parts Page 46 Decals Front Cowl Tray Battery Compartment...
Page 234: ...Illustrated Parts Parts Page 48 Trailer Hitch...
Page 236: ...Illustrated Parts Parts Page 50 Strobe Light Other Front End Options...
Page 238: ...Illustrated Parts Parts Page 52 Cab Cowl With Windshield Options...
Page 240: ...Illustrated Parts Parts Page 54 Optional Cab Accessories...
Page 242: ...Illustrated Parts Parts Page 56 Cab Door Options...
Page 244: ...Illustrated Parts Parts Page 58 Optional Top Cover...
Page 246: ...Illustrated Parts Parts Page 60 Rear Seat Rear Gate and Rear Deck...
Page 248: ...Illustrated Parts Parts Page 62 9 Side Panels...
Page 250: ...Illustrated Parts Parts Page 64 Front Bumper and Splash Pan...
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