Sevcon Troubleshooting
Page 7
Electrical Troubleshooting
Test 2. TESTING THE MOTOR
Disconnect both of the battery leads during any maintenance or
before disconnecting any electrical component or wire. Failure to do
so may cause property damage and/or serious bodily injury.
NOTE: Special and expensive motor testing equipment is required in order to accurately measure motor armature
or field resistance. In most cases, this equipment is not required in order to determine if a motor is faulty.
The majority of motor failures are due to an open circuit in the field or armature windings. If the symptom
of the vehicle is “not running with NO motor current” then a simple continuity test of each winding is all
that is required to determine if the motor is at fault.
TEST 2.1:
Check the motor field continuity from the motor
F1 to the motor F2 terminals.
If the resistance is close to values given in
the motor specification table, then skip
ahead to test #2.2. (The motor specification
table can be found in the “Motor Service”
section).
If the test indicates an open circuit, then
repair or replace the motor.
Test continuity from F1 to the frame of the motor.
Any reading other than an open circuit
indicates a short in the motor.
Stop trouble shooting here and repair the
problem. When the repair is completed,
completely retest the vehicle before lowering
the drive wheels to the ground.
STOP
TEST 2.2:
Check the continuity from the motor A1 to the A2
terminals.
If the resistance is close to values given in
the motor specification table, then go to test
#2.3.
If the test indicates high resistance or an
open circuit, then repair or replace the motor.
Stop trouble shooting here and repair the
problem. When the repair is completed,
completely retest the vehicle before lowering
the drive wheels to the ground.
STOP
1. Make sure the key-switch is in the “OFF” position, then remove the key.
2. Place the forward-reverse switch in the center “OFF” position.
3. Set the park brake.
4. Place blocks under the front wheels to prevent vehicle movement.
Motor shown in illustrations is typical of a standard motor.
The terminal configuration of your motor may be different.
Summary of Contents for B0-248-36
Page 2: ......
Page 6: ...TAYLOR DUNN...
Page 76: ...Maintenance Service and Repair Steering Page 22 Exploded View of Steering Gear...
Page 102: ...TAYLOR DUNN...
Page 138: ...TAYLOR DUNN...
Page 144: ...TAYLOR DUNN...
Page 156: ...TAYLOR DUNN...
Page 159: ...Sevcon Troubleshooting Page 3 Electrical Troubleshooting Identifying Your Controller...
Page 178: ...TAYLOR DUNN...
Page 210: ...Illustrated Parts Parts Page 2 Part number not available at time of printing Front Axle...
Page 212: ...Illustrated Parts Parts Page 4 Part number not available at time of printing Steering Knuckle...
Page 214: ...Illustrated Parts Parts Page 6 Part number not available at time of printing Front Brakes...
Page 216: ...Illustrated Parts Parts Page 8 Part number not available at time of printing Steering Linkage...
Page 228: ...Illustrated Parts Parts Page 20 Part number not available at time of printing Rear Brakes...
Page 230: ...Illustrated Parts Parts Page 22 Part number not available at time of printing Brake linkage...
Page 234: ...Illustrated Parts Parts Page 26 Part number not available at time of printing Motor...
Page 278: ...Illustrated Parts Parts Page 70 Part number not available at time of printing Hitches...
Page 279: ...Illustrated Parts Parts Page 71 Part number not available at time of printing...
Page 280: ...Illustrated Parts Parts Page 72 Part number not available at time of printing...
Page 281: ...APPENDIX A Special Tools...
Page 290: ...Model B 1 00...
Page 291: ......