Section 6. Component Procedures
Toyota Model 7HBW23 Service Manual
Motors, General 4. If the meter indicates high resistance in the armature, check the condition of the brushes before replacing the motor.
2. With the motor at room temperature, connect the leads of a digital ohmmeter between the individual circuits in the motor.
5. If an open circuit is found in a compound motor, the motor must be disassembled by a motor rebuilding facility to isolate the problem to the field or armature circuit.
3. Observe the measurements given in Table 6-2. Table 6-2: Motor Resistance Readings
Motor Traction (Drive)
Lift
Acceptable Resistance Readings
Terminals
Unacceptable Resistance Readings
Armature
A1 to A2
0.01 to 0.10 ohms
Greater than 0.10 ohms
Field
E1 to E2 (S1 to S2)
0.8 to 1.7 ohms
Less than 0.5 ohms or Greater than 2.0 ohms
A to S
0.020 to 0.030 ohms
Greater than 0.1 ohms
NOTE: Measure all readings at room temperature. See Figure 6-38 on page 6-39.
6-40
00700-CL340-05, Issued: 2 May 2005
