Crown RC 5500 series - Motors; Pump Motor and Brush Inspection

209
M4.7-1055-001
ELECTRICAL
Motors
Motors
This truck is equipped with a left and a right AC motor
that provide traction, and a DC motor that powers the
hydraulic pump. The traction motors have ECR1/ECR2
sensors to monitor speed and position. The ECR1 is
internal in the right hand motor, the ECR2 in the left.
The standard hydraulic pump motor is DC, with AC be-
ing optional. Pump motor has ECR4 to monitor pump
direction and speed. This is internal to the motor.
Refer to Section M6.2 for information regarding the
steer motor.
Check motor for shorts between terminals and motor
frame by use of an ohmmeter on a high resistance
scale such as R x 10,000. If a reading of less than
50,000 ohms is observed, the source of trouble should
be repaired before unit is placed into operation to pre-
vent further damage.
Pump Motor and Brush Inspection
1. Disconnect battery.
2. Remove the hydraulic unit mounting bolts and tilt
unit just enough to access top of motor. Remove
headband and commutator end head.
3. Clean brush band area and remove brush band.
4. Clean dirt and carbon dust from winding and brush
holder with low pressure air. Use a clean, dry cloth
to clean commutator. (Do not use emery cloth.)
5. Brushes should be replaced when they reach a
length of 10 mm (0.375 in) or will reach that length
before the next scheduled inspection.
6. Check brush springs to see they maintain tension
against the commutator equally on all brushes.
Chart 1 - Motor Information
Motor
Function
Traction Traction - EE Hydraulic Hydraulic Hydraulic - EE
Part Number 021084 021184 021122 021099 021185
Motor Type AC Induction AC Induction AC Induction DC AC Induction
Voltage 36 36 36 36 36
Rated
Output kW (HP)
4.8 (6.43) N/A 7.9 (10.59) 7.9 (10.59) 7.9 (10.59)
RPM 1690 1690 1600 2465 1600
Direction of
Rotation
Bi-Directional Bi-Directional CCW CCW CCW
Motor Diameter
mm (in)
190.5 (7.5) 190.5 (7.5) 190.5 (7.5) 170.18 (6.7) 190.5 (7.5)
Number of
Brushes
N/A N/A N/A 4 N/A
Internal
Sensors
ECR1/ECR2 ECR1/ECR2 ECR4 ECR4 ECR4
Crown 2007 PF15715-1