EP Equipment EPT20-15ET, Руководство по обслуживанию

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41
REV. 09/2016
DRIVE SYSTEM
5
5.4 Drive Motor
This truck obtains drive force through DC motor.
5.4.1 Removal and Installation
Drive Motor
-
-
Unscrew the three screws (1) and remove
motor end cover (2) ;
Unscrew the two screws (5) and remove the
carbon brush (7) on the holder (6).
See Section 5.3.1 .
Carbon Brush
-
Install according to the reverse order of rem-
oval.
When replacing the carbon brush, replace the
complete set of carbon brushes.
CAUTION
Due to magnetic force, the rotor and the stator
may pull each other, therefore, when disman-
tling motor rotor, do not hold your hand between
the rotor and the stator to avoid pinch hazard!
WARNING
-
After replacing the motor or carbon brush,
conduction test must be carried out to the
motor (see Section 5.4.3).
Adjustment
-
After replacing carbon brush, running opera-
tion must be carried out to the carbon brush:
By running the motor with repeated lifting,
letting the carbon brush to be fully running,
making its surface smooth to
fi t the rotor.
5.4.2 Faults and Causes
1
Fault Motor does not rotate
Cause
a. Negative electrode cable
broken;
b. Motor positive and negative
electrode with loose terminals;
c. Armature winding with broken
circuits;
d. Motor bearing damaged and
blocked;
e. Serious wearing of carbon
brush.
2
Fault Motor speed is turning slow
Cause
a. Insuf fi cient voltage of battery;
b. Carbon brush worn or carbon
brush spring pressure
decreases;
c. Bearing wear or lack of
lubricating oil;
d. Armature winding has short
circuit elements;
e. Carbon brush winding grounded.
3
Fault
Motor sometimes can start,
sometimes cannot
Cause
a. Motor positive and negative
electrode with loose terminals
and poor connection;
b. Carbon brush wear and tear;
c. Armature winding has circuit
broken unit.
4
Fault
Motor with abnormal noise or
vibration
Cause
a. Uneven clearance between
stator and rotor;
b. Bearing failures;
c. Loosening
fi xing screws on
motor housing.