Columbia ParCar Expediter EX21-24A, Service Manual

Page: 94 / 94

Section 10 – Traction Drive System
(5.7
– 6.8 Nm).
4. Reconnect battery negative cable. Insert Power key in
switch and check for steady green light on controller.
5.
Perform an operational check of the vehicle’s driving
abilities
CONTACTOR/SOLENOID
Contactor is an electro-magnetic switch that energizes when
current is applied to the small control circuit terminals. When
energized, the solenoid core moves up from magnetism
created by the coil and internal contacts, creating a connection
between two large terminals, allowing current to pass through.
When control circuit voltage is removed from the small
terminals, the magnetic field collapses and a spring returns the
core to its rest position. A contact solenoid in the normal
position has an open circuit between the large terminals,
preventing current from passing through it.
Solenoids are mounted in vertical position. Gravitational pull
aids internal spring in returning to normal position.
REMOVING
1. Label contactor cables with terminal identification. Refer to
schematic for correct wire numbers.
2. Remove two nuts, washers and cables from stud terminals
(Figure 10-21 circle).
3. Remove control circuit wires from spade terminals which
are located below the stud terminals.
4. Remove two nuts, washers, bolts and contactor (Figure 10-
21 arrow).
I
NSTALLING
1. Position new contactor to mounting bracket.
2. Secure contactor to mounting plate with two bolts, nuts and
washers.
3. Install control circuit wires to spade terminal. Install heavy
cables to stud terminals. Double check wiring diagram to
ensure connections are correct.
4. Operational Check: Contactor should emit an audible click
when the power key switch is set to ON position.
Figure 10-21