MAINTENANCE OF THE M113 PER CARRIER - OD1601 LESSON 1/TASK 1
(10) Battery Leads. Three leads are connected to the batteries; one is attached
to the negative pole for ground, one to connect the batteries in series (negative
pole to positive pole), and one connected from the positive pole to the master
switch. In the M113A1, the lead attached to the positive pole runs along the right
sponson, crosses over above the powerplant compartment access panel, and connects
to the master switch.
(11) Rear Main Wiring Harness (all carriers except the M577A1).
The rear main
wiring harness interconnects with the instrument wiring harness and supplies power
to the left and right stoplight taillights, fuel quantity transmitter, trailer
light wiring harness, rear bilge pump, utility outlet, bilge pump circuit breakers
in the distribution box, personnel and engine coolant heaters wiring harness,
personnel and engine coolant heater fuel pump. The wiring harness has leads to two
dome lights on the M113A1 carrier.
(12) Instrument Panel Wiring Harness.
The instrument panel wiring harness
interconnects with the front main wiring harness, rear main wiring harness, and
instrument panel.
(13) Trailer Light Wiring Harness. The trailer light wiring harness interconnects
with the rear main wiring harness.
The connector mounts on the exterior of the
ramp, with a protective cover over the connector.
When the trailer is in tow,
power can be supplied to it by connecting the harness from the trailer to the
connector mounted on the ramp.
d. Pivot Steer Brake Assembly. The pivot steer brake assembly and master cylinder
are major components of the pivot steer system installed in the M113 carrier. The
brake assembly consists of two separate housings, each containing a release unit
and a brake lining. In a carrier pivot steer system, the two housings are mounted
together on an output flange (left or right) of the steering control differential
so that the pivot steer brake disk rotates in a gap between the two housings. When
hydraulic pressure is applied to the brake assembly from the manually actuated
brake cylinder, the release unit in each housing simultaneously causes the brake
lining to press against opposite sides of the brake disk and bring its rotation,
and that of the differential output shaft, to a stop.
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