freightliner BUSINESS CLASS M2 100, Руководство по обслуживанию

Страница: 181 / 198

Electrical Component
Inspection
1. Park the vehicle, apply the parking brakes, and
shut down the engine. Chock the tires.
2. Disconnect the batteries.
3. Inspect the condition of the electrical component.
Check for signs of excess dirt/debris build up on
or around component. If exterior cleaning is
needed for a thorough inspection, clean exterior
debris from the component using a dry method
such as a vacuum cleaner or using an electrical
contact cleaner such as CRC QD® Electronic
Cleaner.
4. Check all mounting points for loose, broken, or
missing parts. Component must be securely
mounted. All loose, broken, or missing parts
must be repaired to maintain proper component
function.
5. Inspect the component protective cover for
proper fit and function. Inspect cover for cracks,
broken mounting, missing sealing surfaces,
warped or bulged surfaces. The cover must pre-
vent moisture and debris from entering the com-
ponents protected area. Missing, leaking, or
damaged covers will result in moisture and de-
bris entering the component and will result in
component failure. When it is determined that a
cover has not properly prevented moisture and
debris from entering the component, the entire
component must be replaced.
6. Inspect component exterior for signs of thermal
distortion, warping, bulging, discoloration, amper-
age related heating, color variance or shading
across component which could be a sign of inter-
nal failure requiring replacement of the compo-
nent. The root source causing conditions of high
heat, excess amperage, and/or circuit overload
component failures must be diagnosed and re-
paired prior to replacing the component.
7. Inspect component housing sub-assembly clips
and fasteners for correct fit and location and that
component sub-assembly housing seams are
tight and secure. Missing, leaking, or damaged
component housings must be replaced.
8. Check main power cable connections for a clean
and secure fit. Connections should be free of
corrosion, dirt and moisture. Connections should
not have signs of thermal distortion, warping, dis-
coloration, high amperage heating or discoloring.
If needed, disconnect cables, scrub and clean as
needed using a nylon brush. Clean debris with
vacuum or electrical contact cleaner such as
CRC QD® Electronic Cleaner, inspect terminals
and mating contact terminal plating. If the termi-
nal plating exhibits signs of unrecoverable corro-
sion, the component and terminal will need re-
placed. Indications of unrecoverable corrosion on
terminal plating are:
•
Heavy staining that cannot be cleaned off
with nylon brush or contact cleaner;
•
erosion and pitting on terminal plating
causing uneven surfaces; or
•
discoloration caused by outer layer of plat-
ing being removed by corrosion or wear
exposing the under layer material of termi-
nal.
9. Check all electrical connectors for correct fit and
that the connector locking tabs are in place and
will hold the connector firmly into the component.
Inspect connector terminals for signs of corro-
sion, thermal distortion, warping, discoloration,
high amperage heating or discoloring. If needed,
remove connectors and terminals, scrub and
clean as needed using a nylon brush. Clean de-
bris with vacuum or electrical contact cleaner
such as CRC QD® Electronic Cleaner, inspect
terminals and mating contact terminal plating. If
the terminal plating exhibits signs of unrecover-
able corrosion, the component and terminal will
need to be replaced.
10. Inspect sealed harness connectors for presence
of connector housing seals and connector pin
seals designed to keep moisture and debris from
entering the connector and component. Missing,
leaking, or damaged seals will result in moisture
and debris entering the connection and the com-
ponent and will result in component failure.
When it is determined that connector seals have
not properly prevented moisture and debris from
entering the component, the entire component
must be replaced.
11. Inspect component harnesses for secured rout-
ing that prevents excess harness movement and
prevents the harness from pulling too tight on the
connector. Inspect harnesses for signs of rubbing
or chafing that could result in wire circuit dam-
age. Damaged wiring and/or damage to harness
Electrical, Instruments, and Controls
54
Business Class M2 Maintenance Manual,
54/1