
128 SEBU8219-01
Maintenance Section
W ater Pump - Inspect
A visual inspec
tion should be initially directed at
the areas that are most prone to damage and
deterioration. The most prone areas to damage and
deterioratio
n are listed below:
Ground insulation – Ground insulation is insulation
that is inten
ded to isolate components that are
carrying current from components that are not
carrying current.
Support insulation – Support insulation is usually
made from one of the following items: a compressed
lamination o
f fibrous materials, polyester, or felt pads
that have been impregnated with various types of
bonding agents.
There are many different types of damage that can
occur in these areas. Several of the different types of
damage are l
isted below:
Thermal aging – Thermal aging can cause the
degradati
on of insulation or the deterioration of
insulation. An examination of the coils may reveal
that the insulation has expanded into the ventilation
ducts. Thi
sistheresultofalossofbondwhich
will cause the insulation material to separate. The
insulation material could also separate from the
conducto
rs on the windings.
Abrasion – The surfaces of coils and the surfaces
of connec
tors may be damaged by abrasion. These
surfaces may also be damaged by contamination
from other sources. An example of these sources
would be c
hemicals or abrasive substances.
Cracking – Cracking of insulation may result from
mechani
cal stress. The structure that is used to brace
the stator winding will become loose if the problem
is not corrected. Further mechanical damage or
electri
cal damage may also result.
Erosion – Erosion can be caused when foreign
substan
ces rub against the insulation that is on the
surface of the coil .
i01057943
Water Pump - Insp ect
SMCS Co
de: 1361-040
A failed water pump might cause severe engine
overhe
ating problems that could result in the following
conditions:
•
Cracks
in the cylinder head
•
Apistonseizure
•
Other potential damage to the engine
Visually inspe
ct the water pump for leaks. If any
leaking is observed, replace the water pump seal
or the water pump assembly. Refer to the Service
Manual for the
disassembly and assembly procedure.
Note: Refer to the Service Manual or consult your
Caterpillar
dealer if any repair is needed or any
replacement is needed.
i01787397
Winding - Tes
t
SMCS Code: 4453-081; 4454-081; 4457-081;
4470-081
g00677
004
Illustration 90
PMPE Generator W iring Diagram
(CR1-CR
6) Diodes
(CR7) Va
ristor
(L1) Exc
iter field (s tator)
(L2) Exc
iter armature (rotor)
(L3) Mai
n fiel d (rotor)
(L4) M ain
armature (stator)
(L5) Pilo
t exciter armature
(PM) Pe rm
anent magn et
(RFA) Rot
ating field assem bly
(CST) Cu s
tomer s upplied transformer