Table of Contents
Advertisement
204
FIAT· 850 PASSENGER CARS
Shorted, Grounded or Open Armature
Coil.
If
the armature
winding
is damaged,
it
cannot be
repaired through replacement of shorted. broken
or grounded turns.
As a matter of fact coils are made of a copper
wire coated
with
special insulating material
(vinyl
acetate) and require. for winding. soldering, im-
pregnation, etc., a special treatment and equipment
covered
by
suitable Process Standards, which are
only available at specialized workshops.
Therefore, the armature should be renewed as
an assembly.
Replacing Brushes.
Only genuine FlAT brushes must be used for
replacement.
Brushes
with
different hardness or
composition characteristics would impair commu-
tator life and affect generator and regulator oper-
ation adversely.
The use of unsuitable brushes determines poor
commutation, followed
by
accelerated wear rate
of commutator segments and brushes, remarkable
voltage drops between commutator and brushes
and a marked excitation current increase.
Overhaul.
Irrespective of the repair or replacements ef-
fected, before reassembling the generator:
a) blow
all
carbon dust from components;
b) with a
dry
rag, clean brush holders and
commutator end head (rom
all
grease and carbon
dust;
c) with a
dry
rag, clean commutator, especially
between segments.
Do not use emery cloth or sand paper, or even
cloths soaked in oil, gasoline or solvents of any kind;
d) with FIAT
J
ota 3 grease, pack ball bearing
and pocket at the end of commutator end head
bushing and, with FIAT VE oil,
fill
up the commu-
tator end head oiler.
NOTE. Do not lubricate generator bearings with
greases of any different kind.
Assemble generator by reversing disassembly
procedure.
Repeat operation checks as per _Bench Testing
$.
3
5)-__- - - -..
4
2
Fig. 326 • Components of 0 90/12/16/3 CS genera10r.
1. Field frame .• 2. Commutator end head.• 3. Drive end head.• 4. Armature. - 5. Thru-bolls.
Advertisement
Table of Contents
