Mooney M20K - Battery Maintenance

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE
MANUAL
(3)
Position
engine
hoist
to
hold
engine
in
position.
4.
STANDBY
GENERATOR
MAINTENANCE
(4)
Loosen
lower
engine
mount~firewall
bolts
(259001
thru
25-0999).
slightly
so
engine
mount
can
pivot.
The
standby
generator
brushes
should
be
replaced
at
(5)
Lower
engine
hoist
to
allow
engine
to
pivot
150
to
200
hours
of
operation
under
load.
The
downward
just
enough
to
permit
altematorto
be
removed.
generator
manufacturer
recommends
the
brushes
be
replaced
every
2000
hours
of
no
load
operation.
(6)
Remove
cooling
air
duct
and
any
wiring
form
Mooney
AircFaff
Corporation
recommends
the
generator
alternator,
connections,
brushes
and
general
conditions
be
B.
Altemator(s)
Installation.
inspected every
100
hours
and
repaired
if
necessary.
Refer
to
vendor
overhaul
manual
for
specific
Main,
Gear
Dn’ven,
LowerAltemator
maintenance
procedures.
Minimum
brush
length
is
.700
(1)
Place
new
attemator
into
position
on
drive
pad.
inch
overall.
Replace
with
new brushes;
minimum
spnng
(2)
Attach
cooling
air
duct
and
widng
to
alternator.
tension
on
new
brushes
should
be
5
ounces.
(3)
install
mounting
bolts
into
accessory
case
2431-02
-VOLTAGE
REGULATOR
dn’ve
pads
and
secure
alternator.
Use
standard
torque
MAINTENANCE
table
fn
Chapter
5.
The
battery
charging
rate
depends
upon
the
battery
(4~ Raise
engine
hoist
to
position
upper
engine
condition
and
the
voltage
regulator
setting.
Wnh
all
mouni/fiiewall
attach
points
and
secure
with
engine
equipment
turned
off and
the
engine
running
at
2000
mount
bolts.
RPM
or
faster,
the
normal
battery
charging
rate
will
be
5 to
35
amperes.
(5)
Torque
upper
and lower
engine
mount/firewall
boist
per
Section
71-00-30.
1.Ej(cessively
High
Charging
Rate.
Check
the
following:
(6)
Reposition
any
components
moved
dun’ng
A.
Fly
aircraft
for
15
to
20
minutes;
charging
rate
altematbr
removal
process.
should
slowly
drop
to
10
amperes
or
less.
A
very
low
battery
will
take
longerto
show a
drop
in
charging
current.
Belt
Dn’ven
Alternator
B.
Measure
voltage
with a
voltmeter
connected
to
(1)
Place
ne\N
alternator
on
iower
pivot
attach
point
the
bus. At
800
F.,
voltage
should
be
13.75
to
14.0
(2)
Insert
pivot
point
mounting
hardware.
(25-0001
thru
25-0999),
(S/N
25-1000
8
01\/27.5
to
28.0
volts).
An
excessively
high
voltage
regulator
(3)
Re-attach
win’ng
and
cooling
air
duct
to
setting
will
cause
excessive
battery
heating
and
water
alternator,
loss.
(4)
Place
drive
belt
over
altemator
pulley.
Make
2~
Excessively
Low
Charging
Rate.
Check
battery
sure
b~oih
drive
sheave
and
altemator
pulley
are
properfy
charging
rate
(normal
rate
is
not
to
exceed
four
aligned
so
belt
will travel
in
straight
line.
Use
Burrough
amperes).
The
regulator
should
not
be
considered
Tool
#8082.
Reposition
AN960-716
washers
on
bottom
defective
because
of
a
low
charing
rate
until:
bolt and
add
TCM
#849268
washers
for
alignment.
A. A
voltmeter
check
indicates
that
voltage
at
the
(5)
Position
altemator
to
obtain
proper
belt
b,s is
below
requirements.
tension
45-501bs..
B. A
battery
hydrometer
check
indicates
that
(6)
Tighten
tension
adjustment
hardware
to
battery
is not
fully
charged.
standard
torque
tables
in
Chapter
5.
3.
Hydrometer
Reading.
If
battery
eledrolyte
O
Run
engine
with aftemator
loaded,
minimum
temperature
is
below
800
F.,
subtract
four
points
from
of
20
minutes,
maximum
of 2.0
hours,
then
retension
hydrometer
reading
for
every
100
F.
below
800
F.
If
belt
45
50
Ibs.
battery
acid
temperature
is
above
800
F.,
add
four
points
to
hydrometer
reading
for
every
100
F.
above
800
F
U(AMPLE:
Hydrometer
reading
1.260
Battery
electrolyte temoerature
300
F.
80"-
300
500
5 x4
20
points
Corrected
readina
1260
-20~
HYDROMETER
READlNG
PERCENT
OF
CHARGE
1.280
100
1.250
75
1.220
50
1.190
25
1.130
or
below
Very
little
useful
capacity-discharged
24-31-02
OLDWILLWAYNE