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PART
7·3- F. M.X. AUTOMATIC TRANSMISSION
7-95
GOVERNOR
I.
Inspect the governor valves and
bores for
scores.
Minor scores may
be removed from the valves with
crocus cloth. Replace the governor
if the valves or body is deeply scored.
2. Check for free movement of
the valves in the bores. The valves
should slide freely of their own
weight in the bores when dry.
In-
spect fluid passages in the valve body
and counterweight for
obstructions.
All fluid passages must be clean.
3. Check the mating surface of the
governor.
valve and the counter-
weight for burrs or scratches.
FRONT SERVO
I.
Inspect
the
servo
bore
for
cracks and the piston bore and the
servo piston stem for
scores.
Check
fluid passages for
obstructions.
Re-
place seals that are damaged.
2. Check the actuating lever for
free movement, and inspect it for
IJ
DESCRIPTION
DESCRIPTION
Figure 22 shows the location of
the converter, front pump, clutches,
bands, gear train and most of the
internal parts used in the FMX
Transmission.
The identification tag (Fig. 23) on
an F MX transmission is attached
under the lower right-hand extension
to case bolt. The tag includes the
model prefix and suffix, assembly
part number and the build date code.
The tag must be kept with the
individual transmission it was origin-
ally installed on. If the tag was
removed during disassembly, re-
install it on the same unit.
The FMX transmission is a three
speed unit capable of providing auto-
matic upshifts and downshifts through
the three forward gear ratios, and also
capable of providing manual selection
of first and second
gears.
The transmission consists essentially
of a torque converter, planetary gear
train, two multiple disc clutches and a
hydraulic control system
(Fig.
24).
OPERATION
TORQUE: CONVERTER
The
hydraulic torque converter
wear. If necessary to replace the
actuating lever or shaft, remove the
retaining pin and push the shaft out
of the bracket. Inspect the adjusting
screw threads and the threads in the
lever for damage.
3. Check the servo spring and servo
band strut(s) for distortion.
4. Inspect the cover seal and gas-
ket cover sealing surface for defects.
REAR SERVO
I. Inspect
the
servo
body
for
cracks
and
the
piston
bore
for
scores.
2. Check the fluid passages for
obstructions.
3. Inspect the band and the struts
for distortion
.
Inspect the band ends
for cracks.
4. Inspect the servo spring for
distortion.
S. Inspect the band lining for ex-
cessive wear and bonding to the
metal band.
6. Check the servo body to case
mating surface for burrs. Check the
(Fig. 25) consists of an impeller
(pump), a turbine, and a stator. All
these parts are enclosed and operate
in a fluid-filled housing.
When the engine is running, the
fluid in the torque converter flows
from the impeller to the turbine and
back to the impeller through the
stator.
This flow produces a max-
imum torque increase of about 2 to
I when the turbine is stalled. When
enough torque is developed by the
impeller,
the turbine begins to rotate,
turning the turbine shaft.
The converter torque multiplica-
tion gradually tapers off as turbine
speed approaches impeller speed, and
it becomes I to I when the turbine is
being driven at 9110 impeller
speed.
This is known as the coupling point.
When the turbine is rotating at less
than 9
I
10 impeller speed, the convert-
er is multiplying
torque.
The fluid
leaving the turbine blades strikes the
front face of the stator blades. These
blades are held stationary by the ac-
tion of a one-way clutch (Fig. 25) as
long as the fluid is directed against
the front face of the blades.
When the turbine rotates faster
than 9
I
I 0 impeller speed the convert-
er no longer multiplies torque. The
fluid is directed against the back face
of the stator blades. As the one-way
accumulator piston and the check
valve for freedom of movement.
Check the actuating lever socket for
scores.
7. Replace seals that are damaged.
CASE:
Inspect the case for cracks and
stripped threads. Inspect the gasket
surfaces and
mating surfaces for
burrs. Check the vent for obstruc-
tions, and check all fluid passages
for obstructions and leakages (Fig.
9).
Inspect
the
case
bushing
for
scores. Check all parking linkage
parts for wear or damage.
ONE:-W A Y CLUTCH
I. Inspect the outer and inner
races for scores or damaged surface
area where the rollers contact the
races.
2. Inspect the rollers and springs
for excessive wear or damage.
3. Inspect the spring and roller
case for bent or damaged spring re-
tainers.
clutch permits the stator to rotate
only in the direction of impeller ro-
tation, the stator begins to turn with
the impeller and turbine. The convert-
er operates as an efficient fluid cou-
pling as long as the turbine speed
remains greater than 9
I
10 impeller
speed.
A constant flow of fluid into and
out of the converter is maintained.
Some of the fluid coming out of the
converter is forced through a cooler
located in the radiator tank.
PLANETARY GEAR TRAIN,
CLUTCHES, BANDS AND
SERVOS
Planetary Gear Train
The planetary gear train consists
of a primary sun gear, secondary sun
gear, primary and secondary pin-
ions which are held in a common car-
rier, and an internal gear to which
the transmission output shaft is at-
tached (Fig. 26).
Front Clutch
The front clutch drive plates (Fig.
27)are connected to the turbine shaft
through the front clutch
drum.
The
driven plates are connected to the
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