4-Speed Transmission - Datsun 620 Series 1977 Service Manual

Manual
Transmission
4
SPEED TRANSMISSION
TYPE
F4W71B
CONTENTS
DESCRIPTION
REMOVAL
DISASSEMBL
Y
TRANSMISSION CASE DISASSEMBLY
D ISASSEMBL
Y
OF
GEAR
ASSEMBLY
REAR EXTENSION
DISASSEMBLY
ADAPTER
PLATE DISASSEMBLY
INSPECTION
TRANSMISSION CASE
AND
REAR
EXTENSION
HOUSING
BEARING
GEARS AND SHAFTS
BAULK RING
Oil SEAL
ASSEMBL Y
FRONT COVER ASSEMBLY
REAR
EXTENSION ASSEMBLY
ADAPTER
PLATE ASSEMBLY
GEAR ASSEMBLY
TRANSMISSION ASSEMBLY
INSTALLATION
MT 2
MT 4
MT 4
MT 4
MT 5
MT B
MT 8
MT
8
MT B
MT 8
MT 8
MT 9
MT 9
MT 9
MT 9
MT 9
MT 9
MT 9
MT13
MT14
DESCRIPTION
pUshed
the inner teeth of the
coupling
sleeve slide
over
the synchronizer hub
and mesh
with
the
outer
teeth which
are
provided
on
the mainshaft gear
The
synchronizer
hub
is
fitted
to
the mainshaft by splines
so
the main
shaft
gear turns
together with the
mainshaft
The baulk
ring
serves
to
synchro
nile the
coupling
sleeve and mainshaft
gear
Placing
the control lever
in
reverse
position brings
the
reverse
idler gear
into mesh with mainshaft
reverse
gear
The transmission
is
of
a
4 speed
forward
fully
synchronized
constant
mesh type
that
uses
helical
gears
The
reverse
gear is ofa
sliding
mesh
type using spur gears
In
construction
the main drive
gear
is
meshed with the
counter
drive
gear
which
is
keyed
to
the countershaft
The forward speed
gears
on
the
coun
tershaft
are
in constant mesh with the
mainshaft
gears
which ride
on
the
mainshaft
freely
through the needle
bearing
When
shifting
is
accom
The transmission assembly consists
of three
main
parts
a
transmission
case
with clutch housing
adapter plate
to
which an
gears
and shafts
are
installed and
rear
extension
The
cast iron adapter plate
supports
the mainshaft countershaft
reverse
idler shaft and three fork rods and
bolted
at
the front
to
the transmission
case
and
at
the
rear
to
the
rear
extension
by
means
of
through
bolts
By removing these t h r o ugh bol t s all
gears and shafts
are
stripped
e
TM 858
1 Front
cover
2 Transmission
case
3
Adapter plate
4
Bearing
retainer
5 Rear extension
hOUsing
Fig MT 1 F4W71B lrammiasion
case
compon
nt
MT 2