check DATSUN PICK-UP 1977 Service Manual

f

BR317

Fig
BR
23

Gre
ing
point

4

Tightening

torque

Wheel

cylinder

J
S
to
1

8

kg
m

II
to

13ft
Ib

Connector
bolt

1

9
to
2
5

kg
m

14
to
18
ft
Ib

Brake
tube

1
5
to
1

8

kg
m

II

to
13

ft
Ib

Air
bleeder

0
7
to
0
9

kg
m

S

to
7
ft
Ib

Brake
disc

5
4

to
6
4

kg
m

39
to
46
ft

Ib

S

Adjust
brake
shoe
clearance
and

bleed
brake

system
Upon
completion

of

the
above

adjustments
make
sure

that
brake

operates
correctly
and
no

brake
fluid
leaks

MASTER
VAC

DESCRIPTION

A
vacuum

suspended
Master
Vac

is

installed
behind
the

master

cylinder

As
the

brake

pedal
is

depressed
fluid

is

forced
under

high
pressure
through

the
brake

pipes
to
the
wheel

cylinders

to
retard

or

stop
the

vehicle

The
Master
Vac
contains

a

spring

loaded

diaphragm
of
IS2
4

mm
6
in

in

diameter
It

operates
on

negative

pressure

produced
n
the

engine
intake

manifold

The
tandem

master

cylinder
is

capable
of

producing
high
pressure

even
if
the
Master
Vac
is

faulty
Brake

System

Note
The
Master
Vac

diaphragm
dif

fers
from
fonner
ones
for

improved

braking
force
Do
not
install
fonner

Master
Vac
on
1976
models
The

1

Plate
and
seal

2
Push
rod

3

Diaphragm

4

Rear
shell

5

Diaphragm

plate
Master
Vacs

are
identified

by
the

label
color
as
follows

1976
model
Caution

Label

Former
models
YeJlow

BR321

11

Valve

operating
rod

12
Valve

return

spring

13

Poppet
return

spring

14
Exhaust
valve

15
Valve

plunger

16
Reaction

disc

17

Diaphragm
return

spring

18
Front
shell
6
Seal

7

Vacuum
valve

8

Poppet
assembly

9
Valve

body
guard

10
Air

silencer
filter

INSPECTION
OF

OPERATION

Checking
yscuum

pressure

I
Connect

a
vacuum

gauge
in
the

line
between
check
valve

and
Master

2
Start

engine
and
increase

engine

speed
Stop
engine
when
vacuum

gauge
indicates
SOO

mmHg
19
69

inHg

BR
14
Fig
BR
24
Sectionall1iew

of
Master
Vac

Vac
as

shown
in

Figure
BR
25

1

Check
valve

2

Vacuum

gauge

BA169

Fig
BR

25
Air

tight
t
t
t

up

Air

tight
test

I
Fifteen

seconds
after

engine
is

stopped
observe
the

rate
of

drop
in
air

pressure
registered
by
vacuum

gauge

If
a

pressure
drop
of
25

mmHg
0
98

inHg
is

exceeded
refer
to
the
follow

ing
chart
to
determine
the
cause
of

failure

Probable
cause

I
Air

leakago
at
check
valve

2
Air

leakage
a

t

push
rod
seal

3

Air
leakage
between
valve

body
and

seal

4
Air

leakage
at
valve

plunger
seat

5

Damaged
piping
or

joints

2
Fifteen

seconds
after

engine
is

stopped
and
brake

fully
applied
ob

serve
the

rate
of

drop
in
air

pressure

registered
by
vacuum

gauge

Probable
cause

1
Air

leakage
at
check
valve

2

Damaged
diaphragm

3
Reaction
disc

dropped
off

4
Air

leakage
at

and
valve
body
poppet
assembly
seat

Note
When

replacement
of

any
part

is

required
be
sure
to
renew

Master

Vac
as
an

assembly

Inspecting
check
valve

Remove

clip
and
disconnect
hoses

at
connections

The
check
valve

can

now
be
removed

yr

BA3

Fig
BR
26
Location

of
check
valve

2

Using
a
Master

Vac
tester

apply
a

vacuum

pressure
of

200

mmHg
7
87

inHg
to

the

port
of
check

valve
on
the

Master
Vac
side
If
a

pressure
drop
of

10

mmHg
0
39

inHg
is
exceeded
in
1

I

I

17
I

f
I

I
I

Z
I

I
y1
I

I
I
7
I
I
I

I
I
I

I
I
I

I

y1
II

I

I
I
I
I
I

I
L
I
L

5
to
15

20
25
30
35
40

45
50

55
60

22
44

66

88
110
132

Pedal

operating
force

kg
lb
BR772

Fig
BR
28

Performance
curves

of
Master
Vac
Brake

System

Corrective
action

Replace
check
valve

Replace
seal

Repair
or

replace
faulty

partes

Repair
or

replace
seat

Repair
or

replace

If
a

pressure
drop
of
25

mmHg

0

98

inHg
is

exceeded
refer
to

the

following
chart
to
determine
the
cause

of

failure

Corrective
action

Replace
check
valve

Replace

Reinstall
and
check

push
rod

for

proper
turn

Replace

faulty
part
s

15
seconds

replace
check
valve
with
a

new
one

3
When

pressure
is

applied
to
the

Master
Vac
side
of
check

valve
and

valve
does
not

open
replace
check

valve
with
a

new
one

120
I

7IG

110
1
560

100

I
420

i
90
1
280

I

u

80
1
140

70
1
000

II

60
850

0

0

5

a
50
710

40
570

30
430

20
280

10
140

BR
15
1

I

Manifold

side

Master

Yac
side

1

Spring
2

Valve

BA289

Fig
BR

27
Sectional
view

of
check

valve

Operating
test

1
Connect

an
oil

pressure
gauge
in

brake
line

at
connection
on
master

cylinder

2
Install
a

spring
scale
on
brake

pedal

3

Start

engine
and
increase

engine

speed
until

a
vacuum

pressure
of
500

mmHg
19
69

inHg
is

registered
on

vacuum

pressure

gauge
With
a

vacuum

pressure
of
500

mmHg
19
69

inHg

held

measure
an
oil

pressure
with

respect
to

each

pedal

operating
force

Relationship
between
oil

pressure

and

pedal

operating
force
is
illustrated

in

Figure
BR
28
If

test
results
are
not

as

specified
in

Figure
BR
28
check

Master
Vac
for
condition
in

a
manner

as
described
under

Inspection
before

removal
of
this
unit

Also
check
brake
line
for
evidence

of
fluid

leakage

Note
Determine
whether
malfunc

tion
occurs
in
Master
Vac
or
in

check
valve

Always
inspect
check

valve
fiTlit

BA1Bl

Fig
BR
36

Remouing
ualue

operating

rod

assembly

4

Withdraw
reaction

disc

BA286

Fig
BR
37

Remouing
reaction
disc

Front

shell
seal

I

Detach

flange
from

front
shell

assembly

BR287
g

Fig
BR
38

Removing

lange

2

Withdraw
front
seal

assembly

INSPECTION

I
Check

poppet
assembly
for
condi

tion
If
it

shows
evidence
of

wear
or

damage

replace
it

and
valve

operating

rod

assembly

2
Check
other

component
parts
for

condition
If

any

part
shows
evidence

of
wear
or

damage
replace
it
with

a

new
one
Brake

System

ASSEMBLY
AND

ADJUSTMENT

Assemble
in
the

reverse

sequence
of

disassembly

Rear
shell

seal

1

Apply
a

coating
of

Master
Vac

grease
to

the

sealing
surface
and

lip
of

seal
and

install
that
seal
in

rear
shell

with
the

use
of

Master
Vac
Oil
Seal

Retainer
Drift

ST08060000

Fig
BR
39

Installing
oil
seal

Note

Referring
to

Figure
BR
40
in

stall
seal
in

place

by
properly

aligning
the

pawl
of

special
tool

with

seal
hole

Adjustment
is
cor

rect
when

specified
length
at

A
is

obtained

Length
A

6
7
to
7
Omm

0
264
to
0

276
in

BA1S5

Fig
BR
40

Length
at
A

Diaphragm
plate

I

Apply
a
thin

coating
of

grease
to

the

sliding
contact

portion
on
the

periphery
of

plunger
assembly

BR
17
1

SR1S6

Fig
BR

41

Requiring

grease
place

2

Install

plunger
assembly
and

silencer
in

diaphragm
plate
and

lightly

push

plunger

stop
key
in

place

Note

Diaphragm

plate
is
made
of

bakelite
Exercise

care
in

instaJJing

plunger
assembly
not
to

damage

diaphragm
plate

BROB3

Fig
BR
42

Inserting
stop
key

3
Before

installing

diaphragm
into

position
apply
a
thin

coating
of
mica

power
to
it

except
outer
diameter

and

seating
portion
with
which
shell
comes

into

contact

4
Before

installing
reaction
disc
in

place
on

diaphragm
plate
apply
a
thin

coating
of
Master
Vac

grease

Front
shell

seal

Before

installing
front

shell
seal
as

sembly

apply
a

coating
of
Master
Vac

grease
to
the
inner
wall
of
seal
and

front

sheU
with
which
seal

comes
into

contact

Final

sssembly

Apply
thin

coating
of
Master
Vac

grease
to
the
outer

edges
of

diaphragm

with
which

rear
and
front
shells

come

into
contact
before

instaIling
dia

phragm
in

position

2
Before

installing
push
rod
assem

bly
in

place

apply
a

coating
of

Master
Vac

grease
to
the

sliding
con

tact
surface
of

diaphragm
plate

1
Control
bracket

2
Control
lever

3
Control
stem

4
Front

cable

5

Balance
lever

6
Rear
cable
R
H

7

Rear
cable
L
H

REMOVAL

Control
stem

I

Disconnect

terminal
from
hand

brake

warning
switch

2

Remove
nuts

securing
control

bracket
in

place
on
dash

panel
Brake

System

BAS6l

Fig
BR

46
Hand
brake

linkage

3

Pull
out
lock

pin
and
colter

pin

and

then

remove
control
stem

assem

bly

y
J

b
i1

I

I
1

II

i

l

I
BR773

Front

cable

Fully
release

control
stem

2

Loosen

adjusting
nut
at
balance

lever

3

Disconnect
front
cable
from
con

trollever

4

Remove
retainer

spring
at

cable

guide
bushing
Fig
BR

47
Control

stem

5

Disconnect
rear
cables
R
H
and

L
H
from
balance
lever
brackets

See

Figure
BR
48

6
Remove
balance
lever
brackets

from
crossmember

7

Detach
front
cable

clip
and

pull

front
cable

rearward

BR
19
k

1

BR663

Fig
BR
48
Balance
lever

Rear
cable

Fully
release
control

stem

2

Remove
both
rear

brake
drums

and
disconnect
rear
cable
from

toggle

lever

3

Detach

spring
and

spring
retainer

4

Remove

rear
cable
from
brake

disc

5

Disconnect
rear

cable
from

balance
lever
bracket

6

Detach
cable

clips
and

remove

rear
cable

INSPECTION

1

Check
control
stem
and
ratchet

for

evidence
of
wear
or

other

damages

Replace
parts
which
are

faulty

2

Replace
worn
or

fatigued
springs

3

Check
wires

for
evidence
of
dis

continuity
or
other
deterioration
Re

place
if

necessary

4

Replace
faulty
warning
light

and
or
switch

S

Check

parts
at
each
connection

and
if
found
deformed

or

damaged

replace

INSTALLATION

Install

hand
brake

assembly
in
the

reverse

sequence
of
removal

by
closely

observing
the

following
instructions

When

installing
apply
a

coating

of

grease
to

sliding
contact
surfaces

Make
Sure
that

each
sliding

part
func

lions

smoothly

2

Upon
completion
of
installation

of
hand
brake

assembly

adjust
the

entire

system
referring
to
the
instruc

lions
described
under

topic

Adjust

ment

3

Make
sure
that
each
cable
is

not

interfered
with

by

any

adjacent
parts

Do
not

apply
an
undue
stress
to

cables

Condition

Excessive

pedal
travel

Spongy

pedal

Poor

braking
effect

Brakes

drag
Brake

Syst
em

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Probable
cause

Low
brake
1uid
level
or

empty
master

cylinder
reservoir

Leakage
in
master

cylinder

Deteriorated
check
valve

Air
in

system

Faulty
brake

adjustment

Low

1uid
level
in
master

cylinder

Air
in

system

Faulty
brake

adjustment

Reservoir
filler

cap
vent

hole

clogged

Swollen
hose
due
to
deterioration

or
use
of

poor
quality
hose

Distorted

brake
shoes
or

excessively
worn

or

cracked

brake
drum

Soft
or
swollen

caliper
seals

Use
of
a
brake

1uid
with

too
low

boiling

point

Fluid

leakage
in

brake
lines

Low

brake
1uid
level

or

empty
master

cylinder
reservoir

Air
in

brake
lines

Excessive
shoe
ta
drum

clearance

Grease
oil

mud
or

water
on

linings
or

pads

Deterioration
of

linings
or

pads

Local
fit
of

linings
or

pads

Linings
or

pads
excessively
worn

Master

cylinder
or
wheel

cylinders
in

poor

condition

Binding
mechanical

linkage
at
brake

pedal

and
shoes

Clogged
brake
lines

Incorrect

adjustment
of

wheel

bearings

Improper
shoe
t

drum
clearance

Weak
shoe
return

springs

No
free
travel
in

brake
shoe

return

BR
22
Corrective
action

Fill
and
bleed
as

necessary
Test

for
source

of

leakage
by
examining
all
lines

connec

tions

and
wheel

cylinder

Overhaul
master

cylinder

Replace
check
valve
and
bleed

system

Bleed

system

Adjust
shoe
to
drum
clearance

Inspect

auto

adjuster
operation

Top
with
1uid
and

inspect
for

leakage

Correct
as

necessary

Adjust
shoe
to

drum
clearance

Inspect

aut

adjuster

operation

Clean
and

bleed

system

Replace
hose
and

bleed

system

Replace
faulty

parts

Drain

hydraulic
system
flush
with
alcohol

and

replace
all
seals

Replace
with

specified
brake

1uid
and
bleed

system

Check

master

cylinder

pIpIng
and
wheel

cylinder
for
leaks
and

repair

Fill
and
bleed

as

necessary

Bleed

system

Adjust

Clean
brake
mechanism
and
check
for

cause

of

problem

Replace
linings
or

pads

Replace

Shave
or

replace

Replace

Repair
or

replace

Free

up
as

required

Check
and

clean

Adjust
or

repair

Adjust

Replace

Adjust

pedal
height

Condition

Brake
chatters

Brake

squeals

Pedal

pulsates

Brakes
fade

Brakes

drag

Unbalanced
brakes
Brake

System

Probable
cause

Groove

or
out
of

round
brake
drum

Loose

or
bent

brake

disc

Distorted
brake
shoes

or

pads

Grease
or
brake
fluid
on

linings

Dirty
or
scored
brake

drums

Distorted
brake
shoes
or
bent

support
plate

Weak
or
broken
brake
shoe

retaining
spring

or

return

spring

Glazed
or
contaminated
brake

lining

Out
of

round
or
off
center
drum

Brake
fluid
has
too
low

boiling
point

Use
of

improper
linings
or
brake

linings
are

contaminated

Brake
drums
are
out
of
round

Hydraulic
connections
master

cylinder
and

wheel

cylinders
are

corroded
or

damaged

Bleed
screw
is

open

Pedal

linkage
is

binding
or

push
rod

adjust

ment
is
too

long

Master

cylinder
compensator
part
is
ob

structed

Seized
master

cylinder
piston

Poor
shoe
condition

Poor

wheel
cylinder
condition

Deformation
of

piston
cups

Hand
brake
will
not
return

Clogged
master

cylinder
return

port

Improper
tire
inflation

Improper
adjustment
of
shoe

to
drum
clear

anee

Grease
oil
mud
or
water
on

linings
or

pads

Mud
in

brake
drum

Deterioration
of

linings
or

pads

Excessive
wear
of

linings
or

pads

BR
23
Corrective
action

Grind
or

replace
as

required

Tighten

support
plate
bolts
to

specified

torque
or

replace
plate

Replace
as

necessary

Replace
linings

Blowout

assembly
with

compressed
air
or

refinish
drum

Replace
faulty
unit

Replace
if

faulty

Cam

ground
lining
to
eliminate

glaze
If

it

doesn
t

replace
linings

Turn

drum
or

replace
as
necessary

Drain
and
fill

system
with

approved
fluid

Replace
linings

Repair
or

replace
as
necessary

Repair
as
necessary

Close
screw
and
bleed

system

Lubricate

linkage
check

pedal
return

spring

for
condition
and

adjust
push
rod

as
neces

sary

Blowout

foreign
matter
with

compressed

air

Disassemble
master

cylinder
and

replace

piston
Bleed

system

Clean
and

repair

Repair
or

replace

Replace

Check
and

repair

Clean

Inflate
to
correct

pressure

Readjust

Clean
brake

mechanism
and
check
for
cause

of

problem
Replace
linings
or

pads

Clean

Replace

Replace

Condition

Pedal

yields
under

slight
pressure
Brake

System

Probable

cause

Wheel

cylinder
in

poor
condition

Poor

sliding
condition
of
brake
shoe

Looseness
of

cylinder
body
or

back

plate

securing
bolts

Scored
or
out

of
round
drums

Sticking
wheel

cylinder

cups

Deformation
of
back

plate

Incorrect

adjustment
of
wheel

bearings

Incorrect

adjustment
of
wheel

alignment

Looseness
of
leaf

spring
securing
U

bolts

Faulty
N
L

S
V

Deteriorated
check
valve

Ex

ternalleaks

Leakage
on
master

cylinder

BR
24
Corrective
action

Repair
or

replace

Adjust

Fasten
or

replace

Recondition
or

replace
brake

drum
as
reo

quired
Check
for

improper
lining
contact

with
drum
and

grind
lining
if

necessary

Recondition
or

replace
cylinder

Replace

Adjust
or

replace

Adjust

Tighten
or

replace

Replace

Replace
check
valve
and
bleed

system

Check
master

cylinder

piping
and

wheel

cylinder
for
leaks
and

repair

Overhaul
master

cylinder

DESCRIPTION

MAINTENANCE
AND
SERVICE

TIRE
INFLATION

TIRE
REPAIR

WHEEL
REPAIR

WEAR

DESCRIPTION

The

620
series
models
are

equipped

with

4lV
14

wheels
with
25

mOl
0
98

in

offset
All
tires

are
tubeless
Wheel

and
Tire

WHEEL
AND

TIRE

CONTENTS

WT2

WT
2

WT2

WT2

WT
2

WT
2
TIRE

ROTATION

CHANGING
TIRE

INSPECTION

WHEEL

BALANCE

WHEEL
AND

TIRE

Tire
size

Model
Tire
size
Wheel
size

All

models
6

00
I
4
6PR

Tubeless
4UJ
14

Tire

pressure

Unit

kgl
em
2

psi

Vehicle

speed
km
h

MPH
Under

Over

100
km
h
100
km
h

Model

60

MPH
60
MPH

Front

1
5
21
1
8

26

Unloaded

Rear
175

25
2
25
32

All

models

Front

1
5

21
1

8
26

Loaded

Rear
3
0

42
3
15
4S

Note
Tire
inflation

pressures
should

be
measured

when
tires
are
cold

MAINTENANCE
AND

SERVICE

TIRE

INFLATION

Correct
tire

pressure
is

very
im

portant
to
ease
of

steering
and

riding

comfort

This
also
reduces

driving

sound

to
a
minimum

resulting
in

longer
tire

life
that
is

overinflation
or
underinflation

promotes
wear
at

cen

ter
tread
or

shouider
of
tire

If

aU
tires
are

inspected
frequently

and
maintained

correct
tire

pressure
it

is

possible
to

detect

sharp
material

in

the
tread

Also
the
above
check

avoids

abnormal
wear
which
invites
serious

problem
If
tires
indicate

abnormal
or

uneven

wear
the
cause
of

problem

should
be
detected
and
eliminated

After

inflating
tires

leakage
in
valve

should
be

checked
Without

valve

caps

leakage
will

occur
due
to

dirt
and

water

resulting
in

underinflation
Ac

cordingly
whenever
tire

pressure
is

checked
be
sure
to

tighten
valve

caps

firmly
by
hand

WT
2
WT3

WT3

WTA

WTA

WT
4

TIRE
REPAIR

In
order

to

inspect
a
leak

apply

soapy
solution
to
tire
or

submerge
tire

and
wheei

in
the

water
after

inflating

tire
to

specified

pressure
Special
in

spection
for

leaks
should
be
carried

out
around
the
valve
wheel
rim
and

along
the
tread

Exercise
care
to
bead

and
rim
where

leakage
occurs

Wipe

out
water
from

area
which

leaks
air

bubbles
and

then
mark
the

place
with

chalk

After

removing
the
materials
which

caused

puncture
seal
the

point
When

repairing
the

puncture
use
the

tire

repair
kits

which
are
furnished
from

tire
dealers

following
the
instructions

provided
with
the

kits
In

case
that
a

puncture
becomes

large
or
there
is

any

other

damage
on
the

tire
fabric

repair

must
be

carried
out

by
authorized

tire

dealers

WHEEL
REPAIR

Inspect
the
wheel
rim

flange
for

bend

or
dents

The

flange
should
be
cleaned

by
a

wire

brush
when
rust
is
found

on
the

flange
Furthermore
if
excessive

pitting
occurs

on
the

rim
eliminate
it

with
a
file

WEAR

Missilgnment

When
the
front
wheels

align
in

excessive
toe
in
or

toe
out
condition

tires

scrape
the

tread
rubber
off
The

wear
of
tread

appears
feathered

edge

4
To

jack
up
rear

place
jack
under

rear

axle
case
close
to
the
side

of
rear

spring
after

applying
parking
brake

and

blocking
front
wheels

WH077

Fig
WT
7

Jacking

up
rear
side

S

Remove
wheel
nuts
and
wheel

from
drum

6
To

install
wheel

reverse
the

above

steps

Tighten
wheel
nuts
in
criss
cross

fashion
to
8

0
to
9
0

kg
m

S8
to
6S

ft

Ib

Note
Nerer

get
under
the
vehicle

while
it

is

supported
only
by
the

jack
Always
use
S8

fety
stands
to

support
the

side
member
of

body

construction
when

you
must

get

beneath
the
vehicle

INSPECTION

WHEEL
BALANCE

The

wheel
arid
tire

asSembly
should

be

kept
balanced

statically
and

dynam

ically
Wheel
and
Tire

Proper
tire

balance
is

necessary

when

driving
the
vehicle

at

high

speeds

Consequently
the

wheel
and

tire

assembly
should
be

properly
re

balanced
whenever

puncture
is

re

paired

The
wheel
and

tire

assembly
be

comes
out
of
ba1ance

according
to

uneven
tire
wear

Severe
acceleration

and

braking
or
fast

cornering
is
the

cause
of

wear

on
tire

resulting
in

unbalance
of
tire
and
wheel

assembly

The

symptom
of
unbalance

appears

as

tramp
vehicle
shake
and

steering

malfunction

To

correct
unbalance

use

proper

wheel
balancer

Maximum

allowable

unbalance

177

gr
cm
2
5
in

oz

10

gr
O
3S
oz
at
rim

circumferences

Balance

weight

10
to
60

gr
O
3S

to
2
12

oz

at

10

gr
0
3S

oz
intervat

Note
Be

sure
to

place
the
correct

balance

weights
on
the

inner

edge

of
rim
as

shown
in

Figure
WT
S

00
not

put
more
than
two

weights

on
each

side

WHEEL
AND
TIRE

In

order
to
ensure

satisfactory

steering
condition
as

well

as
maximum

tire
life

proceed
as
follows

Check

wheel
rim

for
rust

distor

tion
cracks

or
other
faults

WT
4
Thoroughly
remove
rust
dust

oxidized
rubber

or
sand
from
wheel

rim
with
wire

brush

emery
cloth

or

paper
Use

dial

gauge
to
examine

wheel
rim

for
lateral

run
out

Lateral
run
Qut
limit

Less

tltan
1
5
mOl
0

059

il
total

indicator

reading

WTOO5

Fig
WT

B
Whetl

rim
run

out
check

points

Note
In

replacing
tire

t
e

extra
care

not
to

damage
tire
bead

rim

flange

and
bead
seat

Do

not

use
tire
irons

to
force

beads

away
from

wheel
rim

flange
that
is

always
use
tire

replacement
device

whenever

tire
is
removed

2

Discard
when

any
of

the
follow

ing
problems
occur

1

Broken
or

damaged
bead
wire

2

Ply
o

treairsepanitiori

3

Cracked
or

damaged
side

wall

etc

Available
worm

bearing
adjusting

shim

No
Thickness

mOl

in

I
0
762
0
0300

2
0
2S4
0
0100

3
0
127
0
0050

4
O

OSO
0
0020

5

Adjust
the
worm

bearing

preload

with

Preload

Gauge
ST3127S000

by

selecting
suitable

bearing
shims
so
that

the
initial

turning

torque
of

steering

column
is

the

specified
value

Initial

turning
torque
of

steering

column
shaft

New
worm

bearing

4

0
to
6
0

kg
em

S6
to
83
in
oz

Used
worm

bearing

2
4
to
4
4

kg
em
33
to
61
in

oz

6

Insert

adjusting
screw
into
the

T

shaped

groove
at
the
sector
shaft

head

and

adjust
the
end

play
between

sector
shaft
and

adjusting
screw
until

it
is
within
0

01
to
0
03
mm

0
0004

to
0
0012
in

by
choosing
suitable

adjusting
shims

Available
sector
shaft

adjusting

screw
shim

No
Thickness
mOl
in

I
1
57S
0
0620

2
1
550
0
0610

3
1
525
0
0600

4
I
S00
0
OS91

S
1
475
0

0581

6
I

4S0
0
0571

7
Rotate
ball
nut

by
hand
until
it
is

in

the
center

of
its
trovel
then
install

sector
shaft

together
with

adjusting

screw
in

gear
housing
ensuring
that

the
center

gear
of
sector
shaft

engages

with
that
of
ball
nut
STEERING
SYSTEM

8

Install
sector
shaft
cover

to

gear

housing
Be
sure

to

apply
sealant
to

each
face
of
sector
shaft
cover

packing

when

installing
cover

9

By
turning

adjusting
screw
coun

terclockwise
attach
sector
shaft
cover

to

gear
housing
and
then

temporarily

secure
it
with
its

fixing
bolts

10
Pull
sector
shaft
toward

cover

approximately
2
to
3
mOl

0
08
to

0
12
in

by
turning

adjusting
screw

counterclockwise
and
tighten
sector

shaft
cover

fixing
bolts
to
l
S
to
2
5

kg
m

11
to
18
ft
Ib

II
Push
sector
shaft

against
ball
nut

gear
by

gradually
turning

adjusting

screw

clockwise
until

sector
shaft

gear

lightly
meshes
with
ball
nut

gear
and

then

temporarily
secure

adjusting

screw
with
lock
nut

12
Install

gear
arm
to
sector
shaft

and
move

sector
shaft
several
times

from
the
side
of

gear
arm
and

make

sure
that
it
turns

smoothly

13

Adjust
the
backlash
at
the
neu

tral

position
of

gear
arm

by
turning
in

or
out

adjusting
screw
so

that
the

movement
of
the

gear
arm

top
end
is

less
than
0
1
mOl
0
004
in

0

ST207

Fig
ST
10
Mea

uring
backlash

14
Turn

adjusting
screw
approxi

mately
1
8
to
1

6
turn
clockwise
and

then

retighten
lock

nut
to
3

0
to
4
0

kg
m
22

to
29

ft
Ib

IS
Fill
recommended
gear
oil

ap

proximately
0
33
liter
X

U
S

pI

X

Imper
pt
into

gear
assembly

through
the
filler
hole
and
install
filler

plug

ST
5
Inspection
and

repair

Wash
clean
all
the
disassembled

parts
in
solvent
and
check
for
condi

tions

Sector

shaft

1

Check

gear
tooth
surface
for

pit

ting
burrs
cracks

or

any
other
dam

age
and

replace
if

faulty

2
Check
sector
shaft
for
distortion

of
its
serration

and
if

necessary
re

place
In

this
case
be
sure
to
check

gear
housing
for
deformation

Steering
column
shaft

assembly

1

Inspect
the
ball
nut

gear
tooth

surface
and

replace
if

pitting
burrs

wear
or

any
other

damage
is
found

2

Ball
nut

must
rotate
smootWy
on

worm

gear
If

found
too

tight
assem

bly
should
be

replaced
Check

as
fol

lows

Move

ball
nut
to
either
end
of

worm

gear
and

gradually
stand
steer

ing
column
shaft

assembly
until
ball

nut
moves
downward
on
worm

gear

under
its

own
weight
In
the
above

test
if
ball
nut
does
no
move

freely

over
entire

stroke
assembly
may
be

damaged
Replace
with

a
new
one
as

an

assembly

Note
In

this

inspection
be
careful

not
to
dama
e

ball
nut

guide
tube

Bearings
and

bushings

I

Replace
worm

bearings
if

pitting

wear

or

any
other

damage
is

found
on

them

2

Repiace
column

bushing
which
is

excessive
worn
or
deformed

3
If
sector
shaft

bushings
in

gear

housing
are
found
worn
or

damaged

replace
as
an

assembly
of

gear
housing

and

bushing

Oil
seal

gasket
and

O

ring

Do
not
reuse
above

parts
which
are

removed
once

Be

sure
to
use
new

parts
at
each

reassembly