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REPA-
I R I NSTRUCTIONS
WORK WHICH CAN BE CARRIED OUT
WITH THE OVERDRIVE INSTALLED
CHECKIN
G
THE
O
ll
PRESSURE
The oil pr,essurecan
be
suitably checked when driv-
ing on
test
roll'
e rs
o
r on
a
motorway. T,he
check can
al,so be made with
the
vehicle jocked up but this
should
be
avo ided
for reasons of
safety.
Checking
is
as foHows:
1.
Remove the plug
undelr
the operation valve and
oonnect
the
pressure gauge SYO
2834,
see Fig.
4-42.
2.
Read ,off the preswre when driving on
dir'ect drive
at about
40
km.p.h.
(25
m.p.h.).
The
pressure
should
then
be
about
1.5
kg/cm
2
(21
Ib./sq
.in.).
3.
Eng'a'ge
the
overdrive
and
·
c
heck that
the pressure
rises
to
36-39
kg/cm
2
(510-550
.Ib./sq.in
.).
4. Disengag·e the
overdriVle
,and check the time
for
t.he pr'essure to
drop to
1.5
kgJ.cm
2
(21
Ib./sq.
in
.).
This
tjme must not
exceed 3
seco nds.
REPlACING THE SOLEN OlD
AND
OPERATING
VAlVE
The solenoid and operating valve are intJegrally built
as one unit, which is
,
r eplaced complete. For r'emoving
and fiiting, use a
25
mm
(1 ")
fixed spanner. Use a new
seall and
O ~rings
when fiMing. The tightening torque
shoU'ld be
4.2-5.5
kgm
(30-40
Ib.ft.).
CHECKING AND REPlACING THE RELIEF VAlVE
1. Remove the base
plat·
e ·and the pre-filter. Collect
the oil in an oil contaiiner. Warning. If the vehicle
has
bel
e n
.
,riven ,recently, the oi·1 may be hot and
cause
dO'mag·
e if it comes into contad with your
skin.
2.
Remov,
e the plug under the
r,
e lief valve with tool
SYO
2836,
see Fig.
4-43.
Pull out
,
t he large piston
SVD
2834
Fig. 4-42.
Checking
the oil pressure
VOLVO
103233
of the
f1e
li ef valve, then tJh
e
sprin
g a nd
sprin
g
reta,iner.
Ev·
e n th
e low-pressure
spring will O'lso
be
included in
the removal. Then pull ,out the sma+1
piston
with
its
sprin
g and spring
re,
t ainer,
a lso the
cylind
er and end
washer.
Us'
e a
pair
of
pli
ers
with
nalrrow jaws for
the
piston
unit
ond a
loop,
see
Fig.
4-44,
for
t.he
cy,li
nder and washer.
3.
Wash
a
ll
the parts in white spirit and blow
them
dry with compressed
a
ir.
Check
them
carefu
lly
for wea'r
and
damage. The pistons shou ld run
eas·ily in
their
cy
linde'rs.
Fau
lty
parts must
be
re-
placed.
N.B. The foHowing
uni~s
are
av·
a
il'
a ble as
spare pants: End washer,
cyli
nder, the sma
ll
piston,
ad juste.r
washer,
10w-pre
s5U're spring,
l'OIrg'
e piston
,
plug and
the O -lrings.
Fig.
4-43.
Removing the plug
VOLVO
103234
Fig. 4-44.
Removing
the relief
valve
VOLVO
103
11
4
4
:
17
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