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IDROCONVERT TRANSMISSiON
36'
Neutral Switch.
Check firstly with neutral switch fitted in position
and then with switch removed from the gearbox.
NEUTRAL SWITCH ON GEARBOX
Connect a test bulb in series between one neutral
switch lead and the positive terminal of a battery;
connect the other neutral switch lead to the negative
battery terminal.
The test bulb should stay on
when selector lever is in neutral position and until
gearshift control rod has moved about 1/4" (6 nun)
towards the engagement position of any gear
I
and
go off in any other position of selector lever.
N. B. - During this test the selector lever knob
must not be interfered with.
NEUTRAL SWITCH REMOVED FROM GEARBOX
Establish the same connections as those described
above.
Then, check that the test bulb stays on
when the plunger is free and off when the plunger
is depressed.
If
the neutral switch operates properly when
tested away from the car but is faulty when fitted
on the gearbox, check for worn plunger and gear-
shift control rod.
Renew any worn parts.
Relays.
Before interfering with the relays, check for loose
or wrong connections and broken leads.
SOLENOID CONTROL RELAY
The faulty operation of this relay causes the
solenoid plunger valve assembly to be stuck
in
one
position.
Consequently, the transmission remains
constantly engaged or disengaged according to the
position of the valve plunger. However, this defect
may also be due to plunger valve sticking or faulty
solenoid operation, as well as to defective neutral
switch or knob switch on selector lever.
Carry
out a check by elimination, inspecting each com-
ponent separately.
STARTER INHIBITOR SWITCH
If
the engine cannot be started by means of the
starter motor either with gear selector lever in
neutral, or when selector lever knob is gripped -
it
is
possible that the starter inhibitor switch is
faulty.
Renew any relay or inhibitor switch found to be
defective.
PRESSURE CHECKS
Should the Idroconvert transmission still be de-
fective in operation after overhauling has been
completed, carry out the pressure checks described
below.
Couple a revolution counter to the engine and
a pressure gauge to the oil pressure point situated
below the solenoid [in fig. 585 the pressure point
is closed by plug (2)].
Run the engine and transmission until the normal
operating temperature is reached. Then, perform
the three checks listed in the table below with
gear selector lever in neutral position. Finally,
compare the readings with the values given in
the table.
Oil Pressures
Check
Engine
Min.
No.
Max.
r.p.m.
p.s.L
kg/em'
p.s.i.
kg/em'
I
750
39.8
2.8
59.7
4.2
2
2000
49.8
3.5
76.8
5.4
3
5000
64
4.5
83.9
5.9
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