Saab Gearbox: new & used Monster car gearboxes 99, 900 models
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Saab's Saxomat is
type of automatic clutch / gearbox and is available as an option on some of the
Saab vehicles,
Volkswagen and
BMW. The system also reappeared
in the 1990s as Sentronic.
Cars with a Saxomat gearbox
The clutch does not have a clutch pedal. The Saxomat consisted of two independent systems,
the centrifugal clutch and the servo clutch. The centrifugal clutch was engaged
above certain engine RPM by centrifugal force, acting on spinning weights inside
the clutch, similar to a centrifugal governor. The servo clutch used an electric
switch that supplied vacuum via an actuator valve to a reservoir that disengaged
the cluch. The clutch is disengaged automatically whenever the gear shift lever
was touched.

Olymat (Saxomat) Automatic
Clutch / Gearbox
The Olymat (Saxomat) clutch / gearbox is a combination of two single dry plate
clutches: one is operated by a centrifugal action and utilises a bronze friction
material and another is a normal type with asbestos material and is operated by
a release bearing, a clutch lever and a vacuum actuator. The illustration to the
left shows the high-rpm situation vhere the centrifugal clutch / gearbox is engaged.
The illustration to the right shows the low-rpm situation where the centrifugal
clutch is released.

The purpose of the clutch control
system is to release the clutch whenever the gearlever (1) is operated
and reengage the clutch when a new gear has been selected and the acceleratorpedal
is depressed. Vacuum is supplied from the intake manifold and stored in a reservoir.
When the gearlever is operated electric current is supplied to the solenoid in the
controlvalve (2). Vacuum is transferred to the vacuum-diaphragm-actuator (3) which
pulls the clutchlever and releases the clutch. The diaphragm-valve-system in the
right end of the control-valve (2) ensures a controlled vacuum release and thereby
a soft reengagement of the clutch. The thin hose connection to the upper part of
the carburettor signals a hard depressed accelerator which makes the clutch take-up
faster.
Other Saab vehicles available.
75, GT750, 99, 900, 90, Monster, Formula Junior, Aero-X, Catherina, EV-1, Quantum,
SAABO, SPG, Saalina, Sonett, Sport.