CLUTCH
Clutch - OperationCLUTCH
Clutch - Operation
20A
20A - 2
20A
20A - 2V1 MR-372-J84-20A000$166_eng.mif
120A
CLUTCH
Clutch - Operation
The clutch is a system which enables mechanical action to be either linked or not to an end component.
It is made up of an assembly of parts located between the engine and the transmission components.
It ensures the following functions:
●When engaged: transmits the power provided.
●When disengaged: this transmission is interrupted.
●Between the two positions: the transmission of power is gradually restarted.
There are different types of clutch:
●Depending on number of discs:
●dry single disc clutch,
●dry double disc clutch with single control,
●double disc clutch with separate control (double),
●wet or dry multidisc clutch.
●Depending on type of control:
●manual control,
●hydraulic control,
●electric control with electronic servo.
The system is made up of the flywheel (b) (attached to the engine) (the bolts in the centre are screwed into
the crankshaft (a)).
The clutch plate is attached to the gearbox.
The outermost part is called the friction or pad. The pressure plate ensures that the clutch plate is held
against the flywheel when the clutch is engaged, as this is what ensures that they turn at exactly the same
speed, one driving the other.
The pressure plate springs are pushed in by the clutch thrust bearing.
When the clutch control (hydraulic, or cable operated) is activated, the clutch plates move apart and less and
less movement is transmitted, leaving the gearbox free of the engine. This, for example, allows the vehicle
remain stationary without stalling the engine, or a gear to be changed.
The opposite action involves gradually releasing the clutch control, so that the engine and gearbox are
reconnected. This manoeuvre is called "slipping the clutch".
a:crankshaft
b:flywheel
c:pressure plate
d:spring
e:clutch pedal
f:clutch thrust bearing
g:gearbox input shaft
h:clutch plate
i:clutch plate pad
MR-372-J84-20A000$166_eng.mif
CLUTCH
Hydraulic clutch - Customer complaintsCLUTCH
Hydraulic clutch - Customer complaints
20A
20A - 5
20A
20A - 5V1 MR-372-J84-20A000$664_eng.mif
CLUTCH
Hydraulic clutch - Customer complaints
Customer complaint: the clutch pedal remains depressed after use.
Use the fault finding chart (see next page) in the following cases:
●The pedal remains depressed, without the vehicle moving, with the engine running or stationary:
–either after making several successive manoeuvres,
–or after leaving the foot down on the pedal using moderate force for a reasonably prolonged period.
The function temporarily returns to normal after releasing the pedal manually.
●The pedal remains depressed only after reasonably prolonged use of the vehicle, particularly in heavy
traffic.
The function temporarily returns to normal after releasing the pedal manually.
●The pedal remains depressed immediately after each manoeuvre. There is little or no force felt from the
pedal and returning the pedal manually does not stop the fault from recurring.
●After a prolonged stop in the disengaged position, first gear engaged (stop at traffic lights, for example),
the vehicle has a tendency to creep forward after a certain amount of time. If the pedal is released, it does
not return.
MR-372-J84-20A000$664_eng.mif
