C 1.0 INTRODUCTION
The clutch works on the principle of friction in which when one stationary surface is brought into contact with a rotating surface, the
stationary surface also starts rotating. In actual practice one of the driving plates is the flywheel and the other is known as the
pressure plate. The driven plate is a clutch plate made of frictional material and directly mounted on the splined end of the clutch
shaft. In normal running condition the pressure springs keep the pressure plate in contact with the clutch plate. When the foot pedal
is pressed, the pressure plate moves away against the pressure springs allowing the clutch plate and thus the clutch shaft to
become stationary.
Depending on the design, it may have a single disc or two disc, one for the main transmission and the other for power take off (PTO).
C 2.0 FUNCTION
A clutch is a device that is used to transmit between an input and output shaft that operate at different speeds. A clutch cannot
multiply torque like a clutch torque converter. The torque output from a clutch will always equal the torque input. When the clutch is
slipping, the output torque is still equal to the input torque but power is lost (in the form of heat) because the output RPM is lower
than the input RPM.
C 3.0 WORKING
The main components are as under :
• CLUTCH PLATE
• PRESSURE PLATE
• CLUTCH COVER
• PRESSURE SPRINGS
• RELEASE FINGERS
• RELEASE BEARINGS
• CLUTCH SHAFT
• LINKAGES.
The clutch cover is bolted to the flywheel, and the clutch plate is mounted on the splined part of the clutch shaft, the front end of
which is freely supported on the pilot bearing fitted in the flywheel and other passes through the release bearing. In between the
pressure plate and the clutch cover, pressure spring are placed all around the circumference. Three fingers, also known as release
levers, are centrally fulcrum to the clutch cover with their outer ends connected to the pressure plate. A release bearing slightly
away from the free ends of the fingers moves to and fro on the clutch shaft with the hello of a fork, which is connected to the clutch
pedal through the linkages. As soon as the pedal is pressed, the release bearing moves towards the flywheel and presses the
fingers. As the fingers are fulcrum at a point in their length to the clutch cover and the other end is connected to the pressure plates,
as soon as the free ends are pressed inside by the release bearing, the outer tends to bring the pressure plate away from the clutch
plate against pressure springs, making the clutch plate hence the clutch shaft to disengage. But the pressure plate and cover
remain rotating along with the flywheel. Thus the condition of disengagement remains till the front pedal remains pressed. As soon
as pedal returns to the engaged position, the pressure plate moves ahead to press the clutch plate due to the pressure springs.
SERVICE MANUAL
C-1
ITL
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