Geely EC718, EC718RV, EC715, EC715RV. Manual part — 240

3.1 Warnings and Notices

3.1.1 Warnings and Notices

Battery Disconnect Warning

Warning!

Warning: Unless directed otherwise, the ignition and
start switch must be in the OFF or LOCK position, and
all electrical loads must be OFF before servicing any
electrical component. Disconnect the negative battery
cable to prevent an electrical spark should a tool or
equipment come in contact with an exposed electrical
terminal. Failure to follow these precautions may result
in personal injury and/or damage to the vehicle or its
components.

Clutch Dust Warning

Warning!

Warning: When servicing clutch parts, do not create dust
by grinding or sanding the clutch disc or by cleaning parts
with a dry brush or with compressed air. A water-
dampened cloth--NOT SOAKED--should be used. The
clutch disc may contain fibers which can become
airborne if dust is created during servicing. Breathing
dust with fibers may cause serious bodily harm.

Moving Parts and Hot Surfaces Warning

Warning!

Warning: Avoid contact with moving parts and hot
surfaces while working around a running engine in order
to prevent physical injury.

Protective Goggles and Glove Warning

Warning!

Warning: Approved safety glasses and gloves should be
worn when performing this procedure to reduce the
chance of personal injury.

Road Test Warning

Warning!

Warning: Road test a vehicle under safe conditions and
while obeying all traffic laws. Do not attempt any
maneuvers that could jeopardize vehicle control. Failure
to adhere to these precautions could lead to serious
personal injury and vehicle damage.

Engine Lifting Notice

Note

Notice: When raising or supporting the engine for any
reason, do not use a jack under the oil pan, any sheet
metal, or the crankshaft pulley. Lifting the engine in an
unapproved manner may cause component damage.

Fastener Notice

Note

Notice: Use the correct fastener in the correct location.
Replacement fasteners must be the correct part number
for that application. Fasteners requiring replacement or
fasteners requiring the use of thread locking compound
or sealant are identified in the service procedure. Do not
use paints, lubricants, or corrosion inhibitors on
fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping
force and may damage the fastener. Use the correct
tightening sequence and specifications when installing
fasteners in order to avoid damage to parts and systems.

Sealant Notice

Note

Notice: Do not allow the RTV sealant to enter any blind
threaded hole. RTV sealant that is allowed to enter a
blind threaded hole can cause hydraulic lock of the
fastener when the fastener is tightened. Hydraulic lock
of a fastener can lead to damage to the fastener and/or
the components. Hydraulic lock of a fastener can also
prevent the proper clamping loads to be obtained when
the fastener is tightened. Improper clamping loads can
prevent proper sealing of the components allowing
leakage to occur. Preventing proper fastener tightening
can allow the components to loosen or separate leading
to extensive engine damage.

Transmission / Drive Axle

Warnings and Notices

3-3

3.2 Clutch System

3.2.1 Specifications
3.2.1.1 Fastener Tightening Specifications

Applications

Model

Specifications

Metric (Nm)

US English (lb-ft)

Clutch Cylinder Bolts

M8 × 1.25 × 25

18-22

13.3-16.2

Clutch Master Cylinder Assembly Retaining
Nut

M8

16-26

11.8-19.2

Clutch Cylinder Oil Pipe Bracket Bolts

M8 × 1.25 × 16

18-22

13.3-16.2

Clutch / Brake Pedal Assembly Retaining
Nut

M8

16-26

11.8-19.2

Clutch Pressure Plate and Driven Plate
Bolts

M8 × 1.25 × 14

22-33

16.2-24.3

3.2.1.2 General Specifications

Applications

Specifications

Metric (mm)

Inch (in)

Oil (Hydraulic Clutch)

DOT4

Clutch Pedal Working Travel

128

5.0

Clutch Pedal Free Travel

6-12

0.2-0.5

Clutch Pressure Plate Outer Diameter

256

10.1

Clutch Driven Plate Outer Diameter

212

8.3

Clutch Disc Wear Limit (Rivet Head Depth)

0.5

0.02

Flywheel Plane Run Out (Clutch Driven Plate Mating
Surface)

0.06

0.0024

3-4

Clutch System

Transmission / Drive Axle

3.2.2 Description and Operation
3.2.2.1 Description and Operation

The clutch is located between the engine and the transmission.
The clutch is retained to the flywheel rear surface by retaining
bolts. The clutch spline hub and transmission input shaft form
rigid connections. During driving, the driver can press or
release the clutch pedal, to temporarily separate the engine
and the transmission and or connect the engine and the
transmission gradually, to cut off or pass the engine to the
transmission input power. Clutch system mainly includes the
following components:

–

Drive parts: Clutch pressure plate. Clutch pressure plate is
fixed to the flywheel by retaining bolts.

–

Driven parts: Clutch driven plate with a splined hub. Spline
hub slides along the input shaft. Drive parts and driven parts
maintain contact through spring pressure. The pressure is
applied by the diaphragm spring in the pressure plate
assembly.

–

Working parts: Clutch separation system consists of the
clutch pedal, split shaft, fork and split bearings. When the
clutch pedal is pressed, the isolation bearings are pushed.
Bearings then pushes the separation rod within the
pressure plate and then the clutch is separated.

Transmission / Drive Axle

Clutch System

3-5

3.2.3 System Working Principle
3.2.3.1 System Working Principle

1. Make Sure Vehicle Smooth Start:

Before start, the vehicle is stationary. If the engine and
transmission has a rigid connection, and once a gear is
engaged, vehicle will suddenly move forward because of the
suddenly transmitted power. It not only will cause mechanical
parts damage, but also the driving force is not enough to
overcome the enormous inertia caused by the forward force,
so that the rapidly decrease in engine speed will shut down the
engine. If a clutch is used when starting, the engine and
transmission will be temporarily separated, and then the clutch
will gradually engage. Due to the sliding between the clutch
driving parts and the driven part, the torque transmitted from
the clutch gradually increases from zero, while the vehicle
driving force gradually increases, so that the vehicle starts
smoothly.

2. Easy to Shift:

During driving, there is a need to frequently switch to different
gears in order to adapt to changing driving conditions. If there
is no clutch to temporarily separate the engine and
transmission, then the transmission meshing gears will be hard
to separate due to the unreleased load. In addition, gears with
different speeds are difficult to mesh. Even if forced into the
mesh, there will be a huge impact on tooth side and cause
damage to parts. The use of the clutch to temporarily separate
the engine and transmission, then the original pair of meshing
gears surfaces pressure will be greatly reduced due to load
released, and are easy to separate. For the other pairs of
meshing gears, because the gear is separated from the engine,
the inertia is small. Use appropriate shifting action to make the
gears meshing circumferential speed to be equal to or close to
equal, so as to avoid or mitigate the impact between gears.

3. Prevent the Transmission System Overload:

During emergency braking, the wheel speed suddenly
decreases. Transmission system is connected to the engine
and has the rotation inertia, so it remains the original speed,
which generates a far greater inertia torque than the engine,
causing damage to the powertrain parts. As the clutch relies on
friction to transmit torque, so when the transmission system
load exceeds the friction torque, the clutch drive parts and
driven parts will skid, thus to prevent the overload .

3-6

Clutch System

Transmission / Drive Axle