construction. The differences are mainly in pressure
plate assemblies, linkages, and overall size.
Of the different types of clutch assemblies, the one
shown in figure 7-8 is known as the plate clutch. The
plate clutch is a simple clutch with two plates and one
disk, clamped between the two plates. Another type
(fig. 7-9) is the double-disk clutch. The driving
members of the single-disk clutch consist of the
flywheel and driving (pressure) plate. The driven
member consists of a single disk splined to the clutch
shaft and faced on both sides with friction material.
When the clutch is fully engaged, the driven disk is
firmly clamped between the flywheel and the driving
plate by the pressure of the pressure plate springs, and
a direct, nonslipping connection between the driving
and driven members of the clutch is formed. In this
position, the driven disk rotates the clutch shaft to which
it is splined. The clutch shaft is connected to the driving
wheels through the power train.
The double-disk clutch is substantially the same as
the single-disk clutch described in the section above,
except that an additional driven disk and intermediate
driving plate are added.
For more basic information concerning clutches
refer to your Construction Mechanic 3&2 TRAMAN
Figure 7-8.Single-disk clutch assembly.
Figure 7-9.Doubledisk clutch assembly.
The information given in this section is general and
may be applied to nearly every type of clutch you are
likely to encounter. Refer to the manufacturers repair
manuals for problems not listed here.
The most common symptoms of clutch
malfunctions are dragging, slipping, and noise.
Improper adjustment is one condition that leads to clutch
problems. You should always adjust the clutch
according to the manufacturers specifications. An
improperly adjusted clutch can cause clutch slippage
and hard shifting.
This condition results when the clutch disk does not
completely disengage from the flywheel or pressure
plate when the clutch pedal is depressed. As a result, the
clutch disk tends to continue turning with the engine and
attempts to drive the transmission.
Dragging may be caused by any of the following
Excessive free travel in the clutch linkage.
The clutch disk binding on the transmission
A warped or damaged pressure plate.