SECTION
2
THE
UNDERCARRIAGE
DESCRIPTION,
MAINTENANCE
AND
TROUBLESHOOTING
General Description
The Undercarriage includes
the
carbody, turntable
bearing,
the
track drives and
the
track assemblies.
The carbody and turntable bearing are welded
together and
will
be considered
as
one unit.
Each track assembly consists
of
the
track frame,
rollers, chain, pads, guides, ider wheel assembly and
the
drive sprocket.
The track drive includes
the
drive motor,
the
brake,
and
the
double planetary gear reducer.
:~.---
IDLER WHEEL
ASSEMBLY
.....
......._
___
-
.....
______
.____
g---~
Operation
The tracks are driven
by
tandem
hydraulic motors.
When hydraulic fluid
is
directed
to
the
drive
motor
(with brake released),
it
creates driving
torque
which
is
transmitted through
the
planetary transmission
to
the
drive sprocket.
As
the
sprocket turns, it causes
the
track, supported by
the
rollers and idler wheel
to
walk around
the
track frame.
Component Listing:
1.
Carbody and Turntable Bearing
2. Track Assemblies
3. Track Drive Assemblies
..
~_
-
DRIVE
SPROCKET
TRACK
CHAIN
GUIDES
TRACK
ROLLERS
Figure
20. The
Undercarriage
16
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