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INTRODUCTION
This manual
is
designed
to
serve
as
a guide
in
maintaining and servicing
the
120 CRAWLER.
All
components and systems are covered, with the
exception
of
the
engine which
is
covered
in
the
engine manufacturer's
manual.
The book
is
basically divided into five sections, preceded by a general section
on
safety. nomenclature and Parts & Service information.
Section 1
gives
the
Scheduled Preventive Maintenance needed
to
keep the
machine
in
top
operating condition. It includes a maintenance schedule,
component capacities, service chart, lubricant and fluid recommendations,
and a pictorial listing
of
all
grease fitting locations. If more detailed
maintenance information
is
required, it can be found
in
the
individual service
sections.
Section 2 covers
the
undercarriage. It includes
the
turntable bearing, the
tracks and
the
track drives.
Section 3 covers
the
mechanical components
of
the
upperstructure. Included
are
the
engine, pump drive transmission,
the
swing assemblies and the boom
assembly.
Section 4 covers
the
Electrical System. It
is
divided into
the
charging system,
lights and instrument circuits, and
the
control circuits.
Section 5 covers
the
Hydraulic System. It includes
the
main system,
the
pilot
control system,
the
counterweight system,
the
supercharge system, and
the
auxiliary hydraulic system.
The sections are divided into two subdivisions. The first part covers
description, maintenance and troubleshooting. The second part covers
disassembly and repair.
Torque Charts and Schematics
of
the
hydraulic and electrical systems are
located
in
back
of
this manual. These should be used
as
aids
in
troubleshooting.
5
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