CHAPTER 1
INTRODUCTION
Section I. GENERAL
1-2. Forms and Records
1-1. Scope
a. These instructions are published for the use of
personnel to whom the Crane-Shovel is issued. They
a. DA Forms and records used for equipment
provide information on the operation and organizational
maintenance will be only those prescribed in TM 38-750.
maintenance of the equipment. Also included are
descriptions of main units and their functions in
b. Report
of
errors,
omissions,
and
relationship to other components.
recommendations for improving this publication by the
b. Numbers in parentheses following nomenclature
individual user is encouraged. Reports should be
callouts on illustrations indicate quantity. Numbers
submitted on DA Form 2028 (Recommended Changes
preceding nomenclature callouts indicate preferred
to DA Publications.) and forwarded direct to
maintenance sequence of removal or disassembly, and
Commanding General, U.S. Army Mobility Equipment
reassembly or installation should be performed in
Command, ATTN: AMSMEMPP, 4300 Goodfellow
reverse order.
Boulevard, St. Louis, MO. 63120.
c. Report all Equipment Improvement Recommen-
dations as prescribed in TM 38-750.
Section II. DESCRIPTION AND DATA
steel frame work and panels. Several hinged doors and
1-3. Description
sliding panels provide access for removal of engine or
a. General.
The Harnischfeger Model 855BG
machinery.
Framed glass windows in operator's
Crane-Shovel is a crawler mounted, two cubic yard, 40
compartment can be opened for ventilation or additional
ton capacity, diesel engine driven unit. The booms are
visibility. Hand levers and foot pedals in operator's
interchangeable, enabling conversion to shovel, crane,
compartment control all motions of revolving frame
clamshell, dragline, backhoe, or piledriver operation.
operating machinery (para 2-8), and are easily within
reach of the operator from his adjustable seat.
upon which are mounted the engine, upper machinery,
and gantry, revolves around a center gudgeon and a
consists of two crawler tracks and the carbody. Each
live roller circle mounted on the crawler. It carries four
crawler track consists of forged steel side bars, (pinned
hook rollers (two in front and two at rear), which ride on
together), with track shoes bolted on. Tracks are chain
the underside of the roller path, and prevents tipping of
driven by the tread sprocket, and supported by a large
the rotating base. A counterweight is fastened at rear of
idler roller and numerous track rollers. The carbody
revolving frame. A gantry frame which contains gantry
houses the propelling and steering mechanism.
sheaves and harness, is mounted on the revolving
frame along with a collapsible high gantry which is
e. Engine. The crane-shovel units are powered by
provided for use in crane, clamshell, dragline, or
six-cylinder diesel engines, which operates both deck
piledriver service.
machinery and crawlers, and are equipped with
electrical starting motors. The engine may be either a
Harnischfeger Model 687C 18-ES or a Caterpillar Model
machinery on the revolving frame. It consists of rigid
D333TA, therefore in this manual the component
1-1
