Section I. GENERAL
indicate quantity. Numbers preceding nomenclature
callouts on illustrations indicate the preferred
a. These instructions are published for the use
of the personnel to whom the Harnischfeger truck crane
Model M320T is issued. They provide information on the
1-2. Forms and Records
operation, lubrication, and preventive maintenance
services of the equipment, accessories, components,
DA Forms and records used for equipment
b. This manual is divided into two parts. Part
maintenance will be only those prescribed by TM 38-750,
Army Equipment Record Procedures.
One is primarily instructions for the operation of the
upper (revolving frame portion) of the machine. Part
recommendations for improving this publication by the
Two is primarily for the operation of the lower (carrier
individual user is encouraged.
Reports should be
portion) of the machine. Operators and maintenance
submitted on DA Form 2028 (Recommended Changes
personnel should read the instructions provided in both
to Publications) and forwarded direct to Commanding
parts of this mandal before operating or servicing the
General, U.S. Army Mobility Equipment Command,
c. Appendix A is a list of publications
ATTN: AMSME-MPP, 4300 Goodfellow Blvd. St. Louis,
applicable to this manual. Appendix B is the Basic Issue
Items authorized for use by the operator.
d. Numbers in parentheses on illustrations
Section II. DESCRIPTION AND DATA
c. Crane attachment. The crane boom is
used with a hook block to lift, swing, and position heavy
a. General. The Harnischfeger Model M320T
loads. It is used also in conjunction with the clamshell
truck crane is designed for universal operation, and may
and dragline buckets, and the piedriver. The clamshell
bucket (fig. 13) or dragline buckt (fig. 1-4) may be
installed on the crane boom for excavating or moving
loose material. Boom inserts are used to increase the
attachments are described, and detailed instructions for
boom length, or to extend the working range of the
the operation of each attachment are given Chapter 2
of this manual. The military load class is E-29.
d. Piledriver attachment.
b. Crane. The crane includes a revolving
attachment (fig. 1-5 is used in conjunction with the crane
frame, rotating machinery, gasoine engine, and an
boom and is used for driving piling into the ground in the
operator's cab. Lugs are provided at the front of the
construction of foundations, piers, and bases. The
revolving frame, to which the frontend attachments are
piledriver is attached to the crane boom point and is
instailed. A counter-weight is instaled at the rear of the
supported at the bottom by a catwalk.
revolving frame. The carrier on which the crane is
e. Backhoe attachment.
attachment (fig. 1-6) is designed to work below the