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TM-5-6675-250-34 Survey Instrument Azimuth Gyro Lightweight( Leaser Siegler Inc. Models AG-8 and AG-8A) Manual
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Figure 1-1. Gyroscopic reference unit (GRU).
TM 5-6675-250-34
INTRODUCTION
GENERAL
Section I.
1-1. Scope
Form 2028-2 are attached in the back of the manual
for your use. Please mail your recommended changes
This manual is for your use in maintaining the
directly to Commander, U. S. Army Troop Support
Surveying Instrument: Azimuth, Gyro, Lightweight
Command, ATTN: DRSTS-MPP, 4300 Goodfellow
(SIAGL) Model AG-8 Type 1 and Model AG-8A
Blvd., St. Louis, MO 63120. A reply will be fur-
Type 2. Subsequent sections include description,
nished directly to you.
testing, troubleshooting, repair, and procedures
necessary to maintain the equipment in a serviceable
1-4. Equipment Serviceability Criteria (ESC)
condition. Information in this manual is to be used in
This equipment is not covered by an ESC.
conjunction with, information in the Operator and
1-5. Destruction of Army Material to Prevent
Organizational Maintenance Manual, TM 5-6675-
Enemy Use
250-12.
Using an axe, pick, mattox, sledge or another heavy
1-2. Maintenance Forms and Records
implement, damage all vital elements such as the
Maintenance forms, records, and reports that you
theodolite,  electronic control unit,  gyroscopic
are required to use are DA Form 314, 2400, 2401,
reference unit and battery.
2404 and 2406 (see TM 38-750).
1-6. Administrative Storage
1-3. Reporting of Errors
Administrative storage procedures which are to be
You can help to improve this manual by calling
used by maintenance personnel are described in TM
attention to errors and by recommending im-
740-90-1.
provements. Your letter, DA Form 2028 (Recom-
mended Changes to Publications), and DA Form
Periodic calibration of this equipment is not
2028-2 (Recommended Changes to Equipment
required.
Technical Manuals), may be used. Copies of DA
Section II.
DESCRIPTION AND DATA
1-8. Description
and preorienting the instrument is mounted on top of
the GRU. An adjustable tripod assembly is provided
a. General. The SIAGL is man portable north-
for supporting the unit.
seeking gyroscope capable of determining true north
(1) Internal components of the unit are con-
with extreme accuracy without the assistance of
tained in a cylindrical housing and are discussed in
celestial or landmark sightings. The SIAGL consists
detail in the theory of operation (para. 1-9). Controls
of a gyroscopic reference unit (GRU) with an integral
on the housing are limited to a caging knob; an
theodolite and tripod assembly, an electronic control
uncaged indicator light is located adjacent to the
unit (ECU), a transit case which houses the GRU
knob .
and auxiliary equipment. The complete SIAG1 is
(2) The theodolite contains a magnetic compass
contained in a transport case. The maintenance
for preorientation of the unit to approximately true
paragraphs  o f this manual contain detailed
north, a telescope for sighting and focusing, and a
descriptions of its components.
b. Gyroscopic Reference Unit (GRU). The GRU
microscope for reading a 0.02-mil graduated scale.
(fig. 1-1) contains the pendulous gyro, gyro motor,
The theodolite is secured to the GRU housing by
suspension system,  follow-up mechanism, and
three screws and is electrically connected through a
components necessary to accomplish the azimuth
cable.
determination operation. A theodolite for reading

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