TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 11 of 590
TM 9-1240-401-34&P
CHAPTER 1
INTRODUCTION
Section I.
1-1.
1-2.
1-3.
1-4.
1-4.1
Section II.
1-5.
1-6.
1-7.
1-8.
1-9.
Section Ill.
CHAPTER INDEX
Page
GENERAL INFORMATION.
.....................................................................................
.
1-1
SCOPE .
.........................................................................................................................
1-1
MAINTENANCE FORMS, RECORDS, AND REPORTS .
............................................................
1-1
OFFICIAL NOMENCLATURE, NAMES, AND DESIGNATIONS.
...............................................
. 1-1
REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR’s) .
..........................
.
1-2
CORROSION PREVENTION AND CONTROL (CPC).
...........................................................
1-2
EQUIPMENT DESCRIPTION AND DATA.
..........................................................................
1-2
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
. 1-2
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.
................................................
.
1-18
DATA PLATES .
..............................................................................................................
. 1-19
DIFFERENCES BETWEEN MODELS.
....................................................................................
1-21
EQUIPMENT DATA .
...........................................................................................................
1-22
PRINCIPLES OF OPERATION .
.......................................................................................
.
1-24
Section I. General Information
1-1. SCOPE
Type of manual: Direct and general support maintenance.
Model numbers and equipment name: M146 telescope mount, M118A2/M118A3 elbow telescope, M145/M145A1 telescope
mount, M117/M117A2 panoramic telescope, M15 fire control quadrant, M42 periscope, and linkage assembly.
Purpose of equipment: Used on the M109A2/M109A3/M109A4/M109A5/M109A6 howitzer to provide sighting and targeting
capabilities.
1-2. MAINTENANCE FORMS, RECORDS, AND REPORTS
Department of the Army forms and procedures used for equipment maintenance will be prescribed by DA PAM 738-750, The
Army Maintenance Management System (TAMMS).
1-3. OFFICIAL NOMENCLATURE, NAMES, AND DESIGNATIONS
OFFICIAL NOMENCLATURE
COMMON NAME
Howitzer, medium, self-propelled
155mm, M109A2/M109A3/M109A4/M109A5/M109A6
Howitzer
M42 tank periscope
O-ring
Quadrant, fire control, M15
M15 quadrant
M42 periscope
Preformed packing
Wormshaft housing
Cross-level mechanism
Change 1
1-1
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