175mm Self Propelled
Specification from 1963
30
August 1963
TM
9-500
C
1
CANNON, 175 MILLIMETER GUN: M113; MOUNT, GUN-HOWITZER: M158;
RAMMER
MECHANISM, FIRING, CANNON: M35
Secondary
Item
Model Line
item No. Federal
stock No.
Cannon Mount
Mechanism
M113 (T256E3) 1025-735-4329
M158 1025-863-5613
M35 1025-895-9182
General
CANNON, 175 MILLIMETER GUN: M113
(T256E3) with MOUNT, GUN-HOWITZER: M158, RAMMER AND LOADER ASSEMBLY ORD No.
10898300, AND MECHANISM, FIRING, CANNON: M35, provides the armament for GUN,
FIELD ARTILLERY, SELF-PROPELLED: 175-mm, M107 (T235E1).*
The cannon M113 consists of a tube
assembly screwed into an internal thread In a breech ring and locked in place
by a key and a screw. The tube assembly
is of monobloc (one-piece) construction.
The chamber and bore are chrome-plated.
Longitudinal rails secured to three hoops shrunk onto the jacket
maintain the alignment of the cannon In the mount. The breech consists of an outer breech ring containing internal
threads into which the tube is threaded.
The gun-howitzer mount M158 includes
the recoil mechanism of the hydropneumatic variable recoil type, which controls
the forces created by firing and checks the movement of the recoiling parts
gradually, to avoid displacement of the vehicle, and also returns the recoiling
parts into their original position. The
major components are the recoil, counterrecoil, and recuperator cylinders,
contained In the gun cradle, and the replenisher cylinder.
The rammer and loader assembly
operates to lift a projectile from the rear or left side of the vehicle,
position it for ramming, and ram it into the cannon chamber. Hydraulic power for operation is obtained
from the vehicle hydraulic system.
Operation can also be accomplished manually by means of hand cranks.
The firing mechanism is a percussion
type and is operated manually by a lanyard.
Differences
among models
Data
plate location
Classification:
Standard
A (OTCM 37597)
CHARACTERISTICS
Cannon:
Weight:
Cannon complete 13,800
lb
Barrel assembly 12,050
lb
Breech mechanism 1,750 lb
Tipping
parts 18,300
lb
Length:
Tube 413 in.
Cannon 35
ft, 8 in.
Rifling:
Length
349.16 in.
Number of grooves
48
Bore:
In calibers
60
Diameter 175-mm
Breechblock Welin-step thread
Firing mechanism:
Type percussion
Operation manual, by lanyard
Mount:
Weight 4,500 lb
Recoil mechanism:
Weight (approx) 3,925 lb
Type hydropneumatic
Number of recoil
cylinders 1
Length of recoil:
Normal high elevation-28 to 30 in.
Maximum low
elevation-68 to 70 in.
Equilibrator
pneumatic
Type of recoil oil FSN 9150-255-4443 (OHC)
Oil capacity 15 gal
Oil reserve:
Replenisher
2 pt
Recuperator
2 pt
Elevation (max) 65 deg
Depression 0 deg
Turret traverse (right or left) 30 deg
Traversing and elevating operation manual or hydraulic
AMMUNITION
Type HE
Loading separate
PERFORMANCE
Muzzle velocity 3000 fps
Range (maximum) 32,800 meters
Allowable recoil (variable)
Rate of fire:
Normal 1 rd per 2 min
Maximum 1 rd per 1 min
Maximum number of rounds fired consecutively at
max rate
Maximum powder pressure permitted 50,000
psi
Average accuracy life 400 rd (EFC)
EQUIPMENT
Sighting and Fire control:**
Installed
on self-propelled gun M107 prior to issue:
MOUNT,
TELESCOPE: direct fire, M138
MOUNT,
TELESCOPE: panoramic, M137 (T186E3)
Boxed and stowed on
self-propelled gun M107 prior to issue:
BINOCULAR:
M17A1
FUZE
SETTER: M26 and M27
LIGHT
INSTRUMENT: M52
PERISCOPE,
TANK: M17
POST,
AIMING: M1A2
QUADRANT,
FIRE CONTROL: elevation, M15 (T23E2)
QUADRANT,
FIRE CONTROL: gunner's, M1A1
REFLECTOR,
AIMING POST: clear, M1
REFLECTOR,
AIMING POST: red, M2
SCALE.
GRAPHICAL FIRING:
SCALE,
GRAPHICAL FIRING: site
TELESCOPE,
ELBOW: direct fire, M116C
TELESCOPE,
PANORAMIC: M115 (T146)
Basic Issue Item: See TM 9-2300-216-10
INSTRUCTIONAL
MATERIAL
PROJECTILE, 175 MILLIMETER, DUMMY:
CHARGE, PROPELLING, 175 MILLIMETER, DUMMY:
PRIMER, PERCUSS10N INERT:
References: TM 9-2300-216-10, TM 9-1000-218—35, TM
9-1000-218-35P
*For characteristics and data, see item in section
23.
**For characteristics and data, see Item in
sections 12, 14, 18, and 27.
Thanks to Lynden T. Couvillion (Couvi) for
sending in the data.
Thanks to Charles E. Stephenson for preparing the
information.