175mm Self Propelled

 

Specification from 1963

 

 

 

30 August 1963 TM 9-500

C 1

 

CANNON, 175 MILLIMETER GUN: M113; MOUNT, GUN-HOWITZER: M158;

RAMMER AND LOADER ASSEMBLY ORD NO. 10898300;

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 Information

 

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 9-1000-21835, 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.

 

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