75mm Pack Howitzer Left Side Telescope and Mount Cover -- NOS
75mm Pack Howitzer Left Side Telescope and Mount Cover - M410 - D82821
NEW OLD STOCK (NOS)
INFORMATION FROM TRAINING MANUAL TM 9-500:
General:
HOWITZER, PACK 76-mm, M116, w/e, consisting of CANNON,75-MILLIMETER PACK HOWITZER: M1A1 RECOIL MECHANISM:
M1A5, M1A7, or MIA8; on CARRIAGE: HOWITZER (pack), 75-mm, M8 is a general-purpose, towed, light field-artillery weapon. The howitzer is used for either direct or Indirect fire and can be elevated to high angles to deliver plunging fire on a target.
The weapon can be disassembled readily into nine major components for paracrate packing in parachute delivery and into eight major components for mule pack in animal transport. In traveling position for towing behind a prime mover, the weapon is almostbalanced on a two-wheel axle. A caster wheel can be attached to the trail to facilitate manual transport by the gun crew afterparachute delivery.
The howitzer cannon consists of a tube, breech ring assembly, operating lever latch, breechblock, firing mechanism, and lock. The howitzer carriage consists of a cradle, equilibrator and rocker assemblies, elevating mechanism, axle and traversing mechanism, front and rear trail assemblies, and wheels and tires. The recoil mechanism is a variable hydropneumatic type shock absorber that decreases the energy of the recoil gradually and so avoids violent movement of the cannon or mount. It is installed on the mount.
Differences among models
The recoil mechanism M1A6 is a modified M1A4:
the change being the redesign of the piston rod assembly and piston rod collar stop. Stronger bolts are also used to fasten the cylinder support to the bottom sleigh. The M1A7 is a modified M1A6: the M1A7 incorporates a floating piston spacer and low temperature packing fillers. This mechanism is filled with petroleum base hydraulic oil. The M1A8 is essentially the same as the M1A7, except that it is redesigned to incorporate a one-piece floating piston and low temperature packing fillers.
Data plate location
The cannon data are stamped on the right side of the cannon tube just below the lifting eye. The recoil mechanism identification plate is located on the left side of the bottom sleigh. -
Classification: Standard C (OTCM 87727).
CHARACTERISTICS
Cannon:
Weight (tube and breech mechanism) ------------------342 lb
Weight of tube ----------------------------------------221 lb
Length (with breech ring) -----------------------------59 in.
Length of tube --------------------------------3 ft. 11½ in.
Rifling:
Length --------------------------------------3 ft.1/2 in.
Number of grooves ------------------------------------28
Twist, right hand ----------------one turn in 20 calibers
Type of breechblock ------------------horizontal sliding wedge
Type of firing mechanism ----------------------continuous pull
Estimated accuracy life of tube ----------------------20,000 rd
Carriage:
Weight ------------------------------------------------918 lb
Type of recoil mechanism --------------------hydropneumatie
Number of recoil cylinders ---------------------------------2 Length of recoil:
Normal --------------------------2 ft. 3 in. to 2 ft. 7 in.
Maximum -------------------------------------2 ft. 8 in.
Capacity of recoil mechanism ----------------------------3 pt
Elevation (max) ------------------------------------------450
Depression (max) -----------------------------------------50
Traverse------------------------------------------R or L, 30
Operation of firing linkage --------------------------manual
Tire size and type --------------------------6:00 x 16 standard
Tire pressure -------------------------------------------20 lb
AMMUNITION
Types:
Semifixed ------------------------------------HE and SMOKE
Fixed-----------------------------------------------HEAT—T
PERFORMANCE
Muzzle velocity:
Shell HE M48 (chg 4) ------------------------------1,250 fps
Shell HE M48 (chg 1) --------------------------------700 fps
Range (Shell HE M48) -----------------------------------9,620 yd
Reference: TM 9-500