D-74 122 mm field gun
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The 122mm D-74 towed gun is a
Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nation ...
-built gun. Developed in the late 1950s it provided direct and indirect fire for the Soviet Army. Today it is in reserve units with the Russian Army. It is in active service with the Egyptian Army and the
Pakistani Army The Pakistan Army (, ) is the land service branch of the Pakistan Armed Forces. The roots of its modern existence trace back to the British Indian Army that ceased to exist following the Partition of British India, which occurred as a result ...
.


History

The 122 mm (originally 48 lines) calibre has been in Russian service since the early 20th century. After World War II the Soviet Union developed two new long range guns to replace existing 122 mm and 152 mm guns such as 122 mm gun M1931 (A-19),
122 mm gun M1931/37 (A-19) 122 mm corps gun M1931/37 (A-19) (russian: 122-мм корпусная пушка обр. 1931/1937 гг. (А-19)) was a Soviet field gun developed in late 1930s by combining the barrel of the 122 mm gun M1931 (A-19) and the carriage of th ...
,
152 mm gun M1910/30 152-mm gun model 1910/30 was a Soviet gun, a modernization of World War I era 152-mm siege gun M1910. The gun was briefly used by RKKA in the German-Soviet War. Description M1910/30 was powerful long range gun with big (40°) maximum elevation ...
and
152 mm gun M1935 (Br-2) Fifteen or 15 may refer to: *15 (number), the natural number following 14 and preceding 16 *one of the years 15 BC, AD 15, 1915, 2015 Music * Fifteen (band), a punk rock band Albums * ''15'' (Buckcherry album), 2005 * ''15'' (Ani Lorak alb ...
. The two new guns were the 122 mm D-74 and the 130 mm M-46. The D-74 design was probably initiated in the late 1940s and it was first seen in public in 1955. It was designed by the well established design bureau at Artillery Plant No. 9 in Sverdlovsk (now
Motovilikha Plants PJSC Motovilikha Plants / Motovilikhinskiye Zavody PAO (MOTZ.MM) (russian: Мотовилихинские заводы; ) is a Russian metallurgical and military equipment manufacturer. In 2016 Motovilikha Plants joined NPO Splav, a Rostec compa ...
in Yekaterinburg), led by the eminent artillery designer Fëdor Fëdorovich Petrov who was also responsible for several World War II and later artillery designs. The design team also developed the 152 mm gun howitzer D-20 at much the same time, and both D-74 and D-20 use the same carriage. Both the 122 mm D-74 and 130 mm M-46 entered Soviet service, but the heavier shell and greater range of the M-46 meant that it outlasted the D-74.


Description

The D-74 has a 52 calibre barrel, with a double baffle
muzzle brake A muzzle brake or recoil compensator is a device connected to, or a feature integral to the construction of, the muzzle or barrel of a firearm or cannon that is intended to redirect a portion of propellant gases to counter recoil and unwanted ...
and a semi-automatic vertical sliding-block breach, with a tied jaw and the block moving down to open. The barrel is mounted in a long ring cradle with the trunnions just forward of the breach. The recoil system (buffer and recuperator) is mounted on the cradle above the barrel. Compression balancing gear is attached behind the saddle support, passing through the complex shaped saddle to connect to the cradle just forward of the trunnions. This can be manually re-pressured by a pump below the breach. The breach has a projectile retaining catch to prevent the shell sliding out at higher elevations before it is rammed with a manual rammer. Top traverse totals 60° and the vertical elevation range in -5° to 50°. Box girder section split trail legs are hinged to the cradle support, with bolts to lock them into either the open or closed position. The cradle support also has a bolt for locking the barrel in centre for traverse before towing the gun. There are small spades at the end of each trail leg, and fittings for large spades that are carried on the side of each trail leg. The large spades are used on soft ground and are fitted to the trail ends via have a pintle in the same way as the similar spades on M-46. These spades are the main difference from the D-20 carriage. To assist with all-round carriage traverse, there is a pivot jack mounted at the front of the cradle support. The pivot jack is not a sole plate and the gun fires with its foam filled rubber tyred wheels supporting the gun on the ground. When the gun is brought into action the pivot jack is folded down and adjusted to be on the ground. If the requires large traverse, small jacks on each trail leg are rotated downwards, and the trails jacked up until the main wheels are lifted clear of the ground and the bogey wheels mounted on each trail leg swung downwards and the trail jacks raised, the carriage is then traversed, and the trail jacks re-used to lift the bogey wheels and then place the piece back on its main wheels. The pivot jack is also used to secure the barrel against vertical movement when the gun is being towed. The barrel is locked in centre for traverse with a bolt on the cradle support. The jack is folded upwards, lugs on the ring cradle engage the jack base and two tensioners fixed to the saddle support are hooked to the cradle, these are tightened to lock the cradle onto the jack base. As was normal for the period the gun has a shield, including a folding piece below the cradle support. The centre section of the upper shield both slides up and down and folds to accommodate the barrel at higher elevation angles of fire. The shield may offer some protection against muzzle blast to the sights and layer, although it is usually shown being fired with a long lanyard, but is probably mostly for defence against machine gun fire. The non-reciprocating sights are designed for one-person laying. Included are a direct fire anti-tank telescope (OP4M), a panoramic periscopic indirect-fire sight, a dial sight, (PG1M), an angle of sight scale, and a range drum for the single charge engraved with the range (distance) scale, coupled to an elevation levelling bubble mounted on dial sight mount. The range drum enables the standard Soviet technique of semi-direct fire when the piece is laid visually on the target and the range set on the range drum. The gun fires separate ammunition using a metal cartridge case that also provides obturation. The ammunition is different to that used with 122 mm howitzers. There is a single charge without increments. The shell weight is 25 kg with a muzzle velocity of 900 m/s although the slightly lighter APHE shell has a higher muzzle velocity. Maximum rate of fire is usually stated as six rounds per minute. The detachment was either eight or nine men, probably differing between armies and period. In Soviet service the 5,600 kg gun was usually towed by a URAL-375 6×6 truck, AT-S or AT-L medium tractor in some regions.


Operators

* * * * * — In service as of January 2019. * * * * *


Former operators

* * * * * * * *


References


External links


TYPE 60 122MM TOWED GUN


{{SovArtyColdWar 122 mm artillery Field artillery of the Cold War Artillery of the Soviet Union Motovilikha Plants products