| M74: General | |||
| Date of first acceptance | February 1954 | ||
| Manufacturers |
|
Crew | 4 men |
| M74: Dimensions | |||
| Combat weight | 93,750lbs 42,530kg |
Height | 133.5" 339.1cm |
| Length | 313.0625" 795.1788cm |
Width | 121.8125" 309.4038cm |
| Tread | 88" 224cm |
Ground clearance | 15.5" 39.4cm |
| Ground pressure | 13.5psi .948kg/cm² |
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| M74: Armament | ||||
| Type | Mount | Ammunition | Traverse | Elevation |
| .50cal M2HB MG | Flexible in AA mount | 1,050 rounds | 360° (manual) |
Manual |
| .30cal M1919A4 MG | Ball mount in right bow | 2,000 rounds | 20° left, 25° right (manual) |
+20° to -10° (manual) |
| M74: Armor | ||
| Assembly | ||
| Welding | ||
| Hull | ||
| Rolled and cast homogeneous steel | ||
| Location | Thickness | Angle from vertical |
| Upper front | 2.5" 6.4cm |
47° |
| Lower front | 4.25" to 2.0" 10.8cm to 5.1cm |
0° to 56° |
| Sides | 1.5" 3.8cm |
0° |
| Rear | 1.5" 3.8cm |
10° to 22° |
| Top | .75" 1.9cm |
83° to 90° |
| Front floor | 1.0" 2.5cm |
90° |
| Rear floor | .50" 1.3cm |
90° |
| M74: Automotive | |||||
| Engine | Ford GAA; 8 cylinder, 4 cycle, 60° vee gasoline | ||||
| Horsepower | 525 | Fuel capacity | 168gal 636L |
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| Transmission | Synchromesh, 5 speeds forward, 1 reverse | ||||
| Steering | Controlled differential, steering levers | ||||
| Brakes | Mechanical, external contracting | ||||
| M74: Suspension | ||
| Type | Road wheels | Track return rollers |
| Horizontal volute spring | 3 bogies/track; 2 dual wheels/bogie |
2 dual/track, 3 single/track |
| Drive sprockets | Idlers | Shock absorbers | 13-tooth front drive | Dual adjustable at rear of track | One on each bogie |
| M74: Track | |||||||
| T66 | |||||||
| Center guide, single pin, cast, steel | |||||||
| Width | 23" 58cm |
Pitch | 6" 15cm |
Shoes/track | 79 | Ground contact length | 151" 384cm |
| T80 | |||||||
| Center guide, double pin, rubber and steel | |||||||
| Width | 23" 58cm |
Pitch | 6" 15cm |
Shoes/track | 79 | Ground contact length | 151" 384cm |
| T84 | |||||||
| Center guide, double pin, rubber | |||||||
| Width | 23" 58cm |
Pitch | 6" 15cm |
Shoes/track | 79 | Ground contact length | 151" 373cm |
| M74: Performance | |||
| Max level road speed | 21mph sustained 34kph sustained |
Max trench | 90" 230cm |
| Max grade | 60% | Max vertical obstacle | 24" 61cm |
| Min turning diameter | 74' 23m |
Max fording depth | 36" 91cm |
| Radius of action | ~100mi, roads ~160km, roads |
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The TRV M74 was developed after the outbreak of the Korean War since the World War II-era tank recovery vehicles then in use could not cope with the heavier modern tanks. M74 was converted from stocks of medium tanks M4A3 and M32B3 tank recovery vehicles, to which it bore a strong resemblance. The sixty M32B3-based M74s were designated M74B1. The M74 had a front-mounted A-frame crane which could swing to the rear over the flat-sided turret when not in use, much like the crane on the M32 series. There was a 25,000lb (11,000kg) capacity winch threaded through the boom, a port for the 90,000lb (41,000kg) tow winch on the hull glacis, a 10,000lb (4,500kg) auxiliary winch on the turret front, and also a 2,000lb (900kg) manual utility winch used to manipulate the tow bar stowed at the rear. The boom winch was fitted with 150' (46m) of .875" (2.22cm) cable with a breaking strength of 65,800lb (29,850kg). The tow winch had 200' (61m) of 1.25" (3.18cm) cable with a breaking strength of 132,400lb (60,060kg). The auxiliary winch was provided with 400' (120m) of .5" (1.3cm) cable with a breaking strength of 22,000lb (10,000kg). M74 also had a spade mounted on the front of the tank, used for stabilization and as a dozer blade, which was raised and lowered using the auxiliary winch. Vehicle height to the top of the turret roof was 122.5" (311.2cm). The final drive ratio was modified from the M4A3's 2.84:1 to 3.36:1.
