| M728: General | |||
| Date of first acceptance | 1965 | Total acceptances | 291 |
| Manufacturer | Detroit Tank Arsenal | Crew |
|
| M728: Dimensions | |||
| Combat weight | 117,400lbs 53,250kg |
Height (lowest operable) | 128.23" 325.70cm |
| Length with boom and dozer in travel position | 350.8" 891.0cm |
Gun overhang forward | 0" |
| Width over dozer | 146.0" 370.8cm |
Tread | 115.0" 292.1cm |
| Ground clearance | 15" 38cm |
Fire height | 82.6" 210cm |
| Turret ring diameter | 85.0" 216cm |
Ground pressure, zero penetration | 12.8psi .899kg/cm² |
| M728: Armament | ||||||
| Type | Mount | Ammunition | Traverse | Max traverse rate | Elevation | Max elevation rate |
| 165mm Gun M135 | M150 in turret | 30 rounds (9 ready) |
360° (manual and hydraulic) |
9.6°/sec | +20° to -10° (manual and hydraulic) |
4°/sec |
| .50cal M85 MG | Cupola M19 on turret | 728 rounds (188 ready) |
360° (manual) |
-- | +54° to -10° (manual) |
-- |
| 7.62mm M73, M219, or M240 MG | Coaxial to 135mm gun | 3,600 rounds (2,200 ready) |
360° (manual and hydraulic) |
9.6°/sec | +20° to -10° (manual and hydraulic) |
4°/sec |
| Aiming equipment | ||||||
| Telescope M105F and periscope M32C for gunner; periscope M34 or M36 for commander | ||||||
| Night vision | ||||||
| Infrared periscope M24 for driver, infrared periscope M32C for gunner, infrared periscope M36 for commander | ||||||
| M728: Armor | ||
| Assembly | ||
| Welding | ||
| Hull | ||
| Cast homogeneous steel | ||
| Location | Thickness | Angle from vertical |
| Upper front | 4.29" 10.9cm |
65° |
| Lower front | 5.63" to 3.35" 14.3cm to 8.51cm |
55° |
| Sides | 2.9" to 1.41" 7.4cm to 3.58cm |
0° to 45° |
| Exhaust grille | 1.0" 2.5cm |
0° |
| Lower rear | 1.6" to 1.2" 4.1cm to 3.0cm |
30° to 60° |
| Top | 1.41" 3.58cm |
90° |
| Front floor | 0.75" 1.9cm |
90° |
| Rear floor | 0.5" 1.3cm |
90° |
| Turret | ||
| Cast homogeneous steel | ||
| Location | Thickness | Angle from vertical |
| Gun shield | 5.0" 13cm |
60° |
| Front | 10.0" 25.4cm |
0° |
| Sides | 5.5" 14cm |
0° |
| Rear | 2.25" 5.72cm |
0° |
| Top | 1.0" 2.5cm |
90° |
| M728: Automotive | |||||
| Engine | Continental AVDS-1790-2D; 12 cylinder, 4 cycle, 90° vee, supercharged diesel | ||||
| Horsepower | Net: 643@2,400rpm Gross: 750@2,400rpm |
Torque | Net: 1,575 ft-lb@1,750rpm Gross: 1,710@1,800rpm |
Fuel capacity | 385gal 1,460L |
| Transmission | General Motors CD-850-6A, 2 ranges forward, 1 reverse | ||||
| Steering | Mechanical, T-bar | ||||
| Brakes | Multiple disc | ||||
| M728: Suspension | ||
| Type | Road wheels | Track return rollers |
| Torsion bar | 6 independently sprung dual/track | 3 dual/track |
| Drive sprockets | Idlers | Shock absorbers | 11-tooth rear drive | Dual compensating at front of track | On first 2 and last road wheels/track |
| M728: Track | |||||||
| T142 | |||||||
| Center guide, double pin, replaceable rubber pad | |||||||
| Width | 28" 71cm |
Pitch | 6.94" 17.6cm |
Shoes/track | 80 | Ground contact length | 166.72" 423.47cm |
| M728: Performance | |||
| Max level road speed | 30mph sustained 48kph sustained |
Max trench | 99" 250cm |
| Max grade | 60% | Max sideslope | 30% |
| Max vertical obstacle | 30" 76cm |
Min turning diameter | Pivot |
| Max fording depth | 48" 120cm |
Cruising range | ~280mi ~450km |
The M728 was based on the M60A1 tank. The 105mm gun was replaced by the 165mm demolition gun cannon M135, which was a modified version of Britain's L9A1 weapon. Changes to the ordnance included omission of the bore evacuator, a manual instead of semiautomatic breech, and the breech bushing was combined with the gun tube. The M135 also had a new obturator, breechblock latch, and firing mechanism. The gun mount M150 was a modified version of the M140 mount found on the regular M60A1 tank. An hydraulic dozer blade M9, the standard dozer for the M60 tanks, was mounted on the front hull. An A-frame boom was installed on the front of the turret which folded to the rear when it was not in use, and allowed loads of up to 17,500lb (7,940kg) to be hoisted with a single line or 35,000lb (16,000kg) with a double line. Also included in the design was a turret bustle-mounted hydraulic winch with a horizontal single line capacity of 25,000lb (11,000kg) and a double line capacity of 50,000lb (23,000kg).
