Combat Engineer Vehicle M728.

The stubby 165mm gun, crane boom on the turret, and dozer blade are striking features of the M728. A. Brush guard, headlight. B. Personnel heater exhaust outlet. C. 165-mm gun tube. D. Searchlight. E. M19 commander's cupola. F. Hook, winch cable. G. Boom travel lock. H. Boom. J. Engine air cleaner. K. Rear fender stowage box. L. Front fender stowage box. M. Headlight. N. Moldboard. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728 in De Soto, Missouri.

The headlight clusters and their brush guards have been extended to clear the dozer blade. The gunner's telescope M105F would peer through the aperture visible of this side of the gun shield.

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Combat Engineer Vehicle M728.

The crane boom extended over the rear deck when stowed. A. Taillight. B. Rear grille doors. C. External handset box. D. Bustle rack, stowage. E. Rear fender stowage box. F. Engine air cleaner. G. Boom linear actuating cylinder. H. Front fender stowage box. J. Compensating idler wheel. K. Track support roller. L. Roadwheel and hub. M. Drive sprocket. N. Track. P. Tow eye. Q. Tow pintle. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728 in De Soto, Missouri.

A similar angle to the above diagram is shown of an actual machine.

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Combat Engineer Vehicle M728.

Some internal components are sketched here. A. 7.62-mm machine gun. B. Gunner's periscope. C. Caliber .50 machine gun barrel. D. Commander's periscope. E. Commander's gun elevating and turret traversing control. F. Winch control. G. Boom control. H. Commander's observation seat. J. Radio equipment. K. Ammunition stowage rack. L. Commander's seat. M. Commander's platform. N. Portable fire extinguisher. P. Gunner's seat. Q. Turret platform. R. M150 gun mount. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The top of the vehicle is shown here. A. Driver's hatch. B. Driver's vision block. C. Searchlight mount. D. Gunner's telescope port. E. Personnel heater exhaust outler. F. Smoke grenade launchers (late model). G. Gunner's periscope. H. Cupola vision block. J. Commander's hatch. K. Smoke grenade stowage boxes (late model). L. Winch gearshift lever. M. Turret ventilating blower cover. N. Bustle rack, stowage. P. Winch. Q. Boom stayline. R. Winch cable. S. Antenna mount. T. Loader's hatch. U. Loader's periscope cover. V. Searchlight power receptacle. W. Snatch block. X. 7.62-mm machine gun port. Y. Moldboard locking hook handle. Z. Fire extinguisher release handles. AA. Lifting chain. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728 in De Soto, Missouri.

Details of the attachment of the boom to the turret and the linear actuating cylinder are shown in this picture.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

The maximum height the boom cable hook could reach was 16.5' (503cm) above the ground.

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Combat Engineer Vehicle M728 belonging to the Patton Museum of Cavalry and Armor.

The boom bracing is shown here, along with the location of the turret bustle winch and tow cable stowage. The turret is reversed on this vehicle, and it is also covered by a tarp.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

The hydraulic winch was operated from the commander's station.

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Combat Engineer Vehicle M728 belonging to the Patton Museum of Cavalry and Armor.

The winch pulley at the end of the boom is detailed here.

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Combat Engineer Vehicle M728 belonging to the Patton Museum of Cavalry and Armor.

Details of the hydraulically-operated dozer blade are shown here. Note that the headlight groups have been extended to shine over the retracted blade. The tank mounting bulldozer M9 was essentially the M48A2's M8A1 bulldozer modified to fit the M60. The moldboard could be positioned from 10" (25cm) below ground level to 30" (76cm) above ground; carry position was 29" (74cm) above ground level and rate of lift was 2.5"/sec (6.4cm/sec) at 1100 engine rpm.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

Lower-hull connections for the dozer moldboard are shown in this picture. The lift cable can be seen attached to the near side of the rear of the moldboard. Hydraulic cylinders pushed down on the beam at the bottom to lower the moldboard into the ground.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

The moldboard is on the left of this image, and the extended headlight clusters and hydraulic cylinder housings can be seen on the hull to the right. The tilt arm connects to the top rear of the moldboard and would swing forward as the moldboard is lowered.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

Mounting points for an infrared searchlight can be seen above the main gun, and a smoke grenade launcher is positioned on the turret front. The maximum and minimum lengths of recoil for the M165 gun were 13.5" (34.3cm) and 8.75" (22.2cm), respectively.

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Combat Engineer Vehicle M728 in De Soto, Missouri.

Fittings on the hull front are detailed here, including the extended headlights, dozer hydraulic cylinders, and lifting chain stays. The handle on the far side was the opearting handle for the moldboard's carrying hooks.

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Combat Engineer Vehicle M728.

The driver's position is shown here. A. Steering control. B. Brake pedal. C. Accelerator pedal. D. Transmission shift control. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

A. Driver's hatch control. B. M27 periscopes. C. Headlight dimmer switch. D. AN/VVS-2 night vision viewer or M24 infrared periscope. E. Manifold heater switch (on end of purge pump handle). F. Purge pump handle. G. Driver's seat height adjustment lever. H. Driver's seat dump lever. J. Forward-rear adjustment lever. K. Escape hatch lever.

The purge pump handle puged air from the engine fuel system when pumped up and down. The driver's seat dump lever dumped his seat to allow access to the floor escape hatch. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The right side of the driver's compartment is drawn in this image. A. Speedometer, odometer. B. Powerplant warning lamp. C. Domelight switch. D. Hydraulic pump switch and indicator. E. Intercom control box. F. Indicator panel. G. Master control panel. H. Generator switch. J. Accelerator lock lever. K. Smoke generator switch and indicator. L. Heater air outlet door. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The commander's position is the focus of the next set of images. A. Intercom control box. B. Searchlight remote control box. C. Commander's control handle. D. Cupola power switch. E. Grenade launcher switch. F. Grenade power switch.

The control handle allows the commander to override the gunner's inputs when in power mode. When the smoke grenade system is powered on, pressing one of the grenade launcher switches would fire 3 grenades from each discharger. Pressing both switches fired all the grenades. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

A. Firing switch. B. Winch control. C. Boom control.

The firing switch on the commander's control handle enabled the commander to fire the 7.62mm MG or the 165mm gun, depending on the gunner's switch box setting. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The rear of the commander's position is shown here. A. Receiver-transmitter. B. Audio frequency amplifier AM 1780/VRC. C. Observation seat lock handle. D. Domelight switch. E. Blower switch. F. Gas particulate air heater switch. G. Battle override switch.

The battle override switch restored communications power if the circuit breaker opened during battle. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

This drawing is looking up into the commander's position. A. Caliber .50 machine gun elevation handle. B. Caliber .50 machine gun trigger switch. C. Caliber .50 machine gun access door. D. Gun electrical safety switch (late model). (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

A. Headrest adjust lever. B. M36 periscope. C. Unity power window. D. Light source control. E. Gun electrical safety switch (early model). F. Cupola traversing control handle. G. IR body diopter ring. H. IR body. J. Ballistic shield control. K. IR switch. L. IR body and daylight body deflection knobs. M. IR body elevation knob. N. Daylight body elevation knob. P. Daylight body diopter ring. Q. Daylight body. R. Cupola azimuth lock and interlock. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The gunner's controls are sketched here. A. Main gun switch. B. Machine gun switch. C. Elevation/traverse power switch. D. Manual traverse handle. E. Gunner's power control handles. F. Firing triggers. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

This is the breech of the 165mm gun M135. The cradle and port for the coaxial machine gun are visible to the main gun's left, but the machine gun is not mounted in this drawing. A. Breech operating handle. B. Plunger to release breech operating handle. C. Release lever. (Picture from TM 9-2350-222-10-1.)

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Combat Engineer Vehicle M728.

The different types of engine air cleaners are illustrated here. Top loading air cleaners were introduced to the M60A1 in 1971, and they were armored beginning in January 1977. (Picture from TM 9-2350-222-10-1.)

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Last updated 7 Dec 2017.
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© Copyright 2001-17 Chris Conners