155mm Self-propelled Howitzer M109 in Vietnam.

The M109 used the same turret and hull as the 105mm SPH M108. The muzzle brake and bore evacuator on the short M126 or M126A1 howitzer are obvious. The howitzer travel lock is folded down on "Bouncer's" front plate, and the .50cal MG is mounted on the turret roof. The two hatch doors on the sloping front plate above the drive sprocket were for battery access, and the travel lock is resting on the transmission access doors. The turret left side door is open, and the mushroom-like ballistic cover for the M117 panoramic telescope is elevated on the turret roof. (Picture by Jon W. Madzelan.)

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155mm Self-propelled Howitzer M109A2.

Details of the front of the vehicle are shown here. 1. Cannon and howitzer assembly. 2. Travel lock assembly. 3. Headlight. 4. Final drive drain plug. 5. Engine oil level check access door. 6. Front lifting eye. 7. Front towing eye. 8. Bilge pump outlet. 9. Drive sprocket and hub. 10. Road wheels. 11. Track assebmly. 12. Hull. 13. Cab. 14. Cab side door. 15. Commander's cupola. 16. M2 caliber .50 machine gun. 17. Panoramic telescope ballistic cover. 18. Cab weather cover. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

The rear of the howitzer is sketched here. 19. Projectile access door. 20. Cab lifting eye. 21. Bustle door. 22. Rear lifting eye. 23. Exhaust deflector. 24. External power receptacle (M109A4/M109A5). 25. Idler wheels. 26. Stoplight and blackout light. 27. Towing pintle assembly. 28. Rear hull door. 29. M13 decontamination apparatus. 30. Reel bracket. 31. Spade. 32. Stowage box. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

The top of the howitzer is sketched here. 33. Air intake grille. 34. Radiator fan access door. 35. Exhaust grille. 36. Radiator cap access door. 37. Personnel heater exhaust deflector. 38. Fuel tank access door. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

39. Cab access cover. 40. Gunner's escape hatch. 41. M140 alignment device mount. 42. Fire extinguisher handle. 43. Personnel air vent ventilator. 44. Driver's hatch cover. 45. Battery compartment access doors. 46. Transmission access doors. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

Major internal hull components are detailed in this picture. 1. Coolant surge tank. 2. Fuel tank and pumps. 3. Air cleaner. 4. Personnel heater. 5. Fixed fire extinguisher. 6. Canister stowage. 7. Projectile racks. 8. Accessory control box. 9. Driver's seat assembly. 10. Portable and driver's instrument panels. 11. Driver's controls. 12. M2A2 air purifier (M109A4/M109A5). 13. Battery. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

The left front of the cab is drawn here. 1. Operating handle (breech mechanism). 2. Dome light switch. 3. Rammer actuating valve control handle. 4. Firing mechanism manual control lever. 5. Rammer handle. 6. Turret lock. 7. M3 electrical air heater (M109A4/M109A5). 8. Accessory control box. 9. Manual traverse handwheel. 10. Gunner's control assembly handle. 11. Gunner's selector switch box assembly. 12. Equilibration handpump assembly. 13. M145/M145A1 telescope mount. 14. M117/M117A2 panoramic telescope. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

The rear of the cab is drawn here. 8. Power pack assembly. 9. External filter (M109A4/M109A5). 10. Air line filter and hygroscopic breater (M109A4/M109A5). 11. Cab ammunition rack assembly. 12. Canister rack propellant. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

This is the driver's position. 1. M42 driver's periscope. 2. Hatch locking lever. 3. Fuel shut off control assembly handle. 4. Master warning light. 5. Fire extinguisher handle. 6. Transmission shift control lever. 7. Manual control handle [used to engage parking brake]. 8. Hand throttle control lever. 9. Accelerator pedal. 10. Driver's heater outlet duct. 11. Driver's seat vertical adjusting lever. 12. Brake pedal. 13. Steering wheel. 14. Driver's fixed instrument panel. 15. M3 electrical air heater (M109A4/M109A5). 16. Dome light switch. 17. Portable instrument panel [used when driver is in raised position]. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

Suspension components are diagrammed here. 1. Torsion bar anchor. 2. Torsion bar. 3. Road wheel arm. 4. Road wheel. 5. Shock absorber. 6. Bump stop. 7. Idler arm assembly. 8. Idler wheel. 9. Track adjuster. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2.

The mounted crew positions are shown here. HD: howitzer driver. AG: assistant gunner. G: gunner. 1-3: cannoneers. CS: chief of section. AVD: ammo vehicle driver. ATC: ammo team chief. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A2 in Fort Dix, New Jersey.

The large howitzer and imposing muzzle brake of this M109A2 stand out. The travel lock mounting point was moved down to the extreme front with the installation of the longer howitzers. The mount for the .50cal M2HB machine gun is visible on the turret's right side, and the new protective ballistic hood for the panoramic telescope M145 is on the turret's left, facing to the right. (Picture courtesy Armor Foto.)

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155mm Self-propelled Howitzer M109A2 in Fort Dix, New Jersey.

This rear view shows the lengthened turret bustle, which is flanked on either side by stowage racks. The stabilization spades are folded up on either side of the hull rear. (Picture courtesy ArmorFoto.)

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155mm Self-propelled Howitzer M109A3.

The turret stowage bustle and commander's cupola hatch are open on this vehicle, and the stabilization spades are lowered. (Photo by Richard S. Eshleman.)

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155mm Self-propelled Howitzer M109A4.

The locations for the 13 drains added to the M109A4 are marked as 1. Cover plates for hull access holes are labeled as 2. (Picture from TM 9-2350-311-10.)

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155mm Self-propelled Howitzer M109A6 Paladin in Fort Stewart, Georgia.

The widened bustle on the M109A6 is obvious when compared to the vehicles above. The stowage bins on the outside of the bustle can be swung to the rear to decrease the vehicle's width. (Picture taken 19 Mar 1999; available from the Defense Visual Information Center.)

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Last updated 22 Aug 2016.
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© Copyright 2001-16 Chris Conners