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 Post subject: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 10:58 am 
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Surplus Ammunition's Master
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We didn't replace any springs on artillery Guns. But the barrels needed replacing a lot. The 175mm howitzer required the barrel replaced after 1,200 with a full charge three firings. The 8" howitzer was the charge seven, the total (I'm getting old, I forget the number) had to have the barrel replaced. I know that 8th Battalion,4th Field Artillery, XXIV Corps Artillery had fired >400K rounds on her tour in Vietnam, with 12 howitzers.

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Service Battery out to change 4th section 175mm tube at LZ Sally just northwest of Hue, Feb. 1971.


:shock:

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 11:16 am 
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The breach is still on the old barrel on the ground in picture #1, while cleaning the bronzes slides. The locking keys are removed, the breach is rotated counterclockwise till it's off the threads of the old barrel. Then the breach is lowered down and aliened for the breach to be rotated onto the new barrel.

On picture #2, shows the 4th section driver is cleaning the slides and the pair of pneumatic elevation lifters. Before the new barrel is slid on the gun, the driver drives forward as the two cranes holds the barrel horizontal with the gun. Fun!

:D

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 12:15 pm 
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Big guns, big tools, big job. Imagine changing out a 16" Naval Rifle. :?:

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 12:23 pm 
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Yep, that was the last of long barrel artillery age.

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 4:51 pm 
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Now that is some incredible stuff to be doing out in the field :shock:

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 6:13 pm 
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Ken, how long did it take to change out a 175 tube?


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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Tue Jan 31, 2017 7:40 pm 
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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Wed Feb 01, 2017 7:31 am 
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dvl wrote:
Ken, how long did it take to change out a 175 tube?


2-3 hours even in the lite rain.

;)

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 Post subject: Re: 175mm barrel changing at LZ Sally
PostPosted: Wed Feb 01, 2017 7:42 am 
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Matting the Barrel and Breech together.

The barrel is held horizontally and a strap is wrapped around the breech several times and lifted up and we pushed the breech onto the threads of the barrel as the crane takes up the tension in the nylon strap. The breech rotates back onto the barrel threads till it's all the way on. Then add the key locks back in place to lock the breech from becoming loose.

[Question]What were your experiences with the accuracy of the 175? I've mentioned in previous threads that the guns at Camp Carroll fired in support of us at Khe Sanh but that was, as I was told, near the limit of their range, and atmospheric conditions significantly affected their accuracy. So much so that some fire missions where they could have been very helpful were declined because conditions were not good.

I do know that the 8" howitzer was the most accurate artillery piece the Army had. The 175mm was more like MOA minute of acre.

30' vs, ~100 yards if I remember correctly. But you need to remember the range is much different as well, 175mm almost 18 miles, where as the 8" closer to 12 mile range. The rounds weighed in at 149lbs. vs. 204 lbs. for the 8" howitzer.
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The power bag on a 175mm zone three full charge was 49" tall. While the 8" powder bag was only 28" long with being full change 7.
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:D

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