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Semovente da 75/18, Part 1 

 
 

Picture 1: 
There were a couple of 
Italian designs created to 
take advantage of their 
M 13/40 tank chassis as 
a basis for other armored 
vehicles. One of these 
was very successful and 
mated the 75/18 Gun 
Howitzer Modello 34 in 
a fixed superstructure to 
the tank chassis, creating 
the Semovente da 75/18. 
Since these first vehicles 
were built on the M 
13/40 chassis, they were 
officially named Su 
Scafo M 40, but after a 
few had been built, the 
14/41 tank chassis went 

into production and this become the basis for many more Semovente vehicles. Towards the end of production, the M 15/42 
tank chassis was also used, the resulting Semovente called "Semovente da 75/18 Su Scafo M 42".  
 
This particular vehicle is one of the first series based on the M 40 chassis. One of the ways to tell the difference between those 
Semovente based on the M40 and those on the M41 chassis is to check the track guards. Most of the M 40 tank chassis only 
had partial coverings over the tracks, normally covering just the front portion of the track run, like you see here. The M 41 
chassis with the larger engine was built with complete track covers, so the track guards typically run the length of the vehicle 
from front to back.  
 
 

Picture 2: 
Credit for the original 
Semovente design goes 
to an artillery colonel 
named Berlese, and only 
a few days after the 
design was presented to 
Ansaldo Fossati of 
Genoa, the 
manufacturing company 
was able to produce a 
wooden mockup. It was 
successful enough that 
an initial order for thirty 
vehicles was placed, and 
once the prototypes were 
accepted, full-scale 
production was begun in 
mid 1941 with an 
increased order now for 

sixty vehicles based on the M 13/40 chassis. During 1942 many more vehicles were manufactured, mostly on the M 14/41 
chassis with its larger engine, and these were called Semovente da 75/18 su Scafo M 41. As I mentioned earlier, the last version 
was the M 42 version, with an even larger engine and a slightly enlarged chassis. By the way, the '18' in '75/18' refers to the 

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length of the gun, L/18.  
 
This is a Semovente da 75/18 captured in the desert fighting. It is based on the M 41 tank chassis as you can tell by the full-
length track guards. Note the ammo rounds on the fender.  
 
 

 

Picture 3: 
The British captured a Semovente in the early stages of their fighting with the Italians and brought it home for study at the 
Tank Technology School. The vehicle was a su M 13/40 type, and the report that was produced from the study contains some 
interesting drawings and photographs. This is the side view of the early machine, showing how it was divided up into two 
compartments, the fighting in the front and the engine in the rear. Although the engine was mounted in the rear, the tracks were 
driven by front sprockets via the transmission in the front, so a drive shaft cuts the crew compartment in half on its way from 
the engine to the transmission. The engine is a SPA Modello M 13(8T), and is water-cooled via a radiator mounted at the very 
rear of the engine compartment. The engine is a V-8 diesel type, developing around 105bhp at 1800rpm. At the front of the 
Semovente is the Fiat-built 8 F2 transmission, utilizing a splined shaft and sliding gears. There are four forward and one 
reverse speeds available from the gearbox. The steering unit attached to the front of the transmission is a conical gear 
combination, with two epicyclic gears, pretty much standard at this time for AFVs.  
 
 

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Picture 4: 
Crew in the Semovente consisted of three men, a commander/gunner, a loader/radio operator, and a driver. The driver sat in the 
front-left, next to the gearbox, the commander/gunner to the right of the gearbox, and the loader radio operator on an ammo 
box seat next to the left sponson, behind the driver. This over-head drawing shows the general layout of the vehicle with 
gearbox and steering unit at the front, open fighting compartment in the middle, and engine/radiators in the rear. There was a 
bulkhead between the engine and crew, but part of the front of the engine stuck out into the fighting compartment. The oil bath 
air filters for the engine were located on the firewall in the fighting compartment, and you can see them represented here by the 
circles with pipes leading back to each cylinder head. The vehicle batteries were also located with the crew, on the floor at the 
right-rear corner. Notice how the exhaust pipes exit the engine compartment walls and then turn before mufflers are attached 
above the track guards.  
 
 

Picture 5: 
This TTF 
drawing is very 
detailed, but also 
very busy. We 
will look more 
closely at it in a 
few minutes, but 
for now notice 
the general layout 
of the vehicle. 
The driver has the 
most comfortable 
seat in the house, 
and forward and 
to the sides are 
his traditional 
steering levers. 
The steering box 
is located at the 
very front of the 
tank, and the 
brake bands for 
each sprocket are 

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shown. These 
were controlled 
by the steering 

levers, in effect, 
by pulling back on the lever on one side, the driver applied the brake on that side of the steering box, slowing the attached 
sprocket. The hot transmission sits right next to the driver, and you can see the gearshift lever and knob projecting just about 
horizontally out the back of the shift box unit.  
 
The big 75mm gun is mounted in a gimble mount relatively high in the vehicle near the ceiling, and some of the left side of the 
breech can be seen from here. Interestingly, the firing lever is on this side of the breech, even though the commander/gunner is 
on the other with his roof sights. On the back firewall are the two cylindrical oil bath air filters for the engine, and between 
them is a horizontal water reservoir tank for the radiator. You might also notice the two pistol ports on either side of the water 
tank. These are the typical round Italian type we have seen in their WWII tanks.  
 
 

Picture 6: 
A closer view 
of the front of 
the Semovente 
shows some 
additional 
details. The 
twin steering 
levers (9) are 
attached to the 
floor with 
control rods 
running 
forward to the 
epicyclic 
steering brakes 
(5) mounted 
right next to the 
track brakes (4) 
in the steering 
unit. The large 

box between the left and right sets of brakes is called a bevel box because it contains bevel gears that transfer the rotation of the 
gearbox drive out sideways to the brakes. The gearshift lever (25) is a bit clearer here as it curves over towards the driver's seat, 
and both the reduction gear lever (11) and the transmission brake lever (10) are also identified. Unfortunately, the reduction 
lever is partially hidden on the other side of the gear case, and the transmission brake lever is the vertical one well below the 
end of the identifying arrow.  
 
A couple of the foot pedals are visible between the driver's seat and steering box, with the clutch (8) on the left (our right). The 
accelerator pedal (24) is difficult to locate down in all that jumble. Wall off to the right side of the hull is a crank mechanism 
(2) that opens and closes the cooling vent doors located on the glacis armor above the steering box.  
 
 

Picture 7: 
Notice the 
firing lever on 
this side of the 
breech ring. A 
complicated 
series of rods 
and levers 
transfers the 
firing lever 

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action under the 
breech ring to 
the other side 
where the 
actual firing 
mechanism is 
located. I'm not 
sure why the 
Italian 
designers 
wanted the 
driver to be the 

one to fire the gun, unless they were concerned that the vehicle was pointed in the right direction, or something like that. The 
sight bracket (20) on the gunner's side of the weapon is devoid of sights, but if one was mounted it would protrude out the top 
of the roof through a small hatch at this location. Just a bit further back is the rounded hood of the gunner's general-use 
periscope, unfortunately drawn off the side of the roof instead of on top of the roof as it should be.  
 
Behind the gun is one of the pistol ports (15), the other one being on the far side of the radiator reservoir tank (17). Below the 
tank is the front end of the engine protruding through the bulkhead, and the L.P. fuel pump (19) is shown mounted to the top of 
the clutch housing. Off to the right side of the picture are the sockets and switches for the radio headset (14), and directly below 
the air filter on this side of the vehicle is the radiator and fan for the transmission cooling system. There are a couple of 75mm 
ammo boxes shown on the right side of the floor, but the one located on this left side has not been drawn. All combined, there 
were 44 rounds of 75mm ammo carried aboard of two basic types, Granata da 75/13 Mod 32, weighing 14lbs (6.36kg) and a 
length of 13.5in (34.1cm), and Granata perforata da 75, weighing 13.9lbs and having a length of 12.25in (31cm). Most of the 
secondary weapon ammo was stored in slotted boxes up on the sponsons and near the ceiling, but none of those boxes have 
been shown in this drawing.  
 
 

Picture 8: 
This rather poor representation of the left 
side of the hull still provides some 
information. The driver's large instrument 
panel is mounted vertically on the sponson 
to his left, with a periscope mounted in the 
roof in front of him for use when the 
hatches are closed. Behind the periscope, 
but on the gunner's side of the roof, are his 
sight hatch, and general viewing periscope.  
 
On the left track sponson behind the 
instrument panel sits the radio system, with 
both a transformer and the typical Magneti 
Marelli RF 1 CA. Shown on the rear wall 
is one of the two oil bath air filter 
canisters, below which is the transmission 
radiator and cooling fan. The left side 

ammo bin is also included in the drawing, holding what looks like 14 75mm rounds. I suspect this was the seat for the third 
crewmember, the loader, who probably also operated the radio when the commander was working the gun. It is quite possible 
that the commander did not lay and fire the weapon, but had a gunner to do that for him while he manned the radio. This 
arrangement makes more sense, but remember that in Italian tanks the commander was traditionally also the gunner. The idea 
of freeing up the commander to actually command the other crew members had not quite taken root for the Italians during the 
war.  
 
 

Picture 9: 
This is just another general location drawing, this 
time for the rear of the firewall. The front of the 

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clutch housing for the engine is again seen here. 
Notice that there is some space between it and the 
bulkhead; this was not an air tight fit, and I really 
should not call this bulkhead a firewall, because it 
certainly was proof against engine fires. To our left 
are the vehicle batteries, which were about small 
enough to fit under the air filter hanging on the 
bulkhead, but are usually hidden by the large ammo 
bins in front of them.  
 
The Magneti Marelli radio is shown up on the left 
track sponson again, but for some reason the dynamo 
is now drawn down on the floor. Notice the radiator 
reservoir on the wall above the engine. The filler is 

shown on the front of the tank here, while earlier it 
was on the right end. Notice that the artist has omitted the firing ports on this back wall that should be on either side of the 
water tank. Although the ports were poorly designed, they were the only way the crew could look out the back of the 
Semovente.  
 
 

Picture 10: 
The cross-section 
views show the 
radiator/cooling 
fans at the far rear 
of the vehicle as 
well as the engine 
compartment. In 
both cases we are 
looking forward, 
as if the rear armor 
has been removed 
and we can see 
inside the engine 

compartment. The fans are located under the radiators, pulling cooling air through the radiators from outside the vehicle before 
forcing it into the engine compartment just forward of the fans. A small water expansion tank is located between the radiators, 
at the high point on the sloping engine deck.  
 
Further forward is the V-8 diesel engine, here both the cylinder heads are clearly drawn along with the exhaust manifolds on 
the sides dumping exhaust out the sides of the hull. To the left is the fuel tank that holds around 28gal US (145l) and on the 
other side is an oil tank above and what appears to be more batteries below. Perhaps the batteries in the fighting compartment 
were for the radio set.  
 
 

Picture 11: 
Our last drawing of the interior of the Semovente 
75/18 is an over-head sketch again, but this time 
there is more detail provided. Note that the gearbox 
and drive shaft are just about on the center line of the 
hull, and the gearshift can be seen leaving the 
gearbox and curving to the rear on the center line. To 
the left of the gearbox, between it and the driver's 
seat, is a thin stowage box for some tools and vehicle 
manuals. To the left of the seat is the instrument 
panel up on the sponson, and once again the radio 
equipment is mounted to the same sponson. Note the 
ammo bin on the floor, and the transmission radiator 

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and cooling fan between the bin and the rear 
bulkhead. On the right side all that is drawn is are 
the two ammo bins and the anti-aircraft MG stowed 
on the right sponson. Up in front of the gunner's 
round seat is the crank for opening the cooling 
hatches on the front armor.  

 
 

Picture 12: 
With the two roof 
hatches opened we have 
a good view of the 
driver's area. His seat on 
the left is flanked by the 
steering levers angling 
forward, and if you use 
your imagination you 
might make out the thin 
storage box to the right 
of the seat used for 
stowing small tools and 
manuals. On the left side 
of the gun-howitzer 
breech ring is the firing 
lever mechanism, and 
over on this side is the 
breech lever on top of 
the ring. Forward and to 
the far right is the 
elevation and traverse 
gearbox with at least the 

traverse handwheel visible at the lower-right corner of the photo. Note the sight opening in the roof just forward of the open 
hatches we are looking through, the sight door opening seen at the upper-right corner of the picture.  
 
The driver has a fairly large forward viewing flap in front of him that can barely be see in the shadows, and to his left is the 
speedometer on the sponson, all by itself. The instrument panel is further back on the sponson, and in the shadows further back 
on the sponson is the radio equipment. This is an image that was published in the School of Tank Technology report on the 
Semovente, but this print is a copy of a copy, and unfortunately is not very clear.  
 
 

Picture 13: 
Another image from the TTF report illustrates the 
general layout at the front of the vehicle. The 
driver's seat is at the left and the gearbox to his 
right. Above and to the right of the gearbox is the 
gimbal mounting for the main gun, and to the right 
of that is the elevation gearbox. From this photo 
you can clearly see the breech handle on top of the 
breech ring. The small box on the sponson would 
hold tools and spare supplies for the MG that would 
normally be stowed on this sponson. Notice the 
roof periscope on the slanting portion of the roof 
that has not been removed for this picture. The 

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actual sights for the gun would rise up through a 
small hatch in the roof just forward of these hatch 
openings, but it is closed here and can't be seen. A 

connecting bracket would run between the sight 
mount and the gun mount, attaching to the right of the barrel, in front of the breech ring.  
 
 

Picture 14: 
The driver's controls and surrounding equipment are mostly 
visible in this photo. His steering levers are again pushed all 
the way forward, and the three pedals at this feet are also 
visible. The vision flap on the front armor is open here and a 
small intercom box is located to the lower left of the flap. 
The speedometer is sitting down on the sponson near the 
radio box, and to the left, at the far left of the picture, is the 
major portion of the instrument panel.  
 
To the right of the seat is that thin stowage box again, and 
then the gearbox is visible, although the gearshift is sticking 
out at a severe angle towards the driver's seat. The 75mm 
gun is to our right, and the firing lever is clearly seen. The 
Italians used system of boxes with small lights to help 
communicate between the commander and driver. The box 
for the driver, I think, is the wide white box with the four 

lights you see just above his vision flap opening. The 
commander would also have a small panel on his side of the vehicle with some switches, and before starting out they would 
agree on the light system (slow, fast, left, right, etc.).  
 
 

Picture 15: 
This little picture more or less confirms what we have seen 
before in the rear of the fighting compartment. The front of 
the engine and clutch case dominate the center of the 
bulkhead, and the two air filters flank it. Below the filter on 
our right is the transmission cooling radiator and fan, and at 
the upper right corner of the opening you can see the 
connection box for the radio equipment that was seen in the 
large sketch previously. Both the round pistol ports are 
visible, although if you didn't know what to look for, they 
might be hard to point out. The water tank is white and 
mostly washed out in this blurry print, but the general shape 
of the over-head hatches can be clearly seen, as well as their 
locking handles.  
 
Now that we have the vehicle design perimeters and general 

layout clear in our heads, it is time to get into a preserved Semovente in Part 2 and see how it looks from the inside.  
 
 

TO SEMOVENTE 75/18, PART 2

 

BACK TO AFV INTERIORS HOME PAGE

 

(c) 2003, AFV INTERIORS Web Magazine 

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Semovente da 75/18, Part 2 

 
 

Picture 1: 
The Semovente we will be spending some time in today is a Scafo M 42 model like the one pictured 
here. This is one of the last versions of the Semovente 75/18 to be built by Fiat-Ansaldo during the 
war. It was based on a new tank chassis (M 15/42) that was slightly longer and wider than the earlier 
design, and included a larger more powerful engine (note the air vents on the engine deck covers). 
But the same superstructure and other details were used during the conversion of these chassis to 
Semovente M 42, so the interior layout and equipment was also the same.  
 
Originally, these new Semovente M 42 vehicles were to be armed with the longer Italian 75/34 gun, 
but production commenced before the gun was available, so the first 200 had the original 75/18 
weapon, like the one shown here. Note the three water can holders on the side. This is something 
unique to the M 42 hulls, and makes them easier to identify from a distance or in period photos.  
 
 

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Picture 2: 
The images in this page were loaned to us by Mr. Pietro Podavini from Italy. Mr. Podavini has helped 
us at AFV INTERIORS a number of times over the years, especially when we need information about 
WWII Italian vehicles, and his contribution to the Semovente pages is greatly appreciated. We only 
have a few images to share, so I have made them fairly large to see the most detail.  
 
This is the vehicle that we will be exploring, a M 42 preserved in the Trieste collection in Italy. This 
particular vehicle has a gun barrel but is missing its breech ring, as you will soon see. But before we 
climb aboard, you should know one thing about that big 75mm gun barrel. The weapon actually 
consists of a loose barrel with a short jacket around it, as well as a locking ring and detachable breech 
ring. So what you see here is not the actual gun barrel, but an armored jacket that surrounds and 
protects the barrel. At this end of the barrel is what we used to call a "pepper pot" muzzle brake. It 
acts as both a muzzle brake and flash hider, but was of little consequence when fighting at night. The 
unique barrel design was common to all the Semovente 75/18 Model 34 gun-howitzers, from the M 
40 through the M 42.  
 
 

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Picture 3: 
The driver's position shows his two steering levers and their attachment brackets on the floor. The 
floor brackets show a ratchet at the top edge, indicating there is a locking mechanism to keep them in 
one position, and usually released by a button or lever at the handle. In this case, the lever you see on 
the handle will set the lock and the button will release it. Note that the black seat has been slid all the 
way back on its floor mount. Normally it would be up so the front of the seat cushion is about even 
with the steering lever brackets, depending on the length of the driver's legs, of course.  
 
The photo shows the gearshift lever on the Fiat gearbox coming out of the top of the case and 
crossing the picture to the left. The long reduction gear lever is also visible here, coming from the 
side of the gear case at the upper-right, and then angling toward us. Unfortunately, both levers have 
been painted black and tend to disappear in the shadows, or when crossing black painted equipment. 
The bottom corner of the instrument panel is visible at the upper-left corner of the photo.  
 
 

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Picture 4: 
The view over to the driver's left includes his vision flap and instrument panel. The flap is opened by 
a handle sticking up above the hinge at the left, but out of sight here. Notice that there is no vision slit 
in the flap, and no backing glass block. When in action, this flap must be shut and locked, and vision 
is available only via the over-head periscope, making a very restricted view. That is why the light 
system was used to communicate between the commander and driver, as the commander had a better 
view through his optics and rotating roof periscope.  
 
Below the vision flap is a black grab handle, and at the upper-left corner of the picture is part of a MG 
ammo storage bin. The lone speedometer gage that normally sits on the sponson to the left of the 
instrument panel is missing. Notice the nuts and angle iron used to join the superstructure armor 
plates.  
 
 

Picture 5: 
Along with the rest of the vehicle, the 
instrument panel obviously has been 
painted a few times since the war, but it 
was probably black as you see it here. I 
don't know what the various knobs are for, 
but someplace is the starter and a switch to 
control exterior and interior lights, and 
there are some fuzes at the lower right. If 
you happen to know what is on this panel, 
let us know.  
 
The first Semovente to see combat action 
were the early M 40 types comprising two 
self-propelled artillery gruppi of the Ariete 
Division in early 1942. At the time of their 
introduction in North Africa, their 
armament was formidable in comparison 
with both British and German tank guns. In 
North Africa, the Semovente 75/18 gruppi 
(battalions) were organized with a HQ 
battery and two gun batteries, normally 
with four Semovente guns and a command 
vehicle in each battery. Command 
Semovente (carri comando) were modified 
M 13 and M 14 tanks, usually turretless and 
armed with one or two machine guns 
mounted on the right hand side in the 

machine gun sponson. A gruppi, or battalion, of Semovente then typically had a total of eight 
Semovente SPGs along with four carri comando vehicles and perhaps as many as 30 supporting 
motorcycle troops.  

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Picture 6: 
The gunner's area in this old girl is just about as you would expect with the gun breech missing. The 
seat appears to be adjustable in height by rotating it on its mount. Notice the floorboards further 
forward that may lift off to allow stowing equipment underneath. The hand crank for opening the 
steering brake cooling hatches is still intact on the right sponson wall.  
 
The armor used on the Semovente was rolled homogeneous plate. The hull nose was 1.18in (30mm) 
thick while the front glacis plate was 1in (25mm), at 81 and 69 degrees slant. The side and rear plates 
were also 1in thick plate with the hull floor being 0.63in (15mm) in the front and 0.43in (11mm) in 
the rear. Most of the interior was painted the traditional Italian white, with a lot of the removable 
equipment inside being black. We think the floors were also originally white, but of course that didn't 
last for long.  
 
 

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Picture 7: 
This is a good view of the floor space at the foot of the gunner's position. Both the steering brake and 
the track brake on this side are visible, including the actuating levers. The track brake is the cylinder 
on the right, and the steering brake is the one partially hidden to the left. Inside the track brake is a 
fan that helps keep the drum and brake bands cool, but the small hatch over the brakes contributes 
more cooling air on hot days (the crank is to our right).  
 
The gearbox next to us also radiates heat when in operation, and even with the gearbox oil cooler in 
the rear of the fighting compartment, this was probably not a fun place to be seated during hot desert 
action. The long handle you see to our left is the reduction gear lever again. It appears that these 
floorboards are not easily removable, so I guess there is probably no crew storage under them after 
all.  
 
 

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Picture 8: 
The right sponson next to the gunner normally holds a small box for MG parts and spares, as well as 
the MG, but only their brackets and clamps are visible here. Up above is another ammo storage box 
for MG magazines. The anti-aircraft MG was typically the Breda Model 38, and typically a support 
bracket was mounted on the roof so the weapon only had to be hauled out and mounted on the bracket 
when conditions required. There is more information about the Breda and its ammo in the M13/40 
tank pages in AFV INTERIORS.  
 
A total of 294 Semovente M 42 vehicles were issued to German troops in 1943-44, and by late 1943 
they were in service with six infantry divisions, two Panzer divisions, three Panzergrenadier 
divisions, and one Jager division, of Army Groups C and F, in Italy and the Balkans. References 
indicate that by December of 1944 the total number had dropped to 93. After the war, Italy used its 
remaining Semoventes for a number of years, equipped with Allied radios, but looking pretty much 
the Semovente vehicles during the war.  
 
My thanks again to Mr. Pietro Podavini for sharing his reference information and photos of a 
Semovente da 75/18 with us. If you have additional information you would like to share, we would be 
interested to hear from you.  
 
 

TO SEMOVENTE 75/18, PART 1

 

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(c) 2003, AFV INTERIORS Web Magazine 

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