Pz Kpfw III Ausf B. The turret view shows the redesigned cupola.
In 1936 the first model of the Pz Kw III
was produced by Daimler-Benz and ten vehicles designated "1/ZW"
underwent troop trials. Eight of these were fitted with the 3.7 cm gun and
chassis numbers started at 60,001. Although the hull, superstructure and turret
already took the form familiar in the later Pz Kw III models, the suspension
consisted of five large double bogies, which were suspended on coil springs,
plus a front driving sprocket and a rear idler together with two return
rollers. Armour was between 5 and 14'5 mm thick and the overall weight was 15
tons. The power unit was a development of the Maybach DSO 12-cylinder
high-performance 108 TR petrol engine of about 11 litres which produced a
maximum of 250 hp. Maximum sustained output was however only 230 hp and top
speed was 32 kph. Transmission was by a ZF SFG 75 five-speed gearbox. One
hundred and fifty rounds were carried for the main armament and 4500 rounds for
the three machine guns, two of which were coaxial with the main armament in the
turret. This vehicle was known unofficially as the Pz Kw III (3.7 cm) Ausf A.
The marks B and C appeared in 1937. A new
suspension was tried, consisting of eight small bogie wheels suspended on
longitudinal leaf springs and the number of return rollers was increased to
three. Armament remained a 3.7 cm tank gun L/45 in an internal mantlet and two
MG 34s, while a third machine gun, mounted beside the driver, was worked by the
wireless operator. Fifteen of each of the B (type 2/ZW) and the C (type 3a/ZW)
models were constructed. Armour was retained at 14.5 mm all round. The Model D
(type 3b/ZW) which finally went into quantity production, appeared at the end
of 1938. With the introduction of Model D all previous trial models were
redesignated Model D. The various original suspensions were retained, but these
vehicles were uparmoured to 30 mm all round, increasing the total weight to
about 19 tons. The ZF Aphon SSG 76 transmission was used.
From the Model E onwards the more powerful
Maybach 12-cylinder HL 120 TR was fitted, which increased the maximum output to
320 hp by enlarging the bore from 100 to 105 mm and increasing the cylinder
capacity to 11.9litres (torque 80 m/kg). The gearbox in this vehicle was the
Maybach Variorex pre-selector with 10 forward and one reverse speed. This
complicated transmission was intended to make gear changing easier as the
change was carried out by a vacuum after the gear had been selected and the release
valve activated by depressing the clutch pedal. The 9th and 10th gear positions
were overdrives. The speed of 40 kph at 2800 rpm was not to be exceeded.
Fifty-five vehicles of this version were produced.
On 27th September 1939 the Army Regulations
circular announced "Panzerkampfwagen III (3.7 cm) (Sd Kfz 141), has been
adopted as a result of its successful troop trials".
In the mass production which now followed
the participating manufacturers were: AItmärkische Kettenfabrik GmbH
(Alkett)-Spandau (assembly) and Falkensee (chassis construction); Daimler-Benz
,AG-Berlin-Marienfelde; Fahrzeug- und Motorenbau GmbH (Famo)-Breslau; Henschel
& Sohn AG -Werk III, Mittelfeld-Kassel; Maschinenfabrik Augsburg-Nürnberg
AG (MAN)-Nuremberg; Mülenbau und Industrie AG (MIAG)-Amme Werk, Brunswick;
Waggonfabrik Wegmann AGKassel; and Maschinenfabrik Niedersachsen-Hannover-
Hannover-Linden.
The Pz Kw III Ausf E (type 4/Zw) (reference
order 652/17 of 23rd April 1940), which appeared in 1939, featured the
finalised chassis design of this series. There were now six bogies on each side
(bogie size 520 x 95-398, track roller size, 310 x 70-302), mounted on
transversely-fitted torsion bars. The vehicle weighed 19.5 tons when fitted
with allround armour 30 mm thick and was still equipped with the Maybach HL 120
TR engine. The chassis weighed 13.8 tons. Two coupled machine guns (MG 34s) in
the turret had, until now, been coaxial with the main armament, but from this
version onward a single coaxial machine gun was fitted. Some Pz Kw III Ausf E
versions had the old model D type turrets with an internal mantlet and two
turret machine guns however. Transmission was via a main clutch to the Maybach
Variorex pre-selector gearbox already described. This gearbox was of the
constant-mesh type where sliding gear switch sleeves transferred the drive to
the two cog wheels required for the correct gear. The main clutch was
hydraulically operated and the bevel gear and the steering gear were flanged to
the variable gears. Clutch steering was affected by means of mechanical
servo-internal, expanding brakes with hydraulic assistance. Steering and
standard brakes were located in the same housing and from these the drive went
to the driving sprocket. The rear idler wheel, in this version, consisted of a
boss upon which two wheel discs were welded. The 37 mm gun now had an external
mantlet. By 1940 100 of these vehicles had been built, intended as the main
equipment of tank regiments. The German tank industry could only produce in
limited numbers, and this low production capacity became more and more
apparent. The Pz Kw III received its baptism office in Poland and there proved
itself. For the attack on France on loth May 1940 a total of 349 Pz Kw IIIs was
available.
On 4th January 1939 the Weapons Department
received a contract to develop further the Pz Kw III and to arm it with a 5 cm
tank gun. Once again Daimler-Benz was made responsible for the chassis and
superstructure, and Krupp for the design of the turret. It was proposed to
install the 5 cm tank gun L/42 which had a muzzle velocity of 450 to 685 metres
per second. The first vehicles equipped with the 5 cm armament were not ready
by the 10th May 1940 for the offensive in France and Flanders but were issued
during the course of this campaign. The designation of this version was
"Pz Kw III (5 cm) Ausf F (type 5/ZW)".
In this model the Maybach HL 120 TRM was
installed, which had an output of 300 hp at 3000 rpm and a sustained output of
265 hp at 2600 rpm. This power unit was constructed under licence by
Norddeutsche Motorenbau (Nordbau). The weight of the vehicle was not
appreciably altered, but the somewhat lower cupola was a distinctive feature.
An equipment box was now fitted at the rear of the turret. From this version on
the drive and idler wheel patterns were altered, the new idler being spoked.
Four hundred and fifty machines of this type were produced.
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