Progress ZT 320

IFA
ZT 323 plowing
ZT 320
Manufacturer:	Tractor factory Schönebeck
Sales designation:	Progress ZT 320
Production period:	1983-1990
Engines:	4 VD 14.5 / 12-1 SRW
Traction:	20 kN
Length:	4650 mm
Width:	2120 mm
Height:	2865 mm
Wheelbase:	2800 mm
Gauge:	front: 1525–1650 mm rear: 1650–2000 mm
Turning radius:	with steering brake: 5035 mm without steering brake: 5690 mm
Standard tires:	front: 10-20 MPT, 8 PR rear: 18.4- 34 AS, 14 PR
Top speed:	30.69 km / h
Empty weight:	4980 kg
Previous model:	ZT 300
Successor:	none

The traction tractors of the series Progress ZT 320 and 323 are universal tractors of the 20 kN traction class, which were manufactured in the GDR from 1984 as the successor to the ZT 300 series . The manufacturer was the VEB Tractorswerk Schönebeck (Elbe) , which belonged to the Combine Progress Agricultural Machinery .

history

ZT 320-A with mounting plate for a snow plow

Planning began at the end of the 1970s, the pilot series started on December 19, 1983. The vehicles were not completely redeveloped, rather it was an extensive facelift. The ZT 320 model was actually obsolete when production started. The main reason for this was the lack of all-wheel drive. That is why it was only built in small numbers; VEB concentrated on the production of the all-wheel drive, but otherwise structurally identical ZT 323.

technology

Tractor progress ZT 323-A with tank trailer

The ZT 320 is a half-frame construction tractor . It is essentially based on its predecessor, the ZT 300. The engine is the 4 VD 14.5 / 12-1 SRW inline four-cylinder diesel engine in a revised form with still 74 kW, but with a reduced specific fuel consumption. Only the rear wheels are driven on the ZT 320. The ZT 323, on the other hand, also has an automatically engaged front-wheel drive. The power is transmitted from the engine via a DK 80 double clutch to a helical powershift transmission with three groups of four gears. The first and second groups are reversible . With the pneumatically operated second stage of the double clutch, an underload shift stage can be switched on via a roller freewheel and the motorized PTO shaft. The engine- linked PTO shaft rotates at 540 min ⁻¹ at 1800 min ⁻¹ engine speed; the clutch-dependent power take-off shaft rotates at 1000 min ^-1 . The steering of the tractor is fully hydraulic, which means that a force of 30 to 50 N has to be used to steer, the steering column is adjustable. The hydraulically operated sliding shoe brake only acts on the rear wheels on the ZT 320, on all wheels on the ZT 323 and can also act as a steering brake in both cases. The handbrake acts as a band brake on both rear wheels, the trailer brake is operated with compressed air. The tractor is equipped with a three-point power lift for attachments . The working device on the three-point power lift is optimally pressed onto the rear axle by means of control hydraulics, which minimizes wheel slip. The driver's cab is vibration-dampened, noise-insulated and overturn-proof. The driver's seat is air-suspended. Heating and air conditioning were also available as optional equipment. After the introduction of central lubrication of the engine, the series was designated as ZT 320-A and ZT 323-A from 1985. This marking was retained until production was discontinued in 1990.

Technical specifications

	ZT 320	ZT 323
engine
Engine designation	4 VD 14.5 / 12-1 SRW
Engine type	In-line four-cylinder four-stroke diesel engine with M-process and water cooling
Bore × stroke, displacement	120 x 145 mm, 6560 cm³
power	74 kW at 1800 min -1
maximum torque	422 Nm at 1350 min -1
Specific fuel consumption	237 g / kWh
Power transmission
Drive on	Rear wheels	all wheels
Standard tires	front: 10-20 MPT, 8 PR rear: 18.4-34 AS, 14 PR	front: 16-20 MPT rear: 18.4-34 AS
Twin tires	13.6-38 AS
coupling	Double clutch DK 80
transmission	unsynchronized transmission with three stages and four gears as well as underload stage
PTO shafts	Engine and ground speed PTO, 540 min -1 to 1000 min -1
Power lift	Three-point linkage with 16 MPa working pressure 39.24 kN force on the lower link
Dimensions and weights
length	4650 mm
width	2120 mm	2240 mm
height	2865 mm
wheelbase	2800 mm
Gauge	front: 1525–1650 mm rear: 1650–2000 mm
Turning radius	with steering brake: 5035 mm without steering brake: 5690 mm
Ground clearance	475 mm
Empty weight	4980 kg	5670 kg
Maximum permissible trailer load	30 t
Electrical system
alternator	Three-phase alternator, 28 V, 30 A.
Power storage	2 × lead acid accumulator, 12 V
Board voltage	12 or 24 V.

Speeds in km / h at engine speed of 1800 min −1
group	gear	forward	backward
I.	1	1.83	1.89
I.	2	3.21	3.32
I.	3	5.01	5.18
I.	4th	7.94	8.21
II	1	2.27	2.35
II	2	3.99	4.13
II	3	6.23	6.45
II	4th	9.88	10.22
III	1	7.07
III	2	12.14
III	3	19.36
III	4th	30.69

literature

• M. Kunze: Towing tractors FORTSCHRITT ZT320 + ZT323 DEWAG Leipzig, 1983. Edition 53-85-83 2000 IV-2-23 464
• Achim Bischof: Tractors in the GDR. Podszun, Brilon 2004, ISBN 3-86133-348-1 .

Web links

Commons : Progress ZT320  - Collection of pictures, videos and audio files

Commons : Progress ZT323  - Collection of pictures, videos and audio files

Wikibooks: Tractor Lexicon: Progress Universal Tractor ZT 323  - Learning and teaching materials

• GDR agricultural machinery: tractors