7121
Diesel-hydraulic motor unit
Hrvatski jezik - Croatian language
The DMU class 712/714, nicknamed »Macosa«, is two-part motor unit,
consisting of a motor wagon (HŽ class 7121) and a trailer (HŽ class 4121). Two
diesel-motors manufactured by MAN are situated under the floor of the motor
wagon, each for every bogy. The DMU-s were produced by Đuro Đaković Works of
Croatia under the licence of Macosa Co., Barcelona, Spain. They were designed
for commuter transport.
Technical data of the DMU:
|
Train arrangement |
Bo'Bo' + 2'2' |
|
Year of construction |
1981 |
|
Manufacturer |
Đuro Đaković Works, Slavonski Brod, Croatia |
|
Received into traffic |
1981 |
|
Power of the train |
412 kW / 560 hp |
|
Max. speed |
120 km/h |
|
Wheel diameter |
920 mm |
|
Weight of the train |
48.0 t / 36.0 t |
|
Axle pressure |
11.7 t / 9.25 t |
|
Overall length including buffers |
44,200 mm |
|
Width of the unit |
2,850 mm |
|
Height of the unit |
3,620 mm |
|
Cabs |
2 |
|
Multiple operation |
max. 3 units |
Traction and auxiliary devices:
|
Diesel motors |
2
x MAN D 3256 BTXUE (206 kW / 280 hp) |
|
Hydraulic transmission |
Voith
T 211r |
|
Axle drive |
Voith
E 13/15, V 13/15 |
|
Compressor |
Knorr
VV 160/200-1 |
|
Disc brakes diameter |
640
mm |
By end of 1983, plans were stated for modification of the DMU class 712
»Macosa«. The first unit to enter Zagreb Railway Works was the 712-108, which
stayed for repair from 1984/08/01 till 1985/07/30. The MAN diesel motors were
repaired, together with hydraulic transmission, Behr-system, axle drive and the
compressor. In 1985 began the installation of domestic-produced alternator (a
substitution for dynamo) of the type »Iskra« AAT 1109, 28V, 95A. Further
overhauls, which were initiated in 1991 at Croatian Railways, constituted a new
subclass 7121-100.
The modified DMU series HZ 7121 1
Because the originally installed diesel-motors of the type MAN D 3256
BTXUE were no longer in production, Traction Dept. of Zagreb purchased in 1988
ten diesel-motors of a more recent type MAN D 2866 LUE/210. The first
diesel-motors were installed on 1991/05/23 onto DMU 712-124 owned by Varaždin
Traction Dept, which had been at Zagreb Railway Works since 1987/05/26. The unit
was previously hauled to Italy to remake the interior.
Technical data of the DMU:
|
Train arrangement |
Bo'Bo' + Bo'Bo' |
|
Years of reconstruction |
1991—1998 |
|
Re-constructor |
Zagreb Railway Works |
|
Received into traffic |
? |
|
Power of the train |
460 kW / 625 hp |
|
Max. speed |
120 km/h |
|
Wheel diameter |
880 / 800 mm |
|
Weight of a trailer |
35.6 t / 47.3 t |
|
Axle pressure |
9 t / 11.8 t |
|
Overall length including buffers |
44,200 mm |
|
Width of the unit |
2,850 mm |
|
Height of the unit |
3,620 mm |
|
Cabs |
2 |
|
Multiple operation |
max. 3 units |
Traction and auxiliary devices:
|
Diesel motors |
2
x MAN D 2866 LUE 603E (230 kW / 312 hp) |
|
Hydraulic transmission |
Voith
T 211r (reinforced) |
|
Primary drive |
Küsel
3K045 164 1020 |
|
Axle drive |
Voith
V13 E13 |
|
Compressor |
Knorr
VV 160/200-1 |
|
Air dryer |
Knorr
LTZ 015H |
|
Secondary drive |
Voith
Transmit S180.5 |
|
Cooling system |
Voith
Kühlanlage |
|
Hydrostatic drive |
Volvo |
|
Air heating |
A.
Friedmann |
|
INDUSI equipment |
RAS
8385 RIZ |
|
Radio dispatcher device |
ZFM
80 KAPSCH |
|
Lubrication of wheel rim |
Vogel
230.189.22 |
|
Cab air-conditioning |
Coleman
6713 |
|
Voltage converters |
Elektrokem
FDIN 50-2.0/24D |
|
Battery-charging devices |
Elektrokem
FDPNB 28-150 A/3U |
|
Disc brakes diameter |
640
mm |
The overhauled DMU is now composed of two identical motor wagons. The
engine car has adopted diesel motor MAN D 2866 LUE 603 with nominal power of 230
kW at 2100 rpm. The hydraulic transmitter Voith T 211r has been reconstructed
for input power of 204 kW at 2100 rpm, with the equipment for drive blockade.
Axle drive has been thoroughly repaired, and new conical pair of cog-wheels has
been installed. There are built in new monoblock wheels. A new cooling system
for the diesel motor has been placed to the side of passengers' space. The drive
of auxiliary equipment is hydrostatic with constant rotation number, now
independent of diesel engine rotation number. Heating of the passengers' space
is manufactured by Friedmann. Heating of the driver's cab is performed using
warm water of diesel engine. Some modifications have been made on cab front
part, and pneumatic equipment has been installed for washing and cleaning of
windshield, as well as Knorr cooling equipment. The auto-stop device
manufactured by RIZ (Zagreb Radio Industry) has been built in, and the
radio-dispatcher device of the type KAPSH.
By end of 1998 two DMU-s have been overhauled, namely the present units
7121-101/102 and 103/104, now operated in Osijek. After the testing of
prototypes, it has been planned to perform the same modernisation on all the
remaining thirty units. Contemporary technical solutions and equipment guarantee
more reliable and more comfortable units fit for regional and commuter
transport.
