HFZ 30 NT - VOLK Fahrzeugbau

innovation@work ®
HFZ 20 NT
HFZ 30 NT
Hybrid Tow Tractors
Towing capacity 20 – 30 t
Fahrzeugbau GmbH

Hybrid Tow Tractors
Your problem
Whenever operating conditions require use in closed buildings as well as mastering
comparably large distances outdoors, pure diesel or electric tow tractors prove to be
inadequate: while diesel tow tractors are excellently suited for covering great distances
outdoors, they can be used only very limitedly in closed buildings because of the
emissions. Electric tow tractors on the other hand are suitable for use in closed spaces
but not for use on spacious airport grounds or company compounds due to their limited
battery capacity.
Fahrzeugbau GmbH

Our solution
The VOLK Hybrid Tow Tractors HFZ 20
NT – HFZ 30 NT are equipped with
an electric motor as well as a diesel
engine. Therefore they can be used
both in closed spaces and outdoors.
The diesel drive can be switched on or
off without any jerks and without
interrupting traction – regardless of
the speed and driving direction. This is
possible because the driving axle is
always driven by the electric motor.
When the diesel engine is switched on,
a generator driven by this diesel
engine generates the current required
for the electric motor. Excess power
is used to recharge the traction
batteries. After the diesel engine is
shut off, the required current is taken
from the traction batteries.

Lower life cycle costs
The acquisition costs of investment goods typically make out only a fraction of the total
life cycle costs. Therefore, not only the initial purchase price but also the later operating
costs, useful life and resale value play an important role in investment decisions. Balance
sheet policies must also be considered when developing investment projects. Given
this, one of our basic objectives is to minimize the life cycle costs of our vehicles and to
offer our customers not only vehicle purchasing but also tailor-made leasing models.
Fahrzeugbau GmbH

Ergonomically designed seats
Lower operating costs thanks to higher efficiency
The design principle of the VOLK
Hybrid Tow Tractors HFZ 20 NT – HFZ
30 NT guarantees very low fuel consumption
and minimum engine wear.
Because the diesel engine is used for
power generation only, the vehicles
are always driven electrically even
when the diesel engine is switched on.
Therefore the diesel engine always
The VOLK Hybrid Tow Tractors HFZ 20
NT – HFZ 30 NT are optimally protected
against corrosion: not only are the
vehicle frames fully zinc-dipped serially
but they also feature a solid, cavityfree
design. Thus corrosion caused by
moisture penetrating the frame is
almost impossible. As a result, the
We are pleased to make customized
leasing offers for the VOLK Hybrid Tow
Tractors HFZ 20 NT – HFZ 30 NT. This
saves equity capital and credit lines
and preserves liquidity. Because
operates in an optimally efficient r.p.m.
range even during short load peaks,
e.g. when accelerating with load. The
r.p.m. of the diesel engine is adjusted
as required by a speed controller. This
dynamic load in the low to medium
speed range prolongs the service life
of the diesel engine and results in
relatively low fuel consumption.
Clearly arranged controls Video rear-view system
Longer useful life and higher resale value
useful life is noticeably increased and
the resale value is higher. The same
purpose is served by the standard
electrolyte circulation of the traction
batteries: this technology prevents
electrolyte layering in the batteries,
thus prolonging the useful life of the
batteries considerably.
Off balance investment and financial flexibility thanks
to individual leasing offers
capitalization on the balance sheet is
carried out by the lessor, the lessee’s
balance sheet also remains “slim“.
This means a considerable increase in
flexibility.

Higher availability
Because tow tractors on airports and in industrial facilities are frequently used in
continuous multi-shift operation seven days a week, maintenance and repair jobs usually
cannot be postponed to non-productive or idle machine times. Therefore they almost
inevitably result in an outage of the vehicles which is always connected with high costs
and can be bridged only by the provision of replacement vehicles in some cases. Thus one
of our priority development objectives is to increase vehicle availability.
Fahrzeugbau GmbH

Rapid change diesel engine/generator unit (VOLK POWER PACK ® )
Fewer downtimes thanks to the
rapid change diesel engine/generator module
The VOLK Hybrid Tow Tractors HFZ 20
NT – HFZ 30 NT are serially equipped
with a patented rapid change diesel
engine/generator module, the socalled
VOLK POWER PACK ® . Unlike
conventional hybrid tow tractors,
these tow tractors have a diesel engine
that is not permanently installed in
the vehicle but is part of a modular
unit. This unit can be exchanged very
easily in about 5 minutes. Because
the VOLK POWER PACK ® also has an
integrated tank, a starter battery
and a starter, it can be operated
Less maintenance required thanks to
three-phase technology and Aquamatic
The VOLK Hybrid Tow Tractors HFZ
20 NT – HFZ 30 NT are serially
equipped with modern three-phase
asynchronous motors. Unlike
conventional direct current motors,
these motors contain hardly any wear
parts, such as carbon brushes, and
are therefore practically maintenancefree.
To minimize battery maintenance
costs, the VOLK Hybrid Tow Tractors
HFZ 20 NT – HFZ 30 NT are equipped
Shorter downtimes thanks to
practically unlimited range
The VOLK Hybrid Tow Tractors HFZ 20
NT – HFZ 30 NT are equipped with
a very powerful three-phase generator.
With a power output of up to 30 KW
(HFZ 30 NT), this generator continuously
provides more power than
is consumed by the vehicle’s drive
motor and accessories – except for
temporary load peaks. As a result, the
autonomously. Therefore all
conventional maintenance jobs on the
diesel engine can be performed
independently from the vehicle. For
this reason the VOLK Hybrid Tow
Tractors HFZ 20 NT – HFZ 30 NT can be
operated even during this work. For
example, one of our customers has a
fleet of 70 VOLK Hybrid Tow Tractors
for which they have two additional
VOLK POWER PACK ® modules. This
way a spare unit is always available
to prevent downtimes due to
maintenance.
with an Aquamatic system. This is a
central water refilling system which
enables quick and easy refilling of all
battery cells to the correct fill level. To
ensure that water refilling is not
forgotten in the hectic pace of daily
business, the vehicles are equipped
with an electronic electrolyte level
indicator which dependably warns the
driver and the service personnel when
the electrolyte level gets critical.
generously dimensioned 80 V/375 Ah
traction batteries can be easily
recharged during diesel operation.
External battery charging is usually not
necessary. To minimize downtimes
due to fueling, the VOLK Hybrid Tow
Tractors HFZ 20 NT – HFZ 30 NT are
also equipped with a large 100 liter
diesel tank.

Higher future proofness
Today, the general economic conditions are characterized more than ever by high
dynamics and frequent, often discontinuous changes. Apart from pure profitability
considerations, the aspect of future proofness is increasingly gaining importance
particularly for long-term investments. For this reason, one of our central development
objectives is to increase the future proofness of your investments through the modular
design of our products.
Fahrzeugbau GmbH

Strategic flexibility and future-orientedness thanks
to modular design
The modular design of the VOLK Hybrid
Tow Tractors HFZ 20 NT – HFZ 30 NT
makes them future-oriented and highly
flexible tractive vehicles: for example it is
very easy to upgrade vehicles initially
purchased as pure electric tow tractors
easily into hybrid tow tractors when
operating conditions have changed.
Conversely, of course, VOLK Hybrid Tow
Tractors can be effortlessly “downgraded“
to simple electric tow tractors.
Thus our products provide you with a
high degree of strategic flexibility enabling
you to react optimally to changed
operating conditions.

1.295
Technical Drawings HFZ 20 NT – HFZ 30 NT
985
Side view
Turning radius
3.520
3.050
2.920
55°
Dieselmotor
3.254
Tank
5 ltr.
150
1.700 540
r = 880
560
1.400
Fahrzeugbau GmbH
1.980
650
Front view
420
650
1.205
1.400
810
1.320

Technical Data HFZ 20 NT – HFZ 30 NT
Performance HFZ 20 NT HFZ 30 NT
Towing capacity rated load in industrial applications (BGV D 27) 20.000 kg 30.000 kg
rated load on airports (BGV C 10) 11.500 kg
Load capacity rated load 500 kg
Rated drawbar pull 5.800 N 8.000 N
Max. drawbar pull 13.800 N 20.000 N
Travel speed with 20.000 kg resp. 30.000 kg towed load 10 km/h 11 km/h
Drive/Electric System
with 11.500 kg towed load 14 km/h 17 km/h
without load 28 km/h 28 km/h
Diesel engine type Deutz D2009L4 Deutz F4L2011
power rating 36 KW 42 KW
displacement 3.000 ccm 3.110 ccm
Generator power rating 23 KW (AC) 30 KW (AC)
Electric motor power rating 16 KW (AC) 20 KW (AC)
Gears transmission ratio i = 20.3
Battery voltage/capacity 80 V/375 Ah
Dimensions/Weights
Length 3.254 mm
Width 1.400 mm
Height 1.980 mm
Seat height 985 mm
Loading area length 1.850 mm
width 2 x 350 mm
Loading height without load 955 mm
Ground clearance center of wheelbase 150 mm
Turning radius outside 3.520 mm
Vehicle weight with battery and VOLK POWER PACK ® 4.400 kg
Battery weight 1.000 kg
VOLK POWER PACK ® weight 950 kg
Chassis
Tires front dimensions 205/70 R 15
rear dimensions 205/70 R 15
Wheel base 1.700 mm
Track width front 1.205 mm
rear 1.205 mm
Steering hydraulic power steering
Service brake type
hydraulic double-circuit brake system, front axle:
disk brakes, rear axle: multiple disk brakes
number of braked wheels 4
Parking brake automatic parking brake
Suspension front independent suspension with coil springs
rear leaf springs

innovation@work ®
Fahrzeugbau GmbH
VOLK Fahrzeugbau GmbH
Stahlstraße 15
88339 Bad Waldsee/Germany
Tel: +49 7524/9709-0
Fax: +49 7524/9709-40
eMail: info@volk.de
Website: www.volk.de
No responsibility is taken for the correctness of this information. Errors excepted. Subject to change without notice. Some of the displayed vehicles are fitted with optional extras.