Maximum load, wherever you are working
Reinforced version of the HD9 tractor, the HHD9 offers in excess of 300 tons of total combined weight and is available in a 3-axle configuration or in the more highly customised 8×8 version for oversize loads.
The HHD9 tractor is ideal for oversize loads in difficult weather and terrain conditions.


The HD9 tractor boasts features that make it a champion of productivity: the high value of the combined total mass enables the use of trailers with high capacities reducing the time of the working cycle.
Its robustness ensures it is reliable. The simplicity of its mechanical and electronic structure limits maintenance time and costs.

Loads up to 10 tons

Loads up to 10 tons thanks to reinforced front drive axles for the most arduous off-road use (routes with steep slopes or heavy loads concentrated on the front of the vehicle).

Reinforced axle (or drive axle)

Loads up to 20 tons

Loads up to 20 tons for each rear axle with width of 2.9 m, and standard reinforced suspension.

Reinforced rear axles

Total combined weight above 300 tons

Total combined weight above 300 tons depending on the configuration of the vehicle.


820 mm wide, unique heavy duty chassis
Two side members in high resistance special steel with a tensile strength of 530 Mpa with large sections to ensure easy equipment mounting, and most importantly, a high level of torsional stiffness (up to 300 kNm) and high stability in the most extreme situations.
320x90x10 mm 3 assi

Carriage shoulder with 140/120 mm pin.

Cast iron carriage shoulder with 140/120 mm pin


To increase the robustness and rigidity of the entire structure of the chassis, Astra has patented the power ring: a closed ring structure of the rear suspension, made up of cast iron carriage shoulders and a lower cross member, which improves the redistribution of forces on the tandem.
This permits a load of up to 40 tons on the rear tandem.

Rear reinforced closed quadrilateral tandem


• Reinforced drive axles with 10 ton load

Reinforced axle (or drive axle)

• Rear reinforced axles with 20 +20 ton load.

Reinforced tandem 20+20 tons


Heavy duty fifth wheel for the heaviest loads (up to 50 tons of load on the fifth wheel).



Cursor 13 litre
Euro III from 480 to 540 hp (VGT)

Radiator with large surface of 0.68 m2 thanks to the increase in space provided by the structure


Max. power Up to 540 hp (397 kW) @ 1900 rpm
Max. torque Up to 2350 Nm from 1000 to 1690 rpm*
*specific low fuel consumption category



3 axles
Duplex front drum 25 kNm
Duplex rear drum 30 kNm


Engine brake power
Cv 402 (300 kW)@1900rpm

Hydraulic retarders integrated in the gearbox:
• INTARDER, installed on the gearbox output shaft
• RETARDER, installed on the input shaft


Iveco Turbo Brake (ITB)

Decompression engine brake which acts on the drain valves


ZF Ecosplit manual gearbox

ZF Ecosplit manual gearbox, ideal for less demanding quarry and mining missions.

• Dry single-disc clutch
• 16 FORWARD and 2 REVERSE gears
• Gear shift lever with double H layout (high or low range)
• Splitter pre-selection on lever (slow and fast speeds)
• Splitter insertion with depression of clutch pedal
• Servo-shift (gear insertion via pneumatic system)
• PTO with possible rear installation or
between clutch and gearbox
• Intarder

ZF AsTronic automatic gearbox

ZF AsTronic automatic gearbox, ideal for less demanding quarry and mining missions.

• 16AS 2630 TO
• Single disc dry clutch with electro-pneumatic control (clutch pedal eliminated)
• 16 FORWARD and 2 REVERSE gears
• 2 operating modes:
• Automatic
• Semi-automatic
• Push-button selector
• PTO with possible rear installation or
between clutch and gearbox
• Intarder

ALLISON automatic gearbox

ALLISON HD 4700 series automatic gearbox, ideal for extremely demanding quarry & mining missions, firefighting e situations requiring superior acceleration or frequent Stop&Go.
• Converter with lock-up on all gears except 1st. Optimisation of shifting and consumption on demanding terrains.
• 7 FORWARD and 1 REVERSE gear
• Limitation of maximum gear that can be inserted (engine protection)
• Integrated retarder
• Lever selector
• Power/eco MODE button

ZF Transmatic hydromechanical

ZF Transmatic hydromechanical gearbox, multiplies torque at launch, ideal for heavy haulage missions and extreme towing operations at low speed.
• Lock-up clutch
• WSK TORQUE CONVERTER available on versions 6×4, 6×6, 8×6 and 8×8 (OPTIONAL for Euro III vehicles)
• Integrated retarder
• Single disc dry clutch with pedal control
• 16 FORWARD and 2 REVERSE gears
• Gear shift lever with double H layout (high or low range)
• Splitter pre-selection on lever (slow and fast speeds)
• Splitter insertion with depression of clutch pedal
• Servo-shift (gear insertion via pneumatic system)


• Single disc dry clutch (STD)
• Ceramic single disc clutch
• Pedal control with hydraulic circuit
• Servo clutch on pedal assembly
• Servo clutch on cylinder (hydromechanical only)


• 3/4-axle with all-wheel drive and max. width of 2.9 m

• Front approach angles > 25° with high ground clearance depending on the configuration and tyres

Transverse and longitudinal differential locks to ensure maximum performance even in heavy off-road conditions.

Availability of high-performance transfer boxes for vehicles travelling with rear-wheel drive and which, when the mission requires, can also engage front-wheel drive:
• ZF-STEYR VG 2700 (up to 30 kNm)



Reinforced front parabolic 5x24x90 – 9 tons


Rear parabolic 5X40X100


Provided with standard tyres, 14.00 R20 or 325/95 R24. Availability, on request, of further types of tyre and tread, subject to approval by the Technical Office


The inside of the cab is specifically designed and optimised to guarantee excellent ergonomics and comfort, making driving relaxing whilst ensuring high functionality. The instrument panel surrounds the driver and makes controls easy and safe to use even in the most difficult and challenging working conditions.

Tilt of up to 60° for easy access to maintenance areas

Optimal visibility thanks to the windows positioned on the lower part of the doors.

Availability of sleeper cab with single or double bunk, high roof cab for better space distribution and extendable rotating beacons.


Donaldson two stage filter, ideal for more dusty or sandy environments.

Additional cooling systems for engine and gearbox

Dual-use tractors suitable for towing half-trailers or trailers with fixed ballasts via twist lock, equipped with rear tow hook and fifth wheel. Front and rear cross members reinforced by tow hooks up to 250 tons on the front and up to 500 tons on the rear. (Configuration subject to evaluation by technical department.

Tractors for double towing carried out with 2 identical engines connected by a tow bar with electro-pneumatic connections. Braking, lighting and speed  synchronisation functions are simultaneous on two vehicles and on the towed trailer. (Configuration is subject to evaluation by technical department).