Strength and reliability in any condition
The HD9 tractor stands out for the strength and reliability it guarantees in off-road conditions.
It is used particularly for oversize loads (trailers, half-trailers or dual-use) in the oil and extraction sectors, thanks its ability to adapt to difficult and adverse weather and terrain conditions, from the heat of the African deserts to the ice of Alaska.
Available in a 2 or 3-axle and tridem version, it offers a combined total weight above 200 tons.


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

Reinforced axle (or drive axle)

Loads up to 20 tons for each rear axle with width of 2.5 m, standard reinforced suspension.

Reinforced rear axles

Total combined weight above 200 tons depending on the configuration of the vehicle.

Closed quadrilateral tandem


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 secure easy equipment mounting and most importantly a high level of torsional stiffness (up to 202 kNm) and high stability in the most extreme situations.


  • 320x70x8 mm 2 axles
  • 320x90x10 mm 3 and 4 axles
"C-section" with flat, parallel elements to ensure easy configuration


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 enables a load of up to 40 tons on the tandem.


Front and drive axles:

  • Axle with load up to 9 tons
  • Drive axle with load up to 9 tons
  • Reinforced drive axle with load up to 10 tons
Reinforced axle (or drive axle)

Rear axles:

  • 13 ton load (2 axles)
  • Tandem with 16+16 ton load (3 and 4 axles)
Tandem 16+16 ton


Thanks to the robustness of the chassis, the fifth wheel is applied without a subframe, with the advantage of a lighter weight and lower complexity.



adjusts to oscillations and uneven terrain

Fixed. Rocker to guarantee


Cursor 13 litre

Euro III, from 380 a 420 cv (WG) and from 440 to 540 cv (VGT)
Euro V, from 410 cv (WG) and from 440 to 560 cv (VGT)
Euro VI, from 450, 510 and 570 cv (eVGT)


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

Max. power up to 570 hp (419 kW) @ 1900 rpm
Max. torque up to 2500 Nm from 1000 to 1.600 rpm*

* specific low fuel consumption category


Emissions and consumption

SCR (Selective Catalytic Reduction) technology which minimises fuel emissions and consumption based on the best technological standards.



Duplex front drum 25 kNm
Duplex rear drum:

  • FPT: 24 kNm
  • KESSLER: 30 kNm

Anteriori duplex a tamburo 25 kNm
Posteriori duplex a tamburo:

  • FPT: 24 kNm
  • KESSLER: 30 kNm

Engine brake power

630 hp (463 kW) @ 1900 rpm
Hydraulic retarders integrated in the gearbox are ideal during periods of continuous and constant slowing down and during heavy load conditions to protect the service brakes from wear.

  • INTARDER, installed on the gearbox output shaft
  • RETARDER, installed on the input shaft

Availability of Iveco Super Engine Brake (SEB)on Euro VI engines, an electronically controlled engine brake throttle which regulates the exhaust manifold and guarantees 50% more braking power compared to previous versions.


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 HD 4700 series 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 gearbox

ZF Transmatic hydromechanical gearbox, multiplies torque at pick-up, ideal for heavy haulage missions and dangerous 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)


• 2/3-axle with or without all-wheel drive as standard (max. width of 2.5 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 dangerous 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:

  • IVECO TC 2200 (up to 22 kNm)
  • ZF-STEYR VG 2000 (up to 27 kNm)
  • ZF-STEYR VG 2700 (up to 30 kNm)



Front parabolic springs with hydraulic shock absorbers:

  • 2 – 3 axles with 4 leaves 24×90 mm
  • 4 axles with 3 leaves 26×90 mm

Reinforced suspension system, mandatory for payload higher than 8 ton, with 5 leaves 24x90mm for 2 – 3 axles and 4 leaves 26x90mm for 4 axles.


Rear parabolic springs, swiveling on central pin integrated by torque bars and stiffening brackets:

  • 2 axles with 4 leaves 24x90mm+ 1 leaf 50x90mm
  • 3 – 4 axles with 4 leaves 40x100mm

Reinforced suspension system, mandatory with a payload on the rear tandem of 40 ton, with 5 leaves 40x100mm.

On request, 3 and 4 axle vehicles with special equipment with very high center of gravity and for extreme conditions of use can be equipped with conventional springs with 10 leaves 25x100mm.


Availability of different types of tyres and treads, different sizes adapted to any type of mission, from well-trodden, to rocky, to unstable terrain that requires resilience.


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 practical 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).