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HOWO - A7 6x4 Tractor Truck (Driving Type)

Model ZZ4257V3247N


Diesel 4 stroke diesel engine  
Engine Model D12.42, Euro II emission standard  6 cylinder in-line with water cooling, turbo-charging & intercooling   
Maximum Output 420hp (309Kw) at 2000 rpm 
Maximum Torque 1820Nm at 1100~1400 rpm 
Displacement 11.596L
Bore 126mm
Stroke 155mm 
Compression Ratio 17:1
Specific fuel consumption 196g/kWh
Engine oil filling quantity 38L
  Thermostat with 80° C opening begin
  Twin cylinder air compressor 
  Visco Fan
Option Thermostat with 71°C opening begin


Single-plate dry diaphragm spring clutch diameter 430(A)mm, hydraulically operating with air assistance


Transmission, model HW19710, 10 forward and 2 reverse
Ratio 14.28 10.62 7.87 5.88 4.38 3.72 2.43 1.80 1.34 1.00 13.91/3.18 (R)

Propeller Shaft

Double universal Joint propeller shaft with gear-shaped coupling flange.

Front Axle

New HW09 series, Steering with double T-cross section beam

Rear Axle

HC16 casted axle housing and double reduction drive axle ( central single reduction  and hub reduction); differential locks between axles and wheels, with drum brake system
Ratio 5.73
Option 4.80 and Automatic slack adjuster


Frame High-strength U-profile frame with a section of 300x90x8 and reinforced subframe, all cold riveted cross members
Front suspension 9 semi-elliptic leaf springs with hydraulic telescopic double-action shock absorber and stabilizer
Rear suspension 12 semi-elliptic leaf springs with bogie spring and stabilizer
Aluminum fuel tank 400 L capacity with locking fuel cap, fitted to the off side of the chassis  
Option Aluminum fuel tank:600L
Fifth wheel size 3.5 inch
Option split type or integrated side guard; integraded mudguard


ZF power steering, hydraulic steering with power assistance
Ratio 22.2-26.2


Front disc rear drum brake, four-circuit protection valve include ABS+ASR+EBL+TPM
Service brake dual circuit compressed air brake
Parking Brake (emergency brake) spring energy, compressed air operating on reaar wheels
Auxillary brake Engine exhaust brake

Wheels and Tyres

Tyres 315/80R22.5
Rims 8.5-20, 10 hole-steel 
Option 12.00R20, 11.00R20

Driver's cab

Brand new A7 High-floor high cab, adjustable steering wheel with various heights and angles, central door lock, electri window lifter, power rear view mirror, .2-am windscreen wiper system with 3 speed, VDO electrical control system, air suspension adjustable driver's seat, rigid adjustable co-driver's seat, heating & ventilation system, exterior sun visor, s tereo radio, driving recorder, safety belts, air horn, air conditioner, and double berths with 4-point support fully floating suspension with transverse stabilizer, CD machine, cruising combined switch.


24V, CAN bus inttellectual electronic control system
Operating voltage 24V, negative grounded
Alternator 3-phrase, 28V
Batteries 2x12, 165Ah
Option 180Ah
  Cigar-lighter, horn, headlamp, fog light, brake lights, indicators and reverse lamp

Dimensions in mm

Wheel base 3225+1350
Front wheel track 2022
Rear wheel track 1830
Front overhang 1540
Rear overhang 870
Approach angle(°) 15
Departure angle(°) 46
Overall Dimension 6985x2496x3850(mm) (3745 without air spoiler

Weight in kg

Dead weight 9200
Permissible loading capacity at fifth wheel 15670
Gross vehicle  weight 25000
Gross combination weight 100000
Front axle loading capacity 7000
Rear axle loading capacity 18000


Maximum driving speed (km/h) 91
Maximum gradeability (%) 36
Minimum ground clearance (mm) 294
Minimum turning circle (m) 16
Fuel consumption (L/100km) 43

The manufacture reserves the right of technical alteration/change for better improvement withou prior notice.