Unfortunately, the manufacturers of this BMP specifically give out only a small part of the information about the WZ502G, it is not even known whether the marking is industrial or military. According to the designers, the machine is a deeply modernized model of the BMP WZ502 (military designation ZBD-04, the earlier series of which was designated as ZBD-97). One of the key points of the ZBD-04 deep rework is that the authors cite the presence of excess capacity to overcome water obstacles, such as the installation of a powerful jet propulsion unit and the ability to withstand 2-3х sea waves.
However, these opportunities are completely unnecessary for the units of the People’s Liberation Army of China, stationed in the interior of the country. The refusal of increased buoyancy allowed us to change the armored hull in order to enhance the overall security of the vehicle. Nevertheless, the ability to swim across the water barrier without preparatory work for the BMP still remained, but the movement through the water due to the rewinding of the tracks eliminated all the seaworthy qualities of the predecessor.
The body of the WZ502G is one-piece, welded from steel armor plates that provide reliable protection for the crew and the landing against bullets and striking elements of artillery shots. If you compare the body of the WZ502G with the ZBD-04, then its height decreased slightly, the roof was made flat, and the armor plates of the sides became vertical, although on the previous model they had a slight tilt angle. To reduce the area of vulnerable booking areas, the shape and location of the hatches for engine and transmission servicing has changed, and the geometry of the control compartment hatch, which is now integrated with a set of monitoring instruments, has also been changed.
Now it is possible to optionally install additional armor elements on the lower frontal part of the hull, moreover, the thickness of the armor has already been increased.
Arrangements to strengthen the armor were not in vain, and, as the manufacturer claims, the security of the machine reached a new qualitative level. Namely: the frontal armor of the hull and the tower withstand a direct hit of 30 millimeter-armor-piercing projectile at a distance from 1000 meters, side armor does not penetrate 14.5 millimeter-sized ammunition from a distance of 200 meters and more, the stern and roof do not break through with armor-piercing bullets of a caliber 7.62 millimeter and more, the stern part and the roof are not penetrated by armor-piercing bullets of a caliber 5 mm and more These parameters correspond to the 4-th, 3-th and 4569-th levels of ballistic protection, respectively, according to the classification of the STANAG XNUMX adopted in the North Atlantic Alliance (NATO).
The results of modernization significantly affected the total mass of infantry fighting vehicles. The machine was heavy on 5 tons and began to weigh 25 tons, while its predecessor weighed just 20. The increase in mass had a negative impact on the power density of the vehicle as a whole, but at the same time it remained at the level of the Norwegian BMP Strideford 90. The power plant is almost an exact copy of the Soviet UTD-29 - V-shaped (camber angle 144 degrees) four-stroke 10-cylinder diesel. The engine is naturally aspirated. Its maximum power is of the order of 500 horsepower (about 368 kilowatts), torque 1461 newton meters (149 kilogram-forces per meter). The specific fuel consumption of the order of 250 grams per kilowatt-hour. The capacity of the fuel system is 700 liters.
The air for the power plant is pre-cleaned in a cyclone tapeless single-stage air cleaner, which automatically cleans itself from solid dust particles. Engine cooling system liquid, closed with forced circulation of coolant.
Blowing radiators with air is forced due to the effect of ejection. The preheater, to facilitate engine start-up during the cold season, is a fire-tube boiler with a nozzle burner, which warms up the coolant, engine oil and intake air.
The power plant is mounted in the same block with the transmission. The transmission is hydromechanical, reversible, has a four-speed planetary gearbox with a differential turning mechanism and hydraulic propulsion drive.
The gearbox has 4 transmissions forward and 2 reverse. Hydraulic volumetric transmission drive is an adjustable axial piston hydraulic motor. Onboard planetary gearboxes have one gear. Disc brakes are dry. Brake actuator is equipped with power. The controls of the main power train of the vehicle are a steering column with a motorcycle steering wheel and a gear shift lever.
The caterpillar drive is located in the stern of the machine, and the guide wheels in front. Caterpillars have small links of the civic engagement with parallel rubber-metal hinges and a rubberized treadmill. The track tensioning system is electromechanical, controlled from the driver's seat, has a tension force indicator.
The BMP drive wheels are made of steel and have a removable gear rims for ease of repair. The directing wheels also steel duo-pitch. 6 gable support and 3 single-sided supporting rubber-coated rollers are installed on each side. The suspension of the rollers is independent with torsional shock absorption. In order to stabilize, torsion boards are mounted non-axially. The first, second and sixth suspension units are equipped with double-acting telescopic hydraulic shock absorbers. In addition, the first, second, fourth and sixth nodes of the suspension have travel stops of the rollers with rubber stops.
The standard armament of the machine is represented by the 100 millimeter cannon paired with the 30 millimeter cannon, which is completely identical to the armament of the Soviet BMP-3. But, the fire control system (LMS) has some differences. The BMP WZ502G is equipped with two thermal imagers, one of which is at the disposal of the commander of the vehicle, and the second is part of the aiming system for pointing the gun. At the disposal of the commander of the crew also included a new stabilized observation device. The aiming complex provides automatic target tracking and control of guided missiles, which are induced by the laser beam. Also implemented the possibility of using the main armament from the crew commander.
In addition, the machine has a smoke screen installation device similar to the Russian “Tuche”.