MAZ-503

The MAZ-503 at a glance

When MAZ replaced its bonneted MAZ-200 family, it designed the new generation as a set of models on one cab-over platform: a flatbed, a tractor unit, a chassis for special bodies and a dump truck. The MAZ-503 was that dump truck. It shared the cab, engine and most mechanical parts with the flatbed MAZ-500, but had a shorter wheelbase, a reinforced frame and a hydraulic tipping body.

Development of the MAZ-500 family and its tipper

MAZ built the first prototypes of the new cab-over range from 1958. Small-batch series production began in 1963, and by 1965 the plant had switched completely from the MAZ-200 to the new family. The cab-over layout put the engine under a tilting cab, which made the trucks shorter for the same load space and gave the driver a better view of the road.

According to the old 1cars text, the first experimental dump truck under the MAZ-503 name appeared in 1958 and was tested for work in quarries, with a second prototype with a new bumper and uprated mechanicals following in 1962. The production MAZ-503 was introduced in 1963.

In 1970 the whole family was revised and received the suffix "A". For the flatbed, payload rose by 500 kg to 8 tonnes and the wheelbase grew by 100 mm. The tipper became the MAZ-503A, with a changed front end and more modern electrical equipment, and stayed in production until 1977. That year MAZ introduced the MAZ-5335 range, and the dump truck role passed to the MAZ-5549.

YaMZ-236 diesel and drivetrain

The MAZ-503 used the standard engine of the MAZ-500 family, the YaMZ-236. It is a four-stroke V6 diesel with direct injection and a 90-degree bank angle, a long way from the two-stroke engine of the earlier MAZ-200. Heavier MAZ-500 models, such as some tractor units, used the larger V8 YaMZ-238.

The firing order, compression ratio, gear ratios and consumption figure come from the old 1cars text. The fifth gear is an overdrive with a ratio of 0.66. Power steering was standard, which was important for a heavy tipper often driven on soft ground at low speed.

Tipping body, frame and suspension

The frame was built from pressed channel sections joined with rivets. It sat on four longitudinal leaf springs, with telescopic hydraulic dampers added at the front. The steel body tipped to the rear, driven by a hydraulic ram with a pump powered by the engine. All tipping operations were controlled from the cab, and a special valve could shake the raised body to help sticky loads slide out.

Body volume was 3.8 m³ as standard, rising to 5.1 m³ with raised sides for lighter loads such as coal. The truck's own brake system covered only the truck itself, so the basic MAZ-503 was not designed to pull a braked trailer.

Dimensions and weights

The dimensions are those listed for the MAZ-503A in the old 1cars text. Compared with the flatbed MAZ-500A, the tipper's wheelbase is roughly 450 mm shorter, which makes it more manoeuvrable on building sites and in quarries.

Cab and equipment

The cab was the all-metal welded unit of the MAZ-500 family, with three seats and, according to the old 1cars text, a sleeping place. It tilted forward to give access to the engine and gearbox. Equipment was simple: manual window winders, electric wipers, sun visors, mirrors and storage boxes for tools and personal items. Electrical power came from a G-271 generator. The driving position was practical rather than comfortable, and cold-weather work needed an extra heater.

MAZ-503 variants

The heated-body idea solved a common problem of winter work: wet sand and gravel freezing to the body floor. Body heating later became a common option on Minsk tippers, including the MAZ-5516.

MAZ-503 compared with the flatbed MAZ-500

According to the old 1cars text, the tipper was the most popular of all MAZ-500 derivatives. The flatbed and tractor versions are covered on the MAZ-500 page linked above, and the MAZ-503 specifications page holds the catalogue data.

Working life and collecting today

The MAZ-503 worked on building sites, in quarries and on road construction for decades. It was valued for its payload and the easy access given by the tilting cab. Its simple mechanical design made repairs easy. Its weaknesses were those of the whole MAZ-500 family: a basic cab with poor insulation and high exhaust emissions by modern standards, as the YaMZ-236 predates any Euro norm.

For collectors and museum restorers, the MAZ-503 is a typical working truck of its era. The key checks are the frame rivets and cracks near the spring hangers, the tipping hydraulics, and whether the truck still has its original engine and body type. Parts for the YaMZ-236 and the cab are shared with many other MAZ-500 models, which helps restoration. More trucks from Minsk are listed in the MAZ catalogue, in the history of MAZ and in our selection of the best Soviet trucks.