MAZ-537 (МАЗ-537) - a heavy tractor produced from 1960 to 1963, when production moved to the KZKT plant and continued until 1990.
Version overview:
MAZ-537A (МАЗ-537А) - tractor-trailer, equipped with a winch with a 15/30 t pull and a rope length of 100 m
MAZ-537G (МАЗ-537Г) - tractor equipped with a winch designed for towing trailers weighing up to 68000 kg
MAZ-537D (МАЗ-537Д) - hybrid semi-trailer tractor (self-propulsion is provided by electric energy produced by a generator driven by the vehicle's engine)
MAZ-537E (МАЗ-537Е) - semi-trailer tractor with hybrid drive (self-propulsion is provided by electricity produced by a generator driven by the vehicle's engine), allows towing active semi-trailers weighing up to 65,000 kg
[MAZ-537K (МАЗ-537К) - chassis for truck cranes
MAZ-537L / KZKT-537L (МАЗ-537Л/КЗКТ-537Л) - a special tractor with a JaMZ-240NM-1B engine (ЯЯМЗ-240НМ-1Б) designed for towing aircraft weighing up to 200 t on airfields, or trailers weighing 75 t on fixed roads
MAZ-537M / KZKT-537M (МАЗ-537М / КЗКТ-537М) - JaMZ-240NM-1B (ЯМЗ-240НМ-1Б) tractor with winch
MAZ-537R (МАЗ-537Р) - tractor for transporting long loads (tree trunks, pipes) with an outlet to drive the trailer's trailer
Source: http://legion.wplus.net
Version overview:
MAZ-537A (МАЗ-537А) - tractor-trailer, equipped with a winch with a 15/30 t pull and a rope length of 100 m
MAZ-537G (МАЗ-537Г) - tractor equipped with a winch designed for towing trailers weighing up to 68000 kg
MAZ-537D (МАЗ-537Д) - hybrid semi-trailer tractor (self-propulsion is provided by electric energy produced by a generator driven by the vehicle's engine)
MAZ-537E (МАЗ-537Е) - semi-trailer tractor with hybrid drive (self-propulsion is provided by electricity produced by a generator driven by the vehicle's engine), allows towing active semi-trailers weighing up to 65,000 kg
[MAZ-537K (МАЗ-537К) - chassis for truck cranes
MAZ-537L / KZKT-537L (МАЗ-537Л/КЗКТ-537Л) - a special tractor with a JaMZ-240NM-1B engine (ЯЯМЗ-240НМ-1Б) designed for towing aircraft weighing up to 200 t on airfields, or trailers weighing 75 t on fixed roads
MAZ-537M / KZKT-537M (МАЗ-537М / КЗКТ-537М) - JaMZ-240NM-1B (ЯМЗ-240НМ-1Б) tractor with winch
MAZ-537R (МАЗ-537Р) - tractor for transporting long loads (tree trunks, pipes) with an outlet to drive the trailer's trailer
Source: http://legion.wplus.net