The Caterpillar 120H motor grader was introduced in 1995 in the USA and Australia as the replacement for the Caterpillar 120G. Production began in Brazil a year later.[edit] Features
The 120H has 3116 turbocharged engine with variable horsepower (HP) or engine power management. Variable horsepower units produce either 128 or 140 HP, while those with engine power management produce 125 or 140 flywheel horsepower (FWHP). It has an eight speeds forward, six reverse direct drive powershift transmission with electronic control. It comes standard with a PPPC hydraulic system, modified operator station, and adjusted blade positioning. It is available with integrated engine compartment doors and a contour seat.
The 120H was manufactured in the USA, with 4MK, 6NM, or 6TM serial number prefix; in Australia, with a 2AN prefix; and in Brazil, with a 5FM or 9YR. It was also manufactured with a 9FN prefix.
The 2AN and 4MK have variable horsepower. All other units have engine power management.
[edit] Modifications
Between 1995 and 1997 Caterpillar added radiator cleanout access covers and new battery boxes, and modified the fuel sending unit, beginning with 2AN00082, 5FM00550, 9YR00270, 9FN00439, 4MK00287, and 6TM00356. At the same time the 2AN, 9YR, 4MK, and 6TM units received a certificate of emissions compliance.
In 1996 all American units added extended life coolant and dual fuel filters, beginning with 4MK00216, 6NM00255, and 6TM00345.
In 1997 Cat added nylon plastic drawbar/circle wear inserts, scheduled oil sampling ports, and an optional 12-volt power port, beginning with 2AN00104, 5FM00800, 9YR00330, 9FN00471, 4MK00404, and 6TM00366. At the same time all units, except 2AN, received a standard circle drive slip clutch.
