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The Cat PM312 is an efficient, highly maneuverable milling machine with a cutting width of 1225 mm (48.2 in) that performs controlled full-depth removal of asphalt and concrete pavements in a single pass. Integrated Cat GRADE and the latest System K rotors deliver performance, productivity and cutting precision. A comfortable operator environment puts intuitive controls at your fingertips, while long service intervals and easy maintenance access simplifies service. While designed for a single operator, the PM312 includes added features for supporting ground personnel. Many options are available to enhance machine versatility when optimum maneuverability or high production capabilities are required.

Cat Specs

Cutting System

Milling Width
48.2 in
Maximum Milling Depth
13 in
Rotor Speeds
97 / 109 / 121 rpm
Number of Bits


Operating Weight
47407 lb
Transport Weight
46506 lb

Power Train

Rated Power
343 HP
Maximum Travel Speed
3.4 mile/h
Maximum Milling Speed
108 ft/min

Service Refill Capacities

Hydraulic Tank
14.5 gal (US)
Diesel Exhaust Fluid (DEF) Tank
12.4 gal (US)
Engine Oil
7.9 gal (US)
Water Spray System Tank
332.9 gal (US)
Cooling System
16.9 gal (US)
Fuel Tank
137.9 gal (US)


Operating Length - Conveyor Up
36.45 ft
Height - Canopy
12.3 ft
Maximum Truck Clearance
15.42 ft
Minimum Right Cutting Radius
6.3 ft
Minimum Left Cutting Radius
13.58 ft
Conveyor Swing
60 degrees from center
Transport Length
30.58 ft
Transport Height
9.84 ft
Transport Width
8.33 in
Operating Width
8.33 ft