Dozers
Komatsu D31EX

Direct injection fuel system. All-speed mechanical
governor. Forced lubrication driven by gear pump.
Full-flow for lube purification. Dry-type air cleaner
with automatic dust evacuator and dust indicator.
24 V / 5.5 kW electric starter motor. 24 V / 25 A
alternator. 2 x 12 V / 60 Ah batteries.

Type  Water-cooled, 4-cycle, emissionized
Aspiration  Turbocharged and air-to-air aftercooled
Number of cylinders  4,Bore 4.02'' 102 mm,
Stroke 4.72'' 120 mm
Piston displacement 240 in³ 3.9 ltr
Net flywheel horsepower*:    
SAE J1349@ 2000 rpm 75 HP 56 kW
DIN 6270@ 2000 rpm 76 PS 56 kW
Net maximum torque: @ 1300 rpm 284 lb•ft 39.2
kg•m
384 N•m
Governor  All-speed, mechanical
Filter  Full-flow
* Net flywheel horsepower output for standard
engine (SAE J1349) including air cleaner, alternator
(not charging), water pump, lubricating oil pump,
fuel pump, muffler, and fan.
Available at
Hilltop Tool Rental