bulldozer

caterpillar

heavy

machinery

bricks

idling

rev

engine

hum

stop

start

dump

drop

lift

shift

move

rubble

excavate

digger

diesel

equipment

gear

motor

tool

moving

lifting

shifting

carry

carrying

excavating

building

site

derv

powerful

excavator

jcb

crawler

tracked

tractor

blade

push

pushing

backhoe

mine

mining

pit

quarry

trench

dig

digging

idle

build

track