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120 ex excavator will not run under load of operation

larry dye

New Member
Joined
Oct 5, 2015
Messages
3
Location
Tn
my 1998 ,120 excavator , will run fine as can be but when I move my joy sticks to dig or pick up heavy things it overload the engine and smoke black smoke and go dead !!!! I have changed fuel, oil , hyd & air filter, serviced them all up , check all fuel line connections for any leaks or drawing in air, was wondering if it could be in fuel pump, or needs new injectors ?? Need to get up and running bad ????
 

jaytech

Well-Known Member
Joined
Aug 22, 2011
Messages
47
Location
jackson ms
if its a weak motor check banjo filter and turbo system
if motor recovers quickly after you release the load then its probably not fuel
probably pump control issue
there is a ton of great info on this site you need to start digging into old threads
you could start by searching for "hitachi ex120 problem"
 
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