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Hitachi Ex120 Problem

P

perfectoblanco

Member
Joined
Oct 6, 2015
Messages
15
Location
india
spunkeymonkey said:
I have a Hitachi EX120-1. It started stalling when the hydraulic pump was under load. At the same time, the engine started to run hot, and the hydraulics became really fast. Various people have looked at it, one said the pump was u/s, so I took it off and took it to a pump specialist, who couldnt find anything at all wrong with it! I believe it is an hydraulic problem, rather than a fuel problem, because the engine recovers its revs straight away when you release the lever. At some time in its former life, a lot of wires to the pump had been cut, and rejoined by twisting together, the machine worked for many years like this. I have remade all the connections, and it has slightly improved how the machine works, you can at least dig now, although the engine still stalls when a ram goes to its full extension or retraction, as though the pump is at full swash. Has any one else experienced anything like this? All suggestions gratefully recieved!
Click to expand...

had the same issue with stalling under load
after changing fuel lines, filter, rebuilding the fuel pump and hydraulic pump which did nothing to fix the issue what fixed it was a simple turbo replacement event though the old one was still in good condition with no oil leaks and air still blowing.
replace your turbo and check it because after all the money spent trying to solve the problem a simple turbo replacement did the trick.
 
S

Sean R

Member
Joined
May 23, 2016
Messages
13
Location
Canada
Hi Val,
Did you ever end up getting the manual for your ex. Would you mind sharing if you did? Thx,
 
B

Big D 808

Member
Joined
Dec 14, 2012
Messages
12
Location
Hawaii
spunkeymonkey said:
I have a Hitachi EX120-1. It started stalling when the hydraulic pump was under load. At the same time, the engine started to run hot, and the hydraulics became really fast. Various people have looked at it, one said the pump was u/s, so I took it off and took it to a pump specialist, who couldnt find anything at all wrong with it! I believe it is an hydraulic problem, rather than a fuel problem, because the engine recovers its revs straight away when you release the lever. At some time in its former life, a lot of wires to the pump had been cut, and rejoined by twisting together, the machine worked for many years like this. I have remade all the connections, and it has slightly improved how the machine works, you can at least dig now, although the engine still stalls when a ram goes to its full extension or retraction, as though the pump is at full swash. Has any one else experienced anything like this? All suggestions gratefully recieved!
Click to expand...


You may have a broken spring in your main pressure relief valve. Have you checked your pressures?
 
L

lendell14

New Member
Joined
Aug 22, 2016
Messages
2
Location
Trinidad
lenny

Hi guys,I'm looking at purchasing a 200- 2 fir a meagre price, this machine is in need of an overhaul. The electrical wiring is bad so I'm thinking I may have to change the harness and computer if I buy it, I learnt from the thread that wajax sells them but what about DP sensor,angle sensors and pump solenoids, can anyone direct me to a reliable supplier that they have bought stuff from,seeing a lot of stuff online but not sure who's reliable. I'D really appreciate some feedback. Please email me at katwaroolendell@gmail.com
Kind regards
Cheers!
 
W

weedwards

Member
Joined
Sep 17, 2012
Messages
10
Location
Minden,LA.
Purchase conversion to kit to change EX120-2 from computer control to hyd. control, engine under excessive load. Need help on proper installation instructions.
 
D

daddieboy

Well-Known Member
Joined
Mar 20, 2012
Messages
105
Location
Grenada
Occupation
Architect
Hey willie59 do you by chance know how to install a travel alarm on the Hitachi ex200-2 excavator
 
W

wilko

Senior Member
Joined
Mar 4, 2005
Messages
362
Location
Oregon
Weedwards, please give us a review of that conversion kit when you get it sorted out. I'd really like to know how well the machine works with that done.
 
T

tommurphy73

Member
Joined
Dec 1, 2017
Messages
16
Location
Ireland
Hi,

I have a similar problem with my HITACHI 120-2 Excavator. I was wondering if anyone had the Electrical and Hydraulic diagrams for this machine that they could share

Regards
Tom
 
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