hi 3doc, I'm having problems with my 120 also . would you send me these schematic also? tntdozer@yahoo.com thank you
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Hitachi Ex120 Problem
- Thread starter spunkeymonkey
- Start date
lucian
Member
you should check the 2 solenoids on top of the pump
I have swithed the wires on these solenoids with no change in the performance. I am looking at the proportional solenoids possibly being the problem?
1979april
New Member
hey my ex120-2 is having same problem,dont really know where to start,i have installed a new rebuilt pump,that I bought ,the angle senser they sent on pump someone cut wires to short where it couldn't be used,so I took mine off my old pump, it like it just keeps stalling out under preasure,I turn angle senser one way and it has some function but under load in stalls out,turn it other way anf it will not do anything,i have cleaned fuel tank,blew out fuel lines ,replaced bad coupling to hyd pump,but I did mange to get it out woods to dry land, please I need help its costing me lost of down time. thks
digger_hunter
Well-Known Member
Hey. PM me your email address and I can send you the correct procedure for setting the angle sensor. It's important you set it correctly as it can give weird problems if incorrectly set.
1979april
New Member
Hey digger hunter it will not let me pm you but my email is bumgarner573@gmail.com any help you can give will be much appreciated thankyou!
miltonprescott
New Member
still having problems hitachi ex100
Hi 3doc I am having the exact same problem with my excavator I need to check the fork behind the angle sensor and it is not moving by hand. when I hook the ohm meter up I am only getting just under 1 volt. All fluids and any other possibly obvious problems have been check as well can you give me Any more suggestions
Hi 3doc I am having the exact same problem with my excavator I need to check the fork behind the angle sensor and it is not moving by hand. when I hook the ohm meter up I am only getting just under 1 volt. All fluids and any other possibly obvious problems have been check as well can you give me Any more suggestions
EDDIE.GT
Member
same problem...but at ex120-5......
Here is a breakdown of your pump, the two solenoids are up on top, release the pressure in the hyd tank before you swap them.
Hey can you send me this pic please? I cant see the numbers from here thanks
ydeelhis@gmail.com
EDDIE.GT
Member
ok...tq....my machine is ok when i release the pressure in the hyd tank...
The small filter on cap hyd. tank is neede to change . ...tq..englis broken sory
The small filter on cap hyd. tank is neede to change . ...tq..englis broken sory
[TEST] I bought a ex 120 not sure if it is a -2 are -3 I was told it was a -3 . there are no ser. # on frame are cab any one know how to find out . I am having a problem when I travel the motor slows down, but if I move ant hand controls rpms pick up and travel speeds up .
New to this; I was looking on e-bay and there is a conversion kit has anyone Install one and what is the pros and cons . I bought this machine for farm use clean ditches and remove some trees and later dig a pond. The machine is being used now but has some small problems the guy I bought the machine from just changed the computer out and has no change because it would not hold rpms had to keep hitting buttens .
Hi all, I have a problem with my 120-2 also, the step motor for the revs started making grinding noises the other day and it wouldn't rev up, I've put a new step motor on it now and it still won't rev up although there's no grinding noises now, is there anything else I should be doin? Could anyone help me out please
digger_hunter
Well-Known Member
Wouldn't recommend the kit! It slows down the machine and your fuel consumption goes up as well!
Cal from NH
New Member
I fixed mine
1994 Ex120-2 Mine had a poor power problem as some others describe and oddly enough it was intermittent. The engine RPM would stay up but the hydraulics would slow down, sometimes so badly that the machine wouldn't travel up a small incline even though the engine was wound right out. It turned out to be a fuel supply problem. A plugged up screen inside the banjo bolt that holds the fuel line from the tank onto the water separator. It was confusing since the engine wouldn't loose rpm and I knew the fuel filter was clean so I thought it was a hydraulic control problem at first but testing the DP sensor, angle sensor etc. produced nothing. When the engine is starving for fuel it dosen't drag down the engine rpm since the pump computer reduces the pump load on the motor to maintain the engine rpm as first priority. The banjo bolt screen should be removed & cleaned whenever the fuel filter is getting replaced. I pulled the screen out with a pick & blew it out with compressed air. I don't think it's a good idea to eliminate it since it catches the big chunks before the lift pump down low on the motor.
One other problem I had a year ago was that intermittently the hydraulics would "lock up" as best I can describe it when I would swing or travel. I would be swinging and then bang!!! the swing motor would just lock up and everything would come to a violent stop, same with traveling. The fix was the 3 wire connector at the pressure sensor on the bottom of the pump. The wire insulation had receded back away from the connector leaving 1/2" of bare wire at the connector (difficult to notice with the oil & dust coating), when the carriage would move the wires would wiggle enough to arc across the wires & give a high pressure signal to the pump control mod, the mod. would then dump hydraulic pressure and everything would bang to a halt for a second then operation would resume as normal. I disassembled the connector & soldered in some new wire leads & it's worked reliably since.
I'm just an auto mechanic playing excavator operator building a house for my family, I'll sell it when I'm done. Hope this helps someone.
1994 Ex120-2 Mine had a poor power problem as some others describe and oddly enough it was intermittent. The engine RPM would stay up but the hydraulics would slow down, sometimes so badly that the machine wouldn't travel up a small incline even though the engine was wound right out. It turned out to be a fuel supply problem. A plugged up screen inside the banjo bolt that holds the fuel line from the tank onto the water separator. It was confusing since the engine wouldn't loose rpm and I knew the fuel filter was clean so I thought it was a hydraulic control problem at first but testing the DP sensor, angle sensor etc. produced nothing. When the engine is starving for fuel it dosen't drag down the engine rpm since the pump computer reduces the pump load on the motor to maintain the engine rpm as first priority. The banjo bolt screen should be removed & cleaned whenever the fuel filter is getting replaced. I pulled the screen out with a pick & blew it out with compressed air. I don't think it's a good idea to eliminate it since it catches the big chunks before the lift pump down low on the motor.
One other problem I had a year ago was that intermittently the hydraulics would "lock up" as best I can describe it when I would swing or travel. I would be swinging and then bang!!! the swing motor would just lock up and everything would come to a violent stop, same with traveling. The fix was the 3 wire connector at the pressure sensor on the bottom of the pump. The wire insulation had receded back away from the connector leaving 1/2" of bare wire at the connector (difficult to notice with the oil & dust coating), when the carriage would move the wires would wiggle enough to arc across the wires & give a high pressure signal to the pump control mod, the mod. would then dump hydraulic pressure and everything would bang to a halt for a second then operation would resume as normal. I disassembled the connector & soldered in some new wire leads & it's worked reliably since.
I'm just an auto mechanic playing excavator operator building a house for my family, I'll sell it when I'm done. Hope this helps someone.
mhlak
Member
I have an ex 120-3 having the same problem, sometimes it is really slow then it changes to way to fast. I unplugged the two controls on the top of the pump trying to test the swash plate angle sensor and the machine doesn't sound like it goes to full angle but it stalls the engine when any function is used then the voltage is .909 volts on the volt meter. need some help got any ideas?
mhlak
Member
I tried to adjust the swash plate sensor it only had .9 volts loosened the screws and moved it and the voltage doesn't change.
so I took it off and moved it by hand and the voltage stays the same. so ordered a new one , does this sound like I found the problem?
so I took it off and moved it by hand and the voltage stays the same. so ordered a new one , does this sound like I found the problem?
mhlak
Member
how many volts should go to the angle position sensor ?
daddieboy
Well-Known Member
Hello rgl726 I need some of your help in solving some problems on a Hitachi ex200-2 machine, I have not seen you online but I am trying to create a way I can communicate with you if that's possible.
Thanks in advance.
Thanks in advance.