Mikeyp756
Well-Known Member
Yes Nate appears conversion kit does not work. Think we’re both in the same boat.
. Don’t know what link codes are
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Proportional solenoid valve
- Thread starter Mikeyp756
- Start date
excavator
Senior Member
I hate to say this but I believe that the biggest problem with the Hitachi dash 2 machines are people who know very little about them are trying to fix them. They were Hitachi's first venture into a computerized machine and they had some issues. But if you have the diagnostic computer, either DR EX or DR ZX, what ever version, generally speaking a good troubleshooting mechanic can figure them out. But you have to understand them and you have to be there at the machine, guys like mg2361, lachua and a few others can offer good advice but without being there it's nearly impossible to get them up and running. And throwing parts at them without knowing how to properly install and adjust them does nothing but cost a lot of money with no good results.
natemarine
Active Member
I really wish I had that option but on my 120-3 being a grey market machine I can't find anyone willing or able to do these diagnostics.... even dealerships ...I never hesitate to pay a pro to do something like this but I absolutely cannot find one in Maryland.....any suggestions?
excavator
Senior Member
That is totally crazy and should not be a problem, it's the same exact machine as a 490E Deere. While Hitachi had a 120-2 and -3 machine Deere had the early and late serial number 490E, only difference between Deere & Hitachi is Deere used their own engine. Maybe you'll have to paint it Deere colors and just call it a 490E, are there no independent mechanics in the area to look at it?
Mikeyp756
Well-Known Member
I wasn’t blaming anybody About A sensor I just wanted to make sure I was doing it right. Considering I was told by a professional the opposite of what it says in the manual. I put the sensor on with little dot facing away from the label and The highest reading I could get was 4.1 I didn’t just jump on his excavator and try to fix it like an idiot. I’ve had five so-called professionals work on this thing one from the highest rated company around came out looked at the thing for 45 minutes and said he couldn’t figure it out.because it’s a gray market machine. But I received a bill for $800. Last guy came out and did some stuff and now won’t return my calls. I believe I’ve made more improvements than any of them.
natemarine
Active Member
I agree its crazy but the local john deere dealer said they could do it and the tech came out couldn't figure out where to plug it in and told me if there wasn't any check engine lights on he couldn't read anything any way.... charged me 600 for the trip regardless just to come out and provide no answers. The hitachi dealer won't even touch it, they curl their nose up and say it's a gray market machine and basically cannot help me at all. They turned me on to a mechanic who was supposed to be able to help. He came out and toyed around a few times no luck.... Over the last two years I've spend over 5 grand on guys who are supposed to be the guys that know what they are doing... my guy whos working on it now is a little more old school fixing things doesn't depend on the computer plug in so much but it would be nice to be able to run a diagnostic thats for sure
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mg2361
Senior Member
Just an FYI for anybody out there. The dot on the angle sensor needs to be opposite the wire harness of the sensor. The little spring clip that sits on the "A" sensor shaft that fits into the slot inside the pump needs to be tight (should be replaced anytime the "A" sensor is replaced). Also when the sensor is out put a screwdriver into the slot of the pump and try and turn it back and forth. If it turns more than a few degrees then there is wear inside the pump in the feedback linkage.
"Some issues" is an understatement. Yes, I agree with excavator that these machines are extremely complicated considering their vintage. And yes trying to troubleshoot from the seat of our pants can be almost impossible at times. Like excavator, I believe if I'm not there to touch, feel, see, taste, smell and hear the machine, then troubleshooting with an individual who does not understand the inner workings of these machines can be frustrating at best. Anybody wanting to work on their own machines should not even consider touching them without purchasing a tech manual. Diagnostic software would be highly recommended also because it can speed up the troubleshooting process as well. I would personally recommend buying a Deere 490E Operation and Test manual for the EX120-2, -3 Hitachi's because they are easier to use and understand than the Hitachi manual.
For those of you that have had negative experiences with dealers or other professionals will need to be patient with our recommendations because like mentioned earlier we are not there. I myself will try to throw out some simple things to do on these machines to help narrow down issues without having expertise or special tools, even though that is not the way I would approach troubleshooting that particular machine.
Sorry, venting
LACHAU
Senior Member
Thank for your mentions.
Anyway, I think model EX of HITACHI is too familiar. we have used the tools just for ZX... series
LACHAU
Senior Member
...and almost engine install on HITACHI machine are ISUZU. You should use the IDSS tool for diagnostic.
excavator
Senior Member
Isuzu in the -2&3 machines are not electronic engines so no diagnostic software needed.
excavator
Senior Member
Just an FYI for anybody out there. The dot on the angle sensor needs to be opposite the wire harness of the sensor. The little spring clip that sits on the "A" sensor shaft that fits into the slot inside the pump needs to be tight (should be replaced anytime the "A" sensor is replaced). Also when the sensor is out put a screwdriver into the slot of the pump and try and turn it back and forth. If it turns more than a few degrees then there is wear inside the pump in the feedback linkage.
Some of the early Hitachi manuals had it backwards. Thanks for explaining the proper way.
"Some issues" is an understatement. Yes, I agree with excavator that these machines are extremely complicated considering their vintage. And yes trying to troubleshoot from the seat of our pants can be almost impossible at times. Like excavator, I believe if I'm not there to touch, feel, see, taste, smell and hear the machine, then troubleshooting with an individual who does not understand the inner workings of these machines can be frustrating at best. Anybody wanting to work on their own machines should not even consider touching them without purchasing a tech manual. Diagnostic software would be highly recommended also because it can speed up the troubleshooting process as well. I would personally recommend buying a Deere 490E Operation and Test manual for the EX120-2, -3 Hitachi's because they are easier to use and understand than the Hitachi manual.
When they were "new" they had some issues, since they are now almost 30 years old I think a large part of the issues are going to be wiring harness related. I find quite a few harness ends having problems and should be replaced. They are available from Deere.
For those of you that have had negative experiences with dealers or other professionals will need to be patient with our recommendations because like mentioned earlier we are not there. I myself will try to throw out some simple things to do on these machines to help narrow down issues without having expertise or special tools, even though that is not the way I would approach troubleshooting that particular machine.
Sorry, venting
excavator
Senior Member
Not sure why when I added to mg2361s post it doesn't show up as added but I'll repeat here. Some of the early Hitachi books had the wrong info for installing the A sensor, they showed the dot towards the harness. And I agree, I use the Deere manuals far more than the Hitachi's on these machines. We also have to remember that these machines are close to 30 years old, that's 30 years of heat and oil and often bad mechanics working on them. I've found that most issues are caused by bad wiring harnesses, usually the harness end where it plugs into a sensor or valve ect. The harness ends are available from Deere.
LACHAU
Senior Member
Agree with your opinions.
Regarding to Technical Manual, I never have used the J.Deere manual so I have no idea!! but I have a feeling that HITACHI's documentation is easy to understand also. I attached file for your reference.
https://www.mediafire.com/file/o8dxek1yvr4h5tm/EX120-3_T135E-00_Technical_Manual.pdf/file
LACHAU
Senior Member
Exactly. HITACHI manual said like that.
Unfortunately, the "A" sensor part made in China usually is not like that!!!
mg2361
Senior Member
Back to Mike's issue. Mike, the easiest thing to do is Tee into one of the pilot lines that go to the pilot caps (that stroke the spools) on top of your control valve. Fully activate that function you are Tee'd into and read the pressure. Post the results. Should be in the neighborhood of 700 psi.
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LACHAU
Senior Member
Very simple way to check. You should try to pull-out 02 connector of SWING PSV and TRAVEL PSV.
After disconnection of 02 PSV, the SWING and TRAVEL will be faster than as it was.
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Mikeyp756
Well-Known Member
Thank Lachau I’ll try that. What will that tell me. Bad solenoid? And what if they don’t get faster.
LACHAU
Senior Member
That means the controlling of PSV is out of order! You should check the wires, connectors, PVC controller...
You should check the VARIABLE PRESSURE COMPENSATED VALVE which install in front of main control valve. They might be stuck at closed status!!
LACHAU
Senior Member
For more detail.
Mikeyp756
Well-Known Member
Thanks Lachau, that’s some good things to check. Hope I can get on it today but still need to replace the psv I removed. Which was stuck. And I noticed someone had installed a nonadjustable psv. In the swing parking Spot. Which I ordered and should receive soon.