Hitachi Ex120 Problem

[rgl726]

Thanks 3doc,

i trace all the wiring linking the all the pump solenoid and sensors and all has a continuity inside the cab with no ground.

How will i test this sensors if they are good or bad?

Angle sensor
pressure sensor
rpm sensor
and the sensor in the control valve

 

[-3Doc]

Thanks 3doc,

i trace all the wiring linking the all the pump solenoid and sensors and all has a continuity inside the cab with no ground.

How will i test this sensors if they are good or bad?

Angle sensor
pressure sensor
rpm sensor
and the sensor in the control valve

Send me a PM and I will get the info to you.
Thanks.

 

[rgl726]

hi -3doc,

i would like to ask where is the homerun of the swing dampener sensor?

i was able to trace one wire to the pvc but i cant find the other one in the pvc or ecu?

i was able to trace it only up to the smj connector but from smj to the pvc or ecu i cant find it?

is the other wire going somewhere else rather than the pvc or ecu?

 

[-3Doc]

hi -3doc,

i would like to ask where is the homerun of the swing dampener sensor?

i was able to trace one wire to the pvc but i cant find the other one in the pvc or ecu?

i was able to trace it only up to the smj connector but from smj to the pvc or ecu i cant find it?

is the other wire going somewhere else rather than the pvc or ecu?

Here is wiring schematic.

 

[PBR]

Dose any one know what Code 22 is on a EX120-2 and how to fix it Thanks

 

[Sripola]

Hi guys,

Had a similar problem which i have posted in another thread, but if its any help we had a problem on a 97 Hitachi EX200-3. The machine was overheating after about 20mins of working. Both engine and hydraulic oild were getting very hot and the machine would stall.

So one of the local techies swapped a DP sensor and everything was sorted!

Hope this info helps

 

[Clay35441]

Hi -3 Doc,

New here but having same problems as everyone else. Cylinders on 120-2 max out and machine dies. I've traced entire wiring harness. Repaired wiring harness to solenoid valves but still doing the same thing. Are there any codes that the computer can give as to the problem? How do I get the computer to give me the codes?
Please help.

 

[Clay35441]

I failed to mention that there is 25 volts going to both solenoid valves on the yellow wires but I'm not reading any voltage on the engine speed sensor that's next to the angle sensor.

 

[rgl726]

code 22 is problem with the angle sensor, high speed solenoid and, PVC.

 

[-3Doc]

Hi -3 Doc,

New here but having same problems as everyone else. Cylinders on 120-2 max out and machine dies. I've traced entire wiring harness. Repaired wiring harness to solenoid valves but still doing the same thing. Are there any codes that the computer can give as to the problem? How do I get the computer to give me the codes?
Please help.

Clay send me a PM and I will help you with some printed procedures.

 

[Clay35441]

Clay send me a PM and I will help you with some printed procedures.

Not sure how to send a pm. Here's my email address
clay_smalley@msn.com

 

[Clay35441]

Not sure how to send a pm

 

[dale]

ex120-2 throttle motor will not respond, have repalced motor, sensor, and rebuilt circut board. throttle motor only humes for a few seconds and then stops, will not move. I was also told if you unplug the motor and turn the key on this will cause the circut board to burn up. Is the true?? need help

 

[Clay35441]

-3doc
Thanks to your help I've found that my problem is the Q5 resistor inside my pvc. Where can I buy replacement resistors?

 

[auy_tong2]

hi can somebody help me??? i need a ex120-2 repair manual, schematics, the hydraulics system is very slow, the hydraulics is like on the limp mode...

 

[rgl726]

hi can somebody help me??? i need a ex120-2 repair manual, schematics, the hydraulics system is very slow, the hydraulics is like on the limp mode...

maka ayo ta ana sir.

 

[auy_tong2]

im looking for a manual sir

 

[auy_tong2]

up up

 

[-3Doc]

Send me a PM and I can help you with manuals.

 

[Clay35441]

Can anyone tell me what the ohm and voltage ratings are on the Q5 transistor are inside the pvc. I'm having trouble finding the transistor because there aren't any markings on it. EX 120-2