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Hitachi ex120-5 slow hydraulics (limp mode)

A

anton_baydak

Member
Joined
Apr 10, 2024
Messages
11
Location
Washington
I got a ex120-5 a year ago with 11k hours. It ran strong till I parked it for few months. Now everything is slow tracks arm movements. The engine rpm works great. The turtle button never worked it was always one speed. I tried to read the ecu codes manually by connecting 2 top ports from a 4 port diagnostic connector by the fuse box. It blinks 8 times then pause then 9 then 8 then 9 on repeat. What does that mean?
 
LACHAU

LACHAU

Senior Member
Joined
Aug 11, 2009
Messages
995
Location
Saigon, Vietnam
anton_baydak said:
What does perform retrial B mean. Is this the sensor. They are talking about? Because I can’t find angle sensor for 120-5
Click to expand...
To do RETRIAL B you must have a tool called Dr.EX or Dr.ZX.
See the attached file for more details.
To buy A sensor (angle sensor), let go to Ebay. :p

www.ebay.com

US Angle Sensor 4444902 for Hitachi Excavator EX120-2 EX120-3 EX200-2 EX200-3 | eBay

For Kobelco SK200-6 KDRDE5K-31/30C50-122 Solenoid Valve Ass'y YN35V00039F1 New. For Komatsu Model PC450L Hydraulic Gear Pump with 708-2H-00450 1PC. Fuel Injection Pump with 319-0678 New For CAT 3190678 Engine C7 C9.
www.ebay.com


EX120-2 A sensor.png
 

Attachments

  • EX-2 Series Retrial A & B Procedure.pdf
    140 KB · Views: 12
A

anton_baydak

Member
Joined
Apr 10, 2024
Messages
11
Location
Washington
LACHAU said:
To do RETRIAL B you must have a tool called Dr.EX or Dr.ZX.
See the attached file for more details.
To buy A sensor (angle sensor), let go to Ebay. :p

www.ebay.com

US Angle Sensor 4444902 for Hitachi Excavator EX120-2 EX120-3 EX200-2 EX200-3 | eBay

For Kobelco SK200-6 KDRDE5K-31/30C50-122 Solenoid Valve Ass'y YN35V00039F1 New. For Komatsu Model PC450L Hydraulic Gear Pump with 708-2H-00450 1PC. Fuel Injection Pump with 319-0678 New For CAT 3190678 Engine C7 C9.
www.ebay.com


View attachment 309992
Click to expand...
My 120-5 does not have that. I looked everywhere
 

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    IMG_0647.jpeg
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  • IMG_0646.jpeg
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LACHAU

LACHAU

Senior Member
Joined
Aug 11, 2009
Messages
995
Location
Saigon, Vietnam
According to the photos you provided, your device is for the Japanese domestic market.
I see you registered with the forum as you are in Washington. I didn't know there were Hitachi excavator for the Japanese domestic market in Washington!

EX120-5 Domestic.png

IMG_0644.png
ScreenShot_20240413134636.png
 
A

anton_baydak

Member
Joined
Apr 10, 2024
Messages
11
Location
Washington
A

anton_baydak

Member
Joined
Apr 10, 2024
Messages
11
Location
Washington
H

HitachiGuy

Member
Joined
Apr 23, 2024
Messages
6
Location
British columbia
T in gauges to the hoses that go to the back of the regulators . Should see pressure increase when moving the controls. If no pressure increases check the solenoids for gumming up inside . Can always bypass the solenoids
 
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