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  1. T

    Hitachi ex120-2 hydraulics overheating.

    I’ll try that, I tried it without someone holding the key but didn’t work.
  2. T

    Hitachi ex120-2 hydraulics overheating.

    Copy, got it back on and still won’t start. I checked the battery relay and have 24v leaving it. All fuses are good and everything on the starter is tight. I can hear a faint click at the starter. What else should I check? Also, found the control cable at the T-link for the governor control...
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    Hitachi ex120-2 hydraulics overheating.

    Machine had no start today but has good power, when looking around I found this braided copper strap loose on one end. Should i reattach it to the starter mounting bolt or should it go somewhere else. Also would this cause or contribute to the low throttle issue after idle?
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    Hitachi ex120-2 hydraulics overheating.

    I replaced the hydraulic fluid and filters and the machine had not had any of the inconsistencies/jerky functions unless it is getting hot. I have noticed when it has idled for 10-15 min the power is reduced to about 60-70% when at full idle. If I shut it off for a few minutes and return it to...
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    Hitachi ex120-2 hydraulics overheating.

    I have heard you lose a little power when making the conversion. Is that true?
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    Hitachi ex120-2 hydraulics overheating.

    @Diesel Dave I will check for that. What would cause the hydraulics to be inconsistent? Notice the last few days when I let it idle for 10-15 mins when I start working it again the hydraulics are very jerky, barely move or very jumpy. Also this is after it running smooth for 3-4 hours. If I...
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    Hitachi ex120-2 hydraulics overheating.

  8. T

    Hitachi ex120-2 hydraulics overheating.

    I was basing my assumption it was starting to run hot because I have a komatsu feller buncher and have been told by multiple operators to keep temps below 160°f if possible. It’s been cool weather and it was running that hot I was concerned when it warms up it would get too hot. Just wanted to...
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    Hitachi ex120-2 hydraulics overheating.

    Here’s the link.
  10. T

    Hitachi ex120-2 hydraulics overheating.

    I have a video if there’s a way to send it to you. Maybe email?
  11. T

    Hitachi ex120-2 hydraulics overheating.

    Just checked again and everything is the same. Long blinks 10’s and short blinks 1’s? It’s a grey market machine. Not sure if this changes anything?
  12. T

    Hitachi ex120-2 hydraulics overheating.

    Disregard this, I blew a hose yesterday and it was low on oil. I think it just had air in the lines.
  13. T

    Hitachi ex120-2 hydraulics overheating.

    Just started the machine up after checking codes and now the hydraulics are very slow and choppy. Hasn’t done this before. Could checking the codes have caused something to short out?
  14. T

    Hitachi ex120-2 hydraulics overheating.

    Got the codes, 4, 20, 31, 35, 37, 38.
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    Hitachi ex120-2 hydraulics overheating.

    Sounds good, I will check tomorrow. Is this what you are referring to?
  16. T

    Hitachi ex120-2 intermittent slow hydraulics for all functions.

    Did you guys figure out the hydraulic issues? I have a ex120-2 and have sorted out a few issues. It now the hydraulics are getting hot 160°-170° after running 1hour. Lots of power and functions are fast. If I run in E mode it runs around 140°-150°. Curious what you figured out and any advice is...
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    Hitachi ex120-2 hydraulics overheating.

    Hi all, I have a 1994 Hitachi ex120-2 that is running hot on hydraulics after about an hour. No alarms or indicators saying it’s too hot. Checked with a temp gun and it’s around 160°-175°. Oil cooler is cooling the oil difference of about 10-12°. Pilot pump like has surge of chatter, one tick...
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    • hitachi hitachi ex120-2 hydraulic
    • Replies: 43
    • Forum: Excavators
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    Hitachi 120 Hydraulic Problems....Help Please!

    Hey there, do you by chance still have the service manual for the hitachi ex120-2? Having some hydraulic issues. After about 2hours of running fine it starts to loose power and hydraulics (all functions) start cutting out. Lots of chatter around the valve control area. Thinking the issue may...
  19. T

    Hitachi 120 Hydraulic Problems....Help Please!

    Hey there, do you by chance still have the service manual for the hitachi ex120-2? Having some hydraulic issues. After about 2hours of running fine it starts to loose power and hydraulics (all functions) start cutting out. Lots of chatter around the valve control area. Did you have similar...
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