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Discussion Forum

Re: hitachi 120-3 hydraulic problem, need shop manual

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Author  [Modern View]

07-27-2012 16:17:49

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For a manual try, I may be totally wrong in what I say because the machines we get in the UK are often different than the ones sold in the US,if it the same as its UK cousin I doubt if there is anything wrong with the hydraulic pump,the pump on our versions is a single variable flow pump,the oil is dived in the main control valve,the machine has an electronic brain that senses the loads and diverts the pressure accordingly,the control unit seldom gives trouble but it could prove well worth while to remove the multi-plug from it and replug it a few times in case there are any bad connections,if that brings no joy the next best thing to do is have an engineer from the dealer have a look at it,he will have the OBD reader and pinpoint the trouble in minutes,no good pulling the pump to bits for an o'ring in the valve block.

Good luck


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07-27-2012 21:06:14

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 Re: hitachi 120-3 hydraulic problem, need shop manual in reply to AJ., 07-27-2012 16:17:49  
Thanks for the tip, but all tradebit shows is the operators manual for my machine. The machine may have been looked at today, haven't heard yet. I did talk to the dealer shop, their basic attitude is along the lines of "A series 3? Those are obsolete." I have talked to other people with your theory, and Wayne's. I like your theory better, but you know what they say about what you like vs what you get.

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