Hitachi ex200-3 hissing noise

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    Gday all, have been looking around here for quite a while have found great info that’s helped solve lots of issues with some machinery we own used around our place,thanks for all the info…
    Have some problems with the old ex200…has about 15000 hrs it has started feeling weak and has developed a hissing noise through the oil cooler pipes,also now has high pitched sound when operating and a rattling sound I think from the pump after its used for a while…i am not sure if I should keep spending on it or use the money towards something else…any help will be greatly appreciated..

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