I have an old EX30 Around 1990, and it was working fine around the house but now it will only work for 15 minutes from cold before it looses all its digging power. But it will still track and blade down at full power. This led me to think servo pump issues I have changed the oil and all the filters and checked all the suction lines, today I even took off the servo pump but can't see any issues. I rebuilt it and after 15 minutes exactly the same. I can get a new servo pump but the fact it works well when first started it makes me suspect it could be something else. Does anybody have any ideas?
Hitachi EX30 loosing power
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