Hitachi EC 89 Air Compressor Problem

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Old 05-31-13, 02:51 PM
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Hitachi EC 89 Air Compressor Problem

I have a Hitachi EC 89 air compressor that seams to be leaking oil through the dipstick. Is there supposed to be a hole in it because in the top, there is a hole where it seams to be leaking. Should I replace the dipstick?
 
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Old 05-31-13, 07:21 PM
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More likly there's pressure leaking back into the crankcase.
Often times it's one of three things, valve body, rings or the check valve.
Hitachi - Hitachi Parts EC12
 
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Old 06-01-13, 12:04 PM
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Where is the check valve on this air compressor?
 
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Old 06-01-13, 01:46 PM
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I just checked the check valve and it seams to look fine. How can you tell if a check valve needs to be replaced?
 
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Old 06-01-13, 03:19 PM
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The check valve allows air to be pumped into tank and then keeps it there. The check valve would not be the cause of oil coming out of the engines dip stick tube.

What type of unit is this ?

Too much pressure inside the crankcase would cause that. That would be a rings or breather issue.
 

Last edited by PJmax; 06-01-13 at 05:07 PM. Reason: Clarification
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Old 06-01-13, 03:44 PM
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This is an electric air compressor with two hotdog style tanks on its side.
 
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Old 06-01-13, 05:11 PM
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Usually if the check valve leaks..... you'll get air leaking back into the compressor so that you would hear the leaking long after the comp stopped running.

Does the oil come out while it's compressing..... that would suggest a ring failure.

You asked earlier about a hole in the dipstick tube. That would be an air breather hole for the crankcase.

Hitachi - Compressor Check Valve
 
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Old 06-01-13, 05:24 PM
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The oil is spraying out in little droplets and it doesn't compress any air at all. The gauge doesn't show that it is putting any air in the tank even when it has been running for 15 - 20 minutes.
 
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Old 06-01-13, 05:42 PM
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it doesn't compress any air at all.
That's a pretty important detail and should have been in your first post.

Still sounds like rings....possibly a reed valve problem too. You will need to pull the head of the compressor to check it out.
 
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Old 06-01-13, 05:46 PM
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I have already pulled the head off and looked. I was looking on a website and they suggested that if it doesn't compress air, that the valve plate should be replaced.

Here is the link to it on that website:
Hitachi - Hitachi Parts EC89

Yeah, it said that the valve plate should be replaced. It is the number 14 on the pump parts diagram.
 
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Old 06-01-13, 06:35 PM
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Which is what I suggest 8 post ago and included a part diagram in the post.
 
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Old 06-01-13, 06:58 PM
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The part diagram is not the right one. It should be for an EC 89 air compressor.

Where is the reed valve like PJMax said to check?
 
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