No, because you would not rule out the ground wire being defective by bypassing it. Need to verify the plug first and go from there.

 

Thank you Dakota Traveler! Here is what I found and wasn’t expecting.

All with engine off.

- new relay 0 volts
- old relay 0 volts
- jumpered with a wire was 12.5 volts!!

Seems to indicate there isn’t a bad wire after the relay. But what is this telling me?

tks

 

Well you can read voltage but it may not be able to take a load (amperage). So with the compressor hooked up and relay jumped, the compressor does not run? Assuming no wiring issues, then the compressor has an issue. But to eliminate that possibility, I would try to run the compressor directly. Either remove it and hook up a 12v source or use a spare battery and some wires at the compressor to see if it will run directly.

 

With the relay jumped, should the compressor run without the engine running?

Either way, I tried jumping the compressor by connecting it to another cat battery and it did not run. Nothing. So, I’m guessing it can’t really be anything but a bad compressor.

If I’m correct on the above, I’m guessing I need to order a new compressor.

 

At face value, looks like a bad pump indeed. You could open up the cover plate. The only metal plate on it held by three screws. Once open you can inspect for connecting rod/piston damage, etc. You can even manipulate it by hand to spin it. The cover is sealed on, so you have to pry a bit to pop it off.

 

Ya, once off I think I’d like to take a close look at it. But I’m the short term I think I’ll just replace it. Really need to get the rig running.

I’ve read that getting to one of the screws holding the bracket on can be a bear to reach but I’ll take a look at YouTube and see what I can learn.

Any advice on what to get and where to get it? Guessing OEM is the way to go with this kind of thing but I see Lucky 8 has several “type” compressors to choose from. Took a quick look around and looks like prices range from $400 - 800 depending. But they do not come with a new mounting bracket and associated bits and pieces. This makes me wonder what should be replaced along with the actual compressor. Or if there are better options.

tks

 

The upper bolt holding the main mount is not that bad really, just need swivel and extensions.

And yes, OEM or equivalent is best. Arnott is fine too for compressors. But you may want to scoop this up if you can, Amazon are house. Lilley a return but labeled as "like new". $288 is a good price and since its Amazon, if its not up to par a return is silly easy. This will be a genuine Hitachi.

 

Thank you Dakota Traveler! Wouldn’t have got this far without you!

 

Got my new compressor. I removed my old compressor today by removing the whole bracket with compressor attached. But I ran into a couple issues.

The top rear air hose pulled out leaving the metal piece behind in the Voss fitting. After I got the compressor out, I tried to remove the metal piece and it would not budge. It’s kind of like the plastic from the hose melted into the fitting. The voss fitting itself is seized. Needless to say, I could not get the metal piece out. My guess is that I will need to get a new metal piece, snip off the mangled end of the remaining hose, and hope there is enough length left to fit a new metal piece into the hose and still be able to insert into the Voss fitting. So, where do I get a new metal piece and what is the best way of repairing the hose?

Secondly, I cannot imagine how I am going to get the top bolt of the bracket started. If I can get it started, I can used a ratcheting wrench to screw it in. But again how do I get it started? I’ve watched plenty of videos that show how to remove the bolt, but not how to reattach.

tks

 

Do you mean the larger diameter hoses? Those are not technically VOSS but simple push connectors. The outer plastic ring, usually black, gets pushed inward along with the hose. Then when all the way in (just a couple mm at most as you can see) then you hold the ring in place (down/in) and pull the hose. There is no ring. In fact all the air compressor fittings, including those on the dryer, are push connect.

With the brakes removed you can cut/grind a slit in it. That way you can start the bolt. Or just put grease in the socket to keep the bolt from falling out as you snake it into place.